org.cloudfoundry.caldecott.client.SocketClient.java Source code

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Here is the source code for org.cloudfoundry.caldecott.client.SocketClient.java

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/*
 * Copyright 2009-2012 the original author or authors.
 *
 * 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 org.cloudfoundry.caldecott.client;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.cloudfoundry.caldecott.TunnelException;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.util.Arrays;

/**
 * The Socket implementation of a Client designed to interact with data access clients.
 *
 * @author Thomas Risberg
 */
public class SocketClient implements Client {

    private static final int SOCKET_TIMEOUT = 30000;

    private static final int BUFFER_SIZE = 1024 * 1024;

    protected final Log logger = LogFactory.getLog(getClass());

    // configuration options for the socket
    private final Socket socket;

    // variables to keep track of communication state with the client
    // these are volatile since they will we checked by other threads
    // and open could be altered by another thread via forceCLose()
    private volatile boolean open = true;
    private volatile boolean idle = false;

    public SocketClient(Socket socket) {
        this.socket = socket;
        try {
            this.socket.setSoTimeout(SOCKET_TIMEOUT);
        } catch (SocketException e) {
            throw new TunnelException("Unable to set timeout on socket " + e.getMessage());
        }
    }

    public byte[] read() throws IOException {
        if (!open) {
            return null;
        }
        byte[] bytes = new byte[BUFFER_SIZE];
        int len;
        try {
            len = socket.getInputStream().read(bytes);
            idle = false;
        } catch (SocketTimeoutException e) {
            len = 0;
            if (logger.isTraceEnabled()) {
                logger.trace("Timeout on read " + e);
            }
            idle = true;
        }
        if (len < 0) {
            if (len < 0) {
                if (logger.isDebugEnabled()) {
                    logger.debug("[" + len + "] detected closed stream");
                }
                open = false;
            }
            len = 0;
        } else {
            if (logger.isTraceEnabled() && len > 0) {
                logger.trace("[" + len + " bytes] read from stream");
            }
        }
        return Arrays.copyOfRange(bytes, 0, len);
    }

    public void write(byte[] data) throws IOException {
        if (!open) {
            return;
        }
        idle = false;
        OutputStream s = socket.getOutputStream();
        s.write(data);
        s.flush();
        if (logger.isTraceEnabled()) {
            logger.trace("[" + data.length + " bytes] written to stream");
        }
    }

    public boolean isOpen() {
        return open;
    }

    public boolean isIdle() {
        return idle;
    }

    public void forceClose() {
        logger.debug("Force close requested for " + this);
        open = false;
    }

}