134 lines
4.7 KiB
Java
134 lines
4.7 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.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>{@code "connectTimeoutMillis"}</td><td>{@link #setConnectTimeoutMillis(int)}</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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* @apiviz.has io.netty.channel.ChannelPipelineFactory
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* @apiviz.composedOf io.netty.channel.ReceiveBufferSizePredictor
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*
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* @apiviz.excludeSubtypes
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*/
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public interface ChannelConfig {
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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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<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(String name, Object value) {
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* if (super.setOption(name, value)) {
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* return true;
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* }
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*
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* if (name.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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void setConnectTimeoutMillis(int connectTimeoutMillis);
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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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void setWriteSpinCount(int writeSpinCount);
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}
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