SessionRequestImpl.java

/*
 * Licensed 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 com.ok2c.lightnio.impl;

import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.Channel;
import java.nio.channels.SelectionKey;

import com.ok2c.lightnio.IOSession;
import com.ok2c.lightnio.SessionRequest;
import com.ok2c.lightnio.SessionRequestCallback;

/**
 * Default implementation of {@link SessionRequest}.
 */
public class SessionRequestImpl implements SessionRequest {

    private volatile boolean completed;
    private volatile SelectionKey key;

    private final SocketAddress remoteAddress;
    private final SocketAddress localAddress;
    private final Object attachment;
    private final SessionRequestCallback callback;

    private volatile int connectTimeout;
    private volatile IOSession session = null;
    private volatile IOException exception = null;

    public SessionRequestImpl(
            final SocketAddress remoteAddress,
            final SocketAddress localAddress,
            final Object attachment,
            final SessionRequestCallback callback) {
        super();
        if (remoteAddress == null) {
            throw new IllegalArgumentException("Remote address may not be null");
        }
        this.remoteAddress = remoteAddress;
        this.localAddress = localAddress;
        this.attachment = attachment;
        this.callback = callback;
        this.connectTimeout = 0;
    }

    public SocketAddress getRemoteAddress() {
        return this.remoteAddress;
    }

    public SocketAddress getLocalAddress() {
        return this.localAddress;
    }

    public Object getAttachment() {
        return this.attachment;
    }

    public boolean isCompleted() {
        return this.completed;
    }

    public void waitFor() throws InterruptedException {
        if (this.completed) {
            return;
        }
        synchronized (this) {
            while (!this.completed) {
                wait();
            }
        }
    }

    public IOSession getSession() {
        synchronized (this) {
            return this.session;
        }
    }

    public IOException getException() {
        synchronized (this) {
            return this.exception;
        }
    }

    public void completed(final IOSession session) {
        if (session == null) {
            throw new IllegalArgumentException("Session may not be null");
        }
        if (this.completed) {
            return;
        }
        this.completed = true;
        synchronized (this) {
            this.session = session;
            if (this.callback != null) {
                this.callback.completed(this);
            }
            notifyAll();
        }
    }

    public void failed(final IOException exception) {
        if (exception == null) {
            return;
        }
        if (this.completed) {
            return;
        }
        this.completed = true;
        synchronized (this) {
            this.exception = exception;
            if (this.callback != null) {
                this.callback.failed(this);
            }
            notifyAll();
        }
    }

    public void timeout() {
        if (this.completed) {
            return;
        }
        this.completed = true;
        if (this.key != null) {
            this.key.cancel();
            Channel channel = this.key.channel();
            if (channel.isOpen()) {
                try {
                    channel.close();
                } catch (IOException ignore) {}
            }
        }
        synchronized (this) {
            if (this.callback != null) {
                this.callback.timeout(this);
            }
        }
    }

    public int getConnectTimeout() {
        return this.connectTimeout;
    }

    public void setConnectTimeout(int timeout) {
        if (this.connectTimeout != timeout) {
            this.connectTimeout = timeout;
            if (this.key != null) {
                this.key.selector().wakeup();
            }
        }
    }

    protected void setKey(final SelectionKey key) {
        this.key = key;
    }

    public void cancel() {
        if (this.completed) {
            return;
        }
        this.completed = true;
        if (this.key != null) {
            this.key.cancel();
            Channel channel = this.key.channel();
            if (channel.isOpen()) {
                try {
                    channel.close();
                } catch (IOException ignore) {}
            }
        }
        synchronized (this) {
            if (this.callback != null) {
                this.callback.cancelled(this);
            }
            notifyAll();
        }
    }

}