org.springframework.boot.devtools.tunnel.payload.HttpTunnelPayloadForwarder Maven / Gradle / Ivy
/*
* 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.payload;
import java.io.IOException;
import java.nio.channels.WritableByteChannel;
import java.util.HashMap;
import java.util.Map;
import org.springframework.util.Assert;
/**
* Utility class that forwards {@link HttpTunnelPayload} instances to a destination
* channel, respecting sequence order.
*
* @author Phillip Webb
* @since 1.3.0
*/
public class HttpTunnelPayloadForwarder {
private static final int MAXIMUM_QUEUE_SIZE = 100;
private final Map queue = new HashMap();
private final Object monitor = new Object();
private final WritableByteChannel targetChannel;
private long lastRequestSeq = 0;
/**
* Create a new {@link HttpTunnelPayloadForwarder} instance.
* @param targetChannel the target channel
*/
public HttpTunnelPayloadForwarder(WritableByteChannel targetChannel) {
Assert.notNull(targetChannel, "TargetChannel must not be null");
this.targetChannel = targetChannel;
}
public void forward(HttpTunnelPayload payload) throws IOException {
synchronized (this.monitor) {
long seq = payload.getSequence();
if (this.lastRequestSeq != seq - 1) {
Assert.state(this.queue.size() < MAXIMUM_QUEUE_SIZE,
"Too many messages queued");
this.queue.put(seq, payload);
return;
}
payload.logOutgoing();
payload.writeTo(this.targetChannel);
this.lastRequestSeq = seq;
HttpTunnelPayload queuedItem = this.queue.get(seq + 1);
if (queuedItem != null) {
forward(queuedItem);
}
}
}
}