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Java example source code file (DefaultAddressedEnvelope.java)

This example Java source code file (DefaultAddressedEnvelope.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

addressedenvelope, defaultaddressedenvelope, net, network, nullpointerexception, override, referencecounted, socketaddress, string

The DefaultAddressedEnvelope.java Java example source code

/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package io.netty.channel;

import io.netty.util.ReferenceCountUtil;
import io.netty.util.ReferenceCounted;
import io.netty.util.internal.StringUtil;

import java.net.SocketAddress;

/**
 * The default {@link AddressedEnvelope} implementation.
 *
 * @param <M> the type of the wrapped message
 * @param <A> the type of the recipient address
 */
public class DefaultAddressedEnvelope<M, A extends SocketAddress> implements AddressedEnvelope {

    private final M message;
    private final A sender;
    private final A recipient;

    /**
     * Creates a new instance with the specified {@code message}, {@code recipient} address, and
     * {@code sender} address.
     */
    public DefaultAddressedEnvelope(M message, A recipient, A sender) {
        if (message == null) {
            throw new NullPointerException("message");
        }

        if (recipient == null && sender == null) {
            throw new NullPointerException("recipient and sender");
        }

        this.message = message;
        this.sender = sender;
        this.recipient = recipient;
    }

    /**
     * Creates a new instance with the specified {@code message} and {@code recipient} address.
     * The sender address becomes {@code null}.
     */
    public DefaultAddressedEnvelope(M message, A recipient) {
        this(message, recipient, null);
    }

    @Override
    public M content() {
        return message;
    }

    @Override
    public A sender() {
        return sender;
    }

    @Override
    public A recipient() {
        return recipient;
    }

    @Override
    public int refCnt() {
        if (message instanceof ReferenceCounted) {
            return ((ReferenceCounted) message).refCnt();
        } else {
            return 1;
        }
    }

    @Override
    public AddressedEnvelope<M, A> retain() {
        ReferenceCountUtil.retain(message);
        return this;
    }

    @Override
    public AddressedEnvelope<M, A> retain(int increment) {
        ReferenceCountUtil.retain(message, increment);
        return this;
    }

    @Override
    public boolean release() {
        return ReferenceCountUtil.release(message);
    }

    @Override
    public boolean release(int decrement) {
        return ReferenceCountUtil.release(message, decrement);
    }

    @Override
    public AddressedEnvelope<M, A> touch() {
        ReferenceCountUtil.touch(message);
        return this;
    }

    @Override
    public AddressedEnvelope<M, A> touch(Object hint) {
        ReferenceCountUtil.touch(message, hint);
        return this;
    }

    @Override
    public String toString() {
        if (sender != null) {
            return StringUtil.simpleClassName(this) +
                    '(' + sender + " => " + recipient + ", " + message + ')';
        } else {
            return StringUtil.simpleClassName(this) +
                    "(=> " + recipient + ", " + message + ')';
        }
    }
}

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