org.springframework.boot.devtools.tunnel.server.SocketTargetServerConnection.java Source code

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Here is the source code for org.springframework.boot.devtools.tunnel.server.SocketTargetServerConnection.java

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/*
 * Copyright 2012-2015 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.springframework.boot.devtools.tunnel.server;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ByteChannel;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SocketChannel;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.util.Assert;

/**
 * Socket based {@link TargetServerConnection}.
 *
 * @author Phillip Webb
 * @since 1.3.0
 */
public class SocketTargetServerConnection implements TargetServerConnection {

    private static final Log logger = LogFactory.getLog(SocketTargetServerConnection.class);

    private final PortProvider portProvider;

    /**
     * Create a new {@link SocketTargetServerConnection}.
     * @param portProvider the port provider
     */
    public SocketTargetServerConnection(PortProvider portProvider) {
        Assert.notNull(portProvider, "PortProvider must not be null");
        this.portProvider = portProvider;
    }

    @Override
    public ByteChannel open(int socketTimeout) throws IOException {
        SocketAddress address = new InetSocketAddress(this.portProvider.getPort());
        logger.trace("Opening tunnel connection to target server on " + address);
        SocketChannel channel = SocketChannel.open(address);
        channel.socket().setSoTimeout(socketTimeout);
        return new TimeoutAwareChannel(channel);
    }

    /**
     * Wrapper to expose the {@link SocketChannel} in such a way that
     * {@code SocketTimeoutExceptions} are still thrown from read methods.
     */
    private static class TimeoutAwareChannel implements ByteChannel {

        private final SocketChannel socketChannel;

        private final ReadableByteChannel readChannel;

        TimeoutAwareChannel(SocketChannel socketChannel) throws IOException {
            this.socketChannel = socketChannel;
            this.readChannel = Channels.newChannel(socketChannel.socket().getInputStream());
        }

        @Override
        public int read(ByteBuffer dst) throws IOException {
            return this.readChannel.read(dst);
        }

        @Override
        public int write(ByteBuffer src) throws IOException {
            return this.socketChannel.write(src);
        }

        @Override
        public boolean isOpen() {
            return this.socketChannel.isOpen();
        }

        @Override
        public void close() throws IOException {
            this.socketChannel.close();
        }

    }

}