0cb4cc4e49
Motivation: We wish to separate these two into clearer write/read interfaces. In particular, we don't want to be able to add listeners to promises, because it makes it easy to add them out of order. We can't prevent it entirely, because any promise can be freely converted to a future where listeners can be added. We can, however, discourage this in the API. Modification: The Promise interface no longer extends the Future interface. Numerous changes to make the project compile and its tests run. Result: Clearer separation of concerns in the code.
661 lines
24 KiB
Java
661 lines
24 KiB
Java
/*
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* Copyright 2011 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.traffic;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufConvertible;
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import io.netty.buffer.ByteBufHolder;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelConfig;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelOutboundBuffer;
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import io.netty.channel.FileRegion;
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import io.netty.util.Attribute;
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import io.netty.util.AttributeKey;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.Promise;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.util.concurrent.TimeUnit;
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import static io.netty.util.internal.ObjectUtil.checkPositive;
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/**
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* <p>AbstractTrafficShapingHandler allows to limit the global bandwidth
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* (see {@link GlobalTrafficShapingHandler}) or per session
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* bandwidth (see {@link ChannelTrafficShapingHandler}), as traffic shaping.
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* It allows you to implement an almost real time monitoring of the bandwidth using
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* the monitors from {@link TrafficCounter} that will call back every checkInterval
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* the method doAccounting of this handler.</p>
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*
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* <p>If you want for any particular reasons to stop the monitoring (accounting) or to change
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* the read/write limit or the check interval, several methods allow that for you:</p>
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* <ul>
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* <li><tt>configure</tt> allows you to change read or write limits, or the checkInterval</li>
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* <li><tt>getTrafficCounter</tt> allows you to have access to the TrafficCounter and so to stop
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* or start the monitoring, to change the checkInterval directly, or to have access to its values.</li>
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* </ul>
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*/
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public abstract class AbstractTrafficShapingHandler implements ChannelHandler {
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private static final InternalLogger logger =
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InternalLoggerFactory.getInstance(AbstractTrafficShapingHandler.class);
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/**
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* Default delay between two checks: 1s
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*/
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public static final long DEFAULT_CHECK_INTERVAL = 1000;
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/**
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* Default max delay in case of traffic shaping
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* (during which no communication will occur).
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* Shall be less than TIMEOUT. Here half of "standard" 30s
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*/
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public static final long DEFAULT_MAX_TIME = 15000;
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/**
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* Default max size to not exceed in buffer (write only).
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*/
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static final long DEFAULT_MAX_SIZE = 4 * 1024 * 1024L;
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/**
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* Default minimal time to wait: 10ms
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*/
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static final long MINIMAL_WAIT = 10;
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/**
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* Traffic Counter
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*/
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protected TrafficCounter trafficCounter;
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/**
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* Limit in B/s to apply to write
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*/
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private volatile long writeLimit;
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/**
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* Limit in B/s to apply to read
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*/
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private volatile long readLimit;
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/**
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* Max delay in wait
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*/
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protected volatile long maxTime = DEFAULT_MAX_TIME; // default 15 s
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/**
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* Delay between two performance snapshots
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*/
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protected volatile long checkInterval = DEFAULT_CHECK_INTERVAL; // default 1 s
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static final AttributeKey<Boolean> READ_SUSPENDED = AttributeKey
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.valueOf(AbstractTrafficShapingHandler.class.getName() + ".READ_SUSPENDED");
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static final AttributeKey<Runnable> REOPEN_TASK = AttributeKey.valueOf(AbstractTrafficShapingHandler.class
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.getName() + ".REOPEN_TASK");
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/**
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* Max time to delay before proposing to stop writing new objects from next handlers
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*/
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volatile long maxWriteDelay = 4 * DEFAULT_CHECK_INTERVAL; // default 4 s
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/**
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* Max size in the list before proposing to stop writing new objects from next handlers
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*/
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volatile long maxWriteSize = DEFAULT_MAX_SIZE; // default 4MB
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/**
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* Rank in UserDefinedWritability (1 for Channel, 2 for Global TrafficShapingHandler).
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* Set in final constructor. Must be between 1 and 31
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*/
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final int userDefinedWritabilityIndex;
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/**
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* Default value for Channel UserDefinedWritability index
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*/
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static final int CHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX = 1;
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/**
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* Default value for Global UserDefinedWritability index
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*/
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static final int GLOBAL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX = 2;
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/**
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* Default value for GlobalChannel UserDefinedWritability index
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*/
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static final int GLOBALCHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX = 3;
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/**
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* @param newTrafficCounter
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* the TrafficCounter to set
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*/
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void setTrafficCounter(TrafficCounter newTrafficCounter) {
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trafficCounter = newTrafficCounter;
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}
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/**
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* @return the index to be used by the TrafficShapingHandler to manage the user defined writability.
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* For Channel TSH it is defined as {@value #CHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX},
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* for Global TSH it is defined as {@value #GLOBAL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX},
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* for GlobalChannel TSH it is defined as
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* {@value #GLOBALCHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX}.
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*/
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protected int userDefinedWritabilityIndex() {
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return CHANNEL_DEFAULT_USER_DEFINED_WRITABILITY_INDEX;
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}
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/**
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* @param writeLimit
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* 0 or a limit in bytes/s
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* @param readLimit
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* 0 or a limit in bytes/s
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* @param checkInterval
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* The delay between two computations of performances for
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* channels or 0 if no stats are to be computed.
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* @param maxTime
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* The maximum delay to wait in case of traffic excess.
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* Must be positive.
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*/
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protected AbstractTrafficShapingHandler(long writeLimit, long readLimit, long checkInterval, long maxTime) {
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this.maxTime = checkPositive(maxTime, "maxTime");
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userDefinedWritabilityIndex = userDefinedWritabilityIndex();
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this.writeLimit = writeLimit;
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this.readLimit = readLimit;
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this.checkInterval = checkInterval;
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}
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/**
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* Constructor using default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
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* @param writeLimit
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* 0 or a limit in bytes/s
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* @param readLimit
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* 0 or a limit in bytes/s
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* @param checkInterval
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* The delay between two computations of performances for
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* channels or 0 if no stats are to be computed.
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*/
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protected AbstractTrafficShapingHandler(long writeLimit, long readLimit, long checkInterval) {
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this(writeLimit, readLimit, checkInterval, DEFAULT_MAX_TIME);
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}
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/**
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* Constructor using default Check Interval value of {@value #DEFAULT_CHECK_INTERVAL} ms and
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* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
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*
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* @param writeLimit
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* 0 or a limit in bytes/s
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* @param readLimit
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* 0 or a limit in bytes/s
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*/
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protected AbstractTrafficShapingHandler(long writeLimit, long readLimit) {
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this(writeLimit, readLimit, DEFAULT_CHECK_INTERVAL, DEFAULT_MAX_TIME);
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}
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/**
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* Constructor using NO LIMIT, default Check Interval value of {@value #DEFAULT_CHECK_INTERVAL} ms and
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* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
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*/
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protected AbstractTrafficShapingHandler() {
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this(0, 0, DEFAULT_CHECK_INTERVAL, DEFAULT_MAX_TIME);
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}
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/**
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* Constructor using NO LIMIT and
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* default max time as delay allowed value of {@value #DEFAULT_MAX_TIME} ms.
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*
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* @param checkInterval
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* The delay between two computations of performances for
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* channels or 0 if no stats are to be computed.
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*/
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protected AbstractTrafficShapingHandler(long checkInterval) {
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this(0, 0, checkInterval, DEFAULT_MAX_TIME);
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}
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/**
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* Change the underlying limitations and check interval.
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* <p>Note the change will be taken as best effort, meaning
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* that all already scheduled traffics will not be
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* changed, but only applied to new traffics.</p>
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* <p>So the expected usage of this method is to be used not too often,
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* accordingly to the traffic shaping configuration.</p>
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*
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* @param newWriteLimit The new write limit (in bytes)
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* @param newReadLimit The new read limit (in bytes)
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* @param newCheckInterval The new check interval (in milliseconds)
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*/
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public void configure(long newWriteLimit, long newReadLimit,
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long newCheckInterval) {
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configure(newWriteLimit, newReadLimit);
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configure(newCheckInterval);
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}
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/**
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* Change the underlying limitations.
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* <p>Note the change will be taken as best effort, meaning
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* that all already scheduled traffics will not be
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* changed, but only applied to new traffics.</p>
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* <p>So the expected usage of this method is to be used not too often,
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* accordingly to the traffic shaping configuration.</p>
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*
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* @param newWriteLimit The new write limit (in bytes)
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* @param newReadLimit The new read limit (in bytes)
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*/
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public void configure(long newWriteLimit, long newReadLimit) {
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writeLimit = newWriteLimit;
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readLimit = newReadLimit;
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if (trafficCounter != null) {
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trafficCounter.resetAccounting(TrafficCounter.milliSecondFromNano());
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}
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}
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/**
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* Change the check interval.
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*
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* @param newCheckInterval The new check interval (in milliseconds)
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*/
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public void configure(long newCheckInterval) {
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checkInterval = newCheckInterval;
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if (trafficCounter != null) {
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trafficCounter.configure(checkInterval);
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}
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}
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/**
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* @return the writeLimit
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*/
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public long getWriteLimit() {
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return writeLimit;
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}
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/**
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* <p>Note the change will be taken as best effort, meaning
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* that all already scheduled traffics will not be
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* changed, but only applied to new traffics.</p>
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* <p>So the expected usage of this method is to be used not too often,
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* accordingly to the traffic shaping configuration.</p>
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*
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* @param writeLimit the writeLimit to set
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*/
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public void setWriteLimit(long writeLimit) {
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this.writeLimit = writeLimit;
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if (trafficCounter != null) {
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trafficCounter.resetAccounting(TrafficCounter.milliSecondFromNano());
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}
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}
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/**
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* @return the readLimit
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*/
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public long getReadLimit() {
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return readLimit;
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}
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/**
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* <p>Note the change will be taken as best effort, meaning
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* that all already scheduled traffics will not be
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* changed, but only applied to new traffics.</p>
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* <p>So the expected usage of this method is to be used not too often,
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* accordingly to the traffic shaping configuration.</p>
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*
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* @param readLimit the readLimit to set
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*/
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public void setReadLimit(long readLimit) {
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this.readLimit = readLimit;
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if (trafficCounter != null) {
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trafficCounter.resetAccounting(TrafficCounter.milliSecondFromNano());
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}
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}
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/**
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* @return the checkInterval
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*/
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public long getCheckInterval() {
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return checkInterval;
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}
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/**
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* @param checkInterval the interval in ms between each step check to set, default value being 1000 ms.
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*/
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public void setCheckInterval(long checkInterval) {
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this.checkInterval = checkInterval;
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if (trafficCounter != null) {
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trafficCounter.configure(checkInterval);
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}
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}
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/**
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* <p>Note the change will be taken as best effort, meaning
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* that all already scheduled traffics will not be
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* changed, but only applied to new traffics.</p>
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* <p>So the expected usage of this method is to be used not too often,
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* accordingly to the traffic shaping configuration.</p>
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*
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* @param maxTime
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* Max delay in wait, shall be less than TIME OUT in related protocol.
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* Must be positive.
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*/
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public void setMaxTimeWait(long maxTime) {
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this.maxTime = checkPositive(maxTime, "maxTime");
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}
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/**
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* @return the max delay in wait to prevent TIME OUT
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*/
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public long getMaxTimeWait() {
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return maxTime;
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}
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/**
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* @return the maxWriteDelay
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*/
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public long getMaxWriteDelay() {
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return maxWriteDelay;
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}
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/**
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* <p>Note the change will be taken as best effort, meaning
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* that all already scheduled traffics will not be
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* changed, but only applied to new traffics.</p>
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* <p>So the expected usage of this method is to be used not too often,
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* accordingly to the traffic shaping configuration.</p>
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*
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* @param maxWriteDelay the maximum Write Delay in ms in the buffer allowed before write suspension is set.
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* Must be positive.
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*/
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public void setMaxWriteDelay(long maxWriteDelay) {
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this.maxWriteDelay = checkPositive(maxWriteDelay, "maxWriteDelay");
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}
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/**
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* @return the maxWriteSize default being {@value #DEFAULT_MAX_SIZE} bytes.
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*/
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public long getMaxWriteSize() {
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return maxWriteSize;
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}
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/**
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* <p>Note that this limit is a best effort on memory limitation to prevent Out Of
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* Memory Exception. To ensure it works, the handler generating the write should
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* use one of the way provided by Netty to handle the capacity:</p>
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* <p>- the {@code Channel.isWritable()} property and the corresponding
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* {@code channelWritabilityChanged()}</p>
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* <p>- the {@code Future.addListener(future -> ...)}</p>
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*
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* @param maxWriteSize the maximum Write Size allowed in the buffer
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* per channel before write suspended is set,
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* default being {@value #DEFAULT_MAX_SIZE} bytes.
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*/
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public void setMaxWriteSize(long maxWriteSize) {
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this.maxWriteSize = maxWriteSize;
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}
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/**
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* Called each time the accounting is computed from the TrafficCounters.
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* This method could be used for instance to implement almost real time accounting.
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*
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* @param counter
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* the TrafficCounter that computes its performance
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*/
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protected void doAccounting(TrafficCounter counter) {
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// NOOP by default
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}
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/**
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* Class to implement setReadable at fix time
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*/
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static final class ReopenReadTimerTask implements Runnable {
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final ChannelHandlerContext ctx;
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ReopenReadTimerTask(ChannelHandlerContext ctx) {
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this.ctx = ctx;
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}
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@Override
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public void run() {
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Channel channel = ctx.channel();
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ChannelConfig config = channel.config();
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if (!config.isAutoRead() && isHandlerActive(ctx)) {
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// If AutoRead is False and Active is True, user make a direct setAutoRead(false)
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// Then Just reset the status
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if (logger.isDebugEnabled()) {
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logger.debug("Not unsuspend: " + config.isAutoRead() + ':' +
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isHandlerActive(ctx));
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}
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channel.attr(READ_SUSPENDED).set(false);
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} else {
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// Anything else allows the handler to reset the AutoRead
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if (logger.isDebugEnabled()) {
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if (config.isAutoRead() && !isHandlerActive(ctx)) {
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if (logger.isDebugEnabled()) {
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logger.debug("Unsuspend: " + config.isAutoRead() + ':' +
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isHandlerActive(ctx));
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}
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} else {
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if (logger.isDebugEnabled()) {
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logger.debug("Normal unsuspend: " + config.isAutoRead() + ':'
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+ isHandlerActive(ctx));
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}
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}
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}
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channel.attr(READ_SUSPENDED).set(false);
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config.setAutoRead(true);
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channel.read();
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}
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if (logger.isDebugEnabled()) {
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logger.debug("Unsuspend final status => " + config.isAutoRead() + ':'
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+ isHandlerActive(ctx));
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}
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}
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}
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/**
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* Release the Read suspension
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*/
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void releaseReadSuspended(ChannelHandlerContext ctx) {
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Channel channel = ctx.channel();
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channel.attr(READ_SUSPENDED).set(false);
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channel.config().setAutoRead(true);
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}
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@Override
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public void channelRead(final ChannelHandlerContext ctx, final Object msg) throws Exception {
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long size = calculateSize(msg);
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long now = TrafficCounter.milliSecondFromNano();
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if (size > 0) {
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// compute the number of ms to wait before reopening the channel
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long wait = trafficCounter.readTimeToWait(size, readLimit, maxTime, now);
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wait = checkWaitReadTime(ctx, wait, now);
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if (wait >= MINIMAL_WAIT) { // At least 10ms seems a minimal
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// time in order to try to limit the traffic
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// Only AutoRead AND HandlerActive True means Context Active
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Channel channel = ctx.channel();
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ChannelConfig config = channel.config();
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if (logger.isDebugEnabled()) {
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logger.debug("Read suspend: " + wait + ':' + config.isAutoRead() + ':'
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+ isHandlerActive(ctx));
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}
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if (config.isAutoRead() && isHandlerActive(ctx)) {
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config.setAutoRead(false);
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channel.attr(READ_SUSPENDED).set(true);
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// Create a Runnable to reactive the read if needed. If one was create before it will just be
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// reused to limit object creation
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Attribute<Runnable> attr = channel.attr(REOPEN_TASK);
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Runnable reopenTask = attr.get();
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if (reopenTask == null) {
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reopenTask = new ReopenReadTimerTask(ctx);
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attr.set(reopenTask);
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}
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ctx.executor().schedule(reopenTask, wait, TimeUnit.MILLISECONDS);
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if (logger.isDebugEnabled()) {
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logger.debug("Suspend final status => " + config.isAutoRead() + ':'
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+ isHandlerActive(ctx) + " will reopened at: " + wait);
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}
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}
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}
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}
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informReadOperation(ctx, now);
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ctx.fireChannelRead(msg);
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}
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@Override
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public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
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Channel channel = ctx.channel();
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if (channel.hasAttr(REOPEN_TASK)) {
|
|
//release the reopen task
|
|
channel.attr(REOPEN_TASK).set(null);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Method overridden in GTSH to take into account specific timer for the channel.
|
|
* @param wait the wait delay computed in ms
|
|
* @param now the relative now time in ms
|
|
* @return the wait to use according to the context
|
|
*/
|
|
long checkWaitReadTime(final ChannelHandlerContext ctx, long wait, final long now) {
|
|
// no change by default
|
|
return wait;
|
|
}
|
|
|
|
/**
|
|
* Method overridden in GTSH to take into account specific timer for the channel.
|
|
* @param now the relative now time in ms
|
|
*/
|
|
void informReadOperation(final ChannelHandlerContext ctx, final long now) {
|
|
// default noop
|
|
}
|
|
|
|
protected static boolean isHandlerActive(ChannelHandlerContext ctx) {
|
|
Boolean suspended = ctx.channel().attr(READ_SUSPENDED).get();
|
|
return suspended == null || Boolean.FALSE.equals(suspended);
|
|
}
|
|
|
|
@Override
|
|
public void read(ChannelHandlerContext ctx) {
|
|
if (isHandlerActive(ctx)) {
|
|
// For Global Traffic (and Read when using EventLoop in pipeline) : check if READ_SUSPENDED is False
|
|
ctx.read();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public Future<Void> write(final ChannelHandlerContext ctx, final Object msg) {
|
|
long size = calculateSize(msg);
|
|
long now = TrafficCounter.milliSecondFromNano();
|
|
Promise<Void> promise = ctx.newPromise();
|
|
if (size > 0) {
|
|
// compute the number of ms to wait before continue with the channel
|
|
long wait = trafficCounter.writeTimeToWait(size, writeLimit, maxTime, now);
|
|
if (wait >= MINIMAL_WAIT) {
|
|
if (logger.isDebugEnabled()) {
|
|
logger.debug("Write suspend: " + wait + ':' + ctx.channel().config().isAutoRead() + ':'
|
|
+ isHandlerActive(ctx));
|
|
}
|
|
submitWrite(ctx, msg, size, wait, now, promise);
|
|
return promise.asFuture();
|
|
}
|
|
}
|
|
// to maintain order of write
|
|
submitWrite(ctx, msg, size, 0, now, promise);
|
|
return promise.asFuture();
|
|
}
|
|
|
|
@Deprecated
|
|
protected void submitWrite(final ChannelHandlerContext ctx, final Object msg,
|
|
final long delay, final Promise<Void> promise) {
|
|
submitWrite(ctx, msg, calculateSize(msg),
|
|
delay, TrafficCounter.milliSecondFromNano(), promise);
|
|
}
|
|
|
|
abstract void submitWrite(
|
|
ChannelHandlerContext ctx, Object msg, long size, long delay, long now, Promise<Void> promise);
|
|
|
|
@Override
|
|
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
|
|
setUserDefinedWritability(ctx, true);
|
|
ctx.fireChannelRegistered();
|
|
}
|
|
|
|
void setUserDefinedWritability(ChannelHandlerContext ctx, boolean writable) {
|
|
ChannelOutboundBuffer cob = ctx.channel().unsafe().outboundBuffer();
|
|
if (cob != null) {
|
|
cob.setUserDefinedWritability(userDefinedWritabilityIndex, writable);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check the writability according to delay and size for the channel.
|
|
* Set if necessary setUserDefinedWritability status.
|
|
* @param delay the computed delay
|
|
* @param queueSize the current queueSize
|
|
*/
|
|
void checkWriteSuspend(ChannelHandlerContext ctx, long delay, long queueSize) {
|
|
if (queueSize > maxWriteSize || delay > maxWriteDelay) {
|
|
setUserDefinedWritability(ctx, false);
|
|
}
|
|
}
|
|
/**
|
|
* Explicitly release the Write suspended status.
|
|
*/
|
|
void releaseWriteSuspended(ChannelHandlerContext ctx) {
|
|
setUserDefinedWritability(ctx, true);
|
|
}
|
|
|
|
/**
|
|
* @return the current TrafficCounter (if
|
|
* channel is still connected)
|
|
*/
|
|
public TrafficCounter trafficCounter() {
|
|
return trafficCounter;
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
StringBuilder builder = new StringBuilder(290)
|
|
.append("TrafficShaping with Write Limit: ").append(writeLimit)
|
|
.append(" Read Limit: ").append(readLimit)
|
|
.append(" CheckInterval: ").append(checkInterval)
|
|
.append(" maxDelay: ").append(maxWriteDelay)
|
|
.append(" maxSize: ").append(maxWriteSize)
|
|
.append(" and Counter: ");
|
|
if (trafficCounter != null) {
|
|
builder.append(trafficCounter);
|
|
} else {
|
|
builder.append("none");
|
|
}
|
|
return builder.toString();
|
|
}
|
|
|
|
/**
|
|
* Calculate the size of the given {@link Object}.
|
|
*
|
|
* This implementation supports {@link ByteBuf}, {@link ByteBufHolder} and {@link FileRegion}.
|
|
* Sub-classes may override this.
|
|
* @param msg the msg for which the size should be calculated.
|
|
* @return size the size of the msg or {@code -1} if unknown.
|
|
*/
|
|
protected long calculateSize(Object msg) {
|
|
if (msg instanceof ByteBufConvertible) {
|
|
return ((ByteBufConvertible) msg).asByteBuf().readableBytes();
|
|
}
|
|
if (msg instanceof ByteBufHolder) {
|
|
return ((ByteBufHolder) msg).content().readableBytes();
|
|
}
|
|
if (msg instanceof FileRegion) {
|
|
return ((FileRegion) msg).count();
|
|
}
|
|
return -1;
|
|
}
|
|
}
|