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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 nginx.unit.websocket.server;
import java.io.EOFException;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.nio.ByteBuffer;
import java.nio.channels.CompletionHandler;
import java.nio.channels.InterruptedByTimeoutException;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.TimeUnit;
import javax.websocket.SendHandler;
import javax.websocket.SendResult;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
import nginx.unit.websocket.Transformation;
import nginx.unit.websocket.WsRemoteEndpointImplBase;
/**
* This is the server side {@link javax.websocket.RemoteEndpoint} implementation
* - i.e. what the server uses to send data to the client.
*/
public class WsRemoteEndpointImplServer extends WsRemoteEndpointImplBase {
private static final StringManager sm =
StringManager.getManager(WsRemoteEndpointImplServer.class);
private final Log log = LogFactory.getLog(WsRemoteEndpointImplServer.class); // must not be static
private volatile SendHandler handler = null;
private volatile ByteBuffer[] buffers = null;
private volatile long timeoutExpiry = -1;
private volatile boolean close;
public WsRemoteEndpointImplServer(
WsServerContainer serverContainer) {
}
@Override
protected final boolean isMasked() {
return false;
}
@Override
protected void doWrite(SendHandler handler, long blockingWriteTimeoutExpiry,
ByteBuffer... buffers) {
}
@Override
protected void doClose() {
if (handler != null) {
// close() can be triggered by a wide range of scenarios. It is far
// simpler just to always use a dispatch than it is to try and track
// whether or not this method was called by the same thread that
// triggered the write
clearHandler(new EOFException(), true);
}
}
protected long getTimeoutExpiry() {
return timeoutExpiry;
}
/*
* Currently this is only called from the background thread so we could just
* call clearHandler() with useDispatch == false but the method parameter
* was added in case other callers started to use this method to make sure
* that those callers think through what the correct value of useDispatch is
* for them.
*/
protected void onTimeout(boolean useDispatch) {
if (handler != null) {
clearHandler(new SocketTimeoutException(), useDispatch);
}
close();
}
@Override
protected void setTransformation(Transformation transformation) {
// Overridden purely so it is visible to other classes in this package
super.setTransformation(transformation);
}
/**
*
* @param t The throwable associated with any error that
* occurred
* @param useDispatch Should {@link SendHandler#onResult(SendResult)} be
* called from a new thread, keeping in mind the
* requirements of
* {@link javax.websocket.RemoteEndpoint.Async}
*/
private void clearHandler(Throwable t, boolean useDispatch) {
// Setting the result marks this (partial) message as
// complete which means the next one may be sent which
// could update the value of the handler. Therefore, keep a
// local copy before signalling the end of the (partial)
// message.
SendHandler sh = handler;
handler = null;
buffers = null;
if (sh != null) {
if (useDispatch) {
OnResultRunnable r = new OnResultRunnable(sh, t);
} else {
if (t == null) {
sh.onResult(new SendResult());
} else {
sh.onResult(new SendResult(t));
}
}
}
}
private static class OnResultRunnable implements Runnable {
private final SendHandler sh;
private final Throwable t;
private OnResultRunnable(SendHandler sh, Throwable t) {
this.sh = sh;
this.t = t;
}
@Override
public void run() {
if (t == null) {
sh.onResult(new SendResult());
} else {
sh.onResult(new SendResult(t));
}
}
}
}
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