253 lines
9.2 KiB
Java
253 lines
9.2 KiB
Java
/*
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* Copyright 2012 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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* http://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.channel;
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import io.netty.buffer.ByteBufAllocator;
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import io.netty.channel.socket.SocketChannelConfig;
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import java.nio.ByteBuffer;
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import java.nio.channels.WritableByteChannel;
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import java.util.Map;
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/**
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* A set of configuration properties of a {@link Channel}.
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* <p>
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* Please down-cast to more specific configuration type such as
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* {@link SocketChannelConfig} or use {@link #setOptions(Map)} to set the
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* transport-specific properties:
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* <pre>
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* {@link Channel} ch = ...;
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* {@link SocketChannelConfig} cfg = <strong>({@link SocketChannelConfig}) ch.getConfig();</strong>
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* cfg.setTcpNoDelay(false);
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* </pre>
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*
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* <h3>Option map</h3>
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*
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* An option map property is a dynamic write-only property which allows
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* the configuration of a {@link Channel} without down-casting its associated
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* {@link ChannelConfig}. To update an option map, please call {@link #setOptions(Map)}.
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* <p>
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* All {@link ChannelConfig} has the following options:
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*
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* <table border="1" cellspacing="0" cellpadding="6">
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* <tr>
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* <th>Name</th><th>Associated setter method</th>
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* </tr><tr>
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* <td>{@link ChannelOption#CONNECT_TIMEOUT_MILLIS}</td><td>{@link #setConnectTimeoutMillis(int)}</td>
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* </tr><tr>
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* <td>{@link ChannelOption#WRITE_SPIN_COUNT}</td><td>{@link #setWriteSpinCount(int)}</td>
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* </tr><tr>
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* <td>{@link ChannelOption#ALLOCATOR}</td><td>{@link #setAllocator(ByteBufAllocator)}</td>
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* </tr><tr>
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* <td>{@link ChannelOption#AUTO_READ}</td><td>{@link #setAutoRead(boolean)}</td>
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* </tr>
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* </table>
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* <p>
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* More options are available in the sub-types of {@link ChannelConfig}. For
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* example, you can configure the parameters which are specific to a TCP/IP
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* socket as explained in {@link SocketChannelConfig}.
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*/
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public interface ChannelConfig {
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/**
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* Return all set {@link ChannelOption}'s.
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*/
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Map<ChannelOption<?>, Object> getOptions();
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/**
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* Sets the configuration properties from the specified {@link Map}.
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*/
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boolean setOptions(Map<ChannelOption<?>, ?> options);
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/**
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* Return the value of the given {@link ChannelOption}
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*/
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<T> T getOption(ChannelOption<T> option);
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/**
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* Sets a configuration property with the specified name and value.
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* To override this method properly, you must call the super class:
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* <pre>
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* public boolean setOption(ChannelOption<T> option, T value) {
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* if (super.setOption(option, value)) {
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* return true;
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* }
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*
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* if (option.equals(additionalOption)) {
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* ....
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* return true;
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* }
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*
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* return false;
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* }
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* </pre>
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*
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* @return {@code true} if and only if the property has been set
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*/
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<T> boolean setOption(ChannelOption<T> option, T value);
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/**
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* Returns the connect timeout of the channel in milliseconds. If the
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* {@link Channel} does not support connect operation, this property is not
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* used at all, and therefore will be ignored.
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*
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* @return the connect timeout in milliseconds. {@code 0} if disabled.
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*/
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int getConnectTimeoutMillis();
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/**
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* Sets the connect timeout of the channel in milliseconds. If the
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* {@link Channel} does not support connect operation, this property is not
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* used at all, and therefore will be ignored.
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*
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* @param connectTimeoutMillis the connect timeout in milliseconds.
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* {@code 0} to disable.
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*/
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ChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis);
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/**
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* Returns the maximum number of messages to read per read loop.
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* a {@link ChannelInboundHandler#channelRead(ChannelHandlerContext, Object) channelRead()} event.
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* If this value is greater than 1, an event loop might attempt to read multiple times to procure multiple messages.
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*/
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int getMaxMessagesPerRead();
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/**
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* Sets the maximum number of messages to read per read loop.
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* If this value is greater than 1, an event loop might attempt to read multiple times to procure multiple messages.
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*/
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ChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead);
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/**
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* Returns the maximum loop count for a write operation until
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* {@link WritableByteChannel#write(ByteBuffer)} returns a non-zero value.
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* It is similar to what a spin lock is used for in concurrency programming.
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* It improves memory utilization and write throughput depending on
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* the platform that JVM runs on. The default value is {@code 16}.
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*/
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int getWriteSpinCount();
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/**
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* Sets the maximum loop count for a write operation until
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* {@link WritableByteChannel#write(ByteBuffer)} returns a non-zero value.
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* It is similar to what a spin lock is used for in concurrency programming.
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* It improves memory utilization and write throughput depending on
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* the platform that JVM runs on. The default value is {@code 16}.
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*
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* @throws IllegalArgumentException
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* if the specified value is {@code 0} or less than {@code 0}
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*/
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ChannelConfig setWriteSpinCount(int writeSpinCount);
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/**
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* Returns {@link ByteBufAllocator} which is used for the channel
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* to allocate buffers.
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*/
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ByteBufAllocator getAllocator();
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/**
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* Set the {@link ByteBufAllocator} which is used for the channel
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* to allocate buffers.
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*/
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ChannelConfig setAllocator(ByteBufAllocator allocator);
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/**
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* Returns {@link RecvByteBufAllocator} which is used for the channel
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* to allocate receive buffers.
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*/
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RecvByteBufAllocator getRecvByteBufAllocator();
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/**
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* Set the {@link ByteBufAllocator} which is used for the channel
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* to allocate receive buffers.
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*/
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ChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator);
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/**
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* Returns {@code true} if and only if {@link ChannelHandlerContext#read()} will be invoked automatically so that
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* a user application doesn't need to call it at all. The default value is {@code true}.
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*/
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boolean isAutoRead();
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/**
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* Sets if {@link ChannelHandlerContext#read()} will be invoked automatically so that a user application doesn't
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* need to call it at all. The default value is {@code true}.
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*/
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ChannelConfig setAutoRead(boolean autoRead);
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/**
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* @deprecated From version 5.0, {@link Channel} will not be closed on write failure.
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*
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* Returns {@code true} if and only if the {@link Channel} will be closed automatically and immediately on
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* write failure. The default is {@code false}.
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*/
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@Deprecated
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boolean isAutoClose();
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/**
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* @deprecated From version 5.0, {@link Channel} will not be closed on write failure.
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*
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* Sets whether the {@link Channel} should be closed automatically and immediately on write faillure.
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* The default is {@code false}.
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*/
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@Deprecated
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ChannelConfig setAutoClose(boolean autoClose);
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/**
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* Returns the high water mark of the write buffer. If the number of bytes
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* queued in the write buffer exceeds this value, {@link Channel#isWritable()}
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* will start to return {@code false}.
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*/
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int getWriteBufferHighWaterMark();
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/**
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* Sets the high water mark of the write buffer. If the number of bytes
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* queued in the write buffer exceeds this value, {@link Channel#isWritable()}
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* will start to return {@code false}.
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*/
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ChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark);
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/**
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* Returns the low water mark of the write buffer. Once the number of bytes
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* queued in the write buffer exceeded the
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* {@linkplain #setWriteBufferHighWaterMark(int) high water mark} and then
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* dropped down below this value, {@link Channel#isWritable()} will start to return
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* {@code true} again.
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*/
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int getWriteBufferLowWaterMark();
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/**
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* Sets the low water mark of the write buffer. Once the number of bytes
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* queued in the write buffer exceeded the
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* {@linkplain #setWriteBufferHighWaterMark(int) high water mark} and then
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* dropped down below this value, {@link Channel#isWritable()} will start to return
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* {@code true} again.
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*/
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ChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark);
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/**
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* Returns {@link MessageSizeEstimator} which is used for the channel
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* to detect the size of a message.
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*/
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MessageSizeEstimator getMessageSizeEstimator();
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/**
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* Set the {@link ByteBufAllocator} which is used for the channel
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* to detect the size of a message.
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*/
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ChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator);
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}
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