org.apache.mina.springrpc.DefaultMinaRequestExecutor.java Source code

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Here is the source code for org.apache.mina.springrpc.DefaultMinaRequestExecutor.java

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/*
 * Copyright 2008-2013 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.apache.mina.springrpc;

import java.net.InetSocketAddress;
import java.net.SocketException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.core.future.WriteFuture;
import org.apache.mina.core.service.IoConnector;
import org.apache.mina.core.session.IoSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

/**
 * 
 * @author politics wang
 * @since 2008-11-25
 */
public class DefaultMinaRequestExecutor implements MinaRequestExecutor {

    private static Logger logger = LoggerFactory.getLogger(DefaultMinaRequestExecutor.class);

    public static final long DEFAULT_RECOVERY_INTERVAL = 3000L;

    private IoConnector connector;

    private IoSession session;

    private MinaClientConfiguration configuration;

    private ResultReceiver resultReceiver;

    private Lock lock = new ReentrantLock();

    private long recoveryInterval = DEFAULT_RECOVERY_INTERVAL;

    private AtomicBoolean running = new AtomicBoolean(true);

    private AtomicBoolean connected = new AtomicBoolean(false);

    @Override
    public ReturnAddressAwareRemoteInvocationResult executeRequest(ReturnAddressAwareRemoteInvocation invocation)
            throws Exception {

        if (!isConnected()) {
            return handleDisconnected(invocation);
        }

        WriteFuture writeFuture = session.write(invocation);
        writeFuture.awaitUninterruptibly();
        return resultReceiver.takeResult(invocation.getReturnAddress());
    }

    private ReturnAddressAwareRemoteInvocationResult handleDisconnected(
            ReturnAddressAwareRemoteInvocation invocation) {
        Exception e = new SocketException("Client disconnected");
        return new ReturnAddressAwareRemoteInvocationResult(invocation.getReturnAddress(), e);
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Assert.notNull(connector, "connector required");
        Assert.notNull(resultReceiver, "resultReceiver required");
        initialize();
    }

    public void initialize() {
        connector.setHandler(new MinaClientHandler(resultReceiver, this));
        connect();
    }

    @Override
    public void connect() {
        lock.lock();
        while (isRunning()) {
            resultReceiver.interrupt();
            try {
                ConnectFuture future = connector.connect(getAddress());
                future.awaitUninterruptibly();
                session = future.getSession();
                connected.set(true);
                logger.info("Successfully connect to " + getAddress());
                break;
            } catch (Exception e) {
                connected.set(false);
                logger.error("Couldn't connect to " + getAddress() + e.getMessage() + ", retrying in "
                        + recoveryInterval + " ms", e);
            }

            sleepInbetweenRecoveryAttempts();
        }
        lock.unlock();
    }

    @Override
    public boolean isRunning() {
        return running.get();
    }

    private boolean isConnected() {
        return connected.get();
    }

    /**
     * Sleep according to the specified recovery interval.
     * Called inbetween recovery attempts.
     */
    protected void sleepInbetweenRecoveryAttempts() {
        if (this.recoveryInterval > 0) {
            try {
                Thread.sleep(this.recoveryInterval);
            } catch (InterruptedException interEx) {
                // Re-interrupt current thread, to allow other threads to react.
                Thread.currentThread().interrupt();
            }
        }
    }

    private InetSocketAddress getAddress() {
        return new InetSocketAddress(configuration.getHostName(), configuration.getPort());
    }

    @Override
    public void destroy() throws Exception {
        //      lock.lock();
        running.set(false);
        connected.set(false);
        session.close(true);
        connector.dispose();
        //      lock.unlock();
    }

    @Override
    public void setMinaClientConfiguration(MinaClientConfiguration configuration) {
        this.configuration = configuration;
    }

    public void setResultReceiver(ResultReceiver resultReceiver) {
        this.resultReceiver = resultReceiver;
    }

    public void setConnector(IoConnector connector) {
        this.connector = connector;
    }

    public void setRecoveryInterval(long recoveryInterval) {
        this.recoveryInterval = recoveryInterval;
    }

}