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Polish WebSocket session decorator and tests

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This commit is contained in:
Rossen Stoyanchev
2016-02-04 16:15:41 -05:00
parent 26edc674ed
commit 7ed2b8fd81
2 changed files with 68 additions and 110 deletions
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72
spring-websocket/src/main/java/org/springframework/web/socket/handler/ConcurrentWebSocketSessionDecorator.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2015 the original author or authors.
* Copyright 2002-2016 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.
@@ -31,13 +31,14 @@ import org.springframework.web.socket.WebSocketMessage;
import org.springframework.web.socket.WebSocketSession;
/**
* Wraps a {@link org.springframework.web.socket.WebSocketSession} and guarantees
* only one thread can send messages at a time.
* Wrap a {@link org.springframework.web.socket.WebSocketSession WebSocketSession}
* to guarantee only one thread can send messages at a time.
*
* <p>If a send is slow, subsequent attempts to send more messages from a different
* thread will fail to acquire the flush lock and the messages will be buffered
* instead: At that time, the specified buffer-size limit and send-time limit will
* be checked and the session closed if the limits are exceeded.
* <p>If a send is slow, subsequent attempts to send more messages from other
* threads will not be able to acquire the flush lock and messages will be
* buffered instead -- at that time, the specified buffer-size limit and
* send-time limit will be checked and the session closed if the limits are
* exceeded.
*
* @author Rossen Stoyanchev
* @since 4.0.3
@@ -47,21 +48,20 @@ public class ConcurrentWebSocketSessionDecorator extends WebSocketSessionDecorat
private static final Log logger = LogFactory.getLog(ConcurrentWebSocketSessionDecorator.class);
private final Queue<WebSocketMessage<?>> buffer = new LinkedBlockingQueue<WebSocketMessage<?>>();
private final AtomicInteger bufferSize = new AtomicInteger();
private final int sendTimeLimit;
private final int bufferSizeLimit;
private final Queue<WebSocketMessage<?>> buffer = new LinkedBlockingQueue<WebSocketMessage<?>>();
private final AtomicInteger bufferSize = new AtomicInteger();
private volatile long sendStartTime;
private final int sendTimeLimit;
private volatile boolean limitExceeded;
private volatile boolean shutdownInProgress;
private volatile boolean closeInProgress;
private final Lock flushLock = new ReentrantLock();
@@ -93,7 +93,7 @@ public class ConcurrentWebSocketSessionDecorator extends WebSocketSessionDecorat
public void sendMessage(WebSocketMessage<?> message) throws IOException {
if (isDisabled()) {
if (shouldNotSend()) {
return;
}
@@ -103,32 +103,33 @@ public class ConcurrentWebSocketSessionDecorator extends WebSocketSessionDecorat
do {
if (!tryFlushMessageBuffer()) {
if (logger.isTraceEnabled()) {
logger.trace("Another send already in progress, session id '" +
getId() + "'" + ", in-progress send time " + getTimeSinceSendStarted() +
" (ms)" + ", buffer size " + this.bufferSize + " bytes");
String text = String.format("Another send already in progress: " +
"session id '%s':, \"in-progress\" send time %d (ms), buffer size %d bytes",
getId(), getTimeSinceSendStarted(), this.bufferSize.get());
logger.trace(text);
}
checkSessionLimits();
break;
}
}
while (!this.buffer.isEmpty() && !isDisabled());
while (!this.buffer.isEmpty() && !shouldNotSend());
}
private boolean isDisabled() {
return (this.limitExceeded || this.shutdownInProgress);
private boolean shouldNotSend() {
return (this.limitExceeded || this.closeInProgress);
}
private boolean tryFlushMessageBuffer() throws IOException {
if (this.flushLock.tryLock()) {
try {
while (true) {
WebSocketMessage<?> messageToSend = this.buffer.poll();
if (messageToSend == null || isDisabled()) {
WebSocketMessage<?> message = this.buffer.poll();
if (message == null || shouldNotSend()) {
break;
}
this.bufferSize.addAndGet(messageToSend.getPayloadLength() * -1);
this.bufferSize.addAndGet(message.getPayloadLength() * -1);
this.sendStartTime = System.currentTimeMillis();
getDelegate().sendMessage(messageToSend);
getDelegate().sendMessage(message);
this.sendStartTime = 0;
}
}
@@ -142,18 +143,17 @@ public class ConcurrentWebSocketSessionDecorator extends WebSocketSessionDecorat
}
private void checkSessionLimits() throws IOException {
if (!isDisabled() && this.closeLock.tryLock()) {
if (!shouldNotSend() && this.closeLock.tryLock()) {
try {
if (getTimeSinceSendStarted() > this.sendTimeLimit) {
String errorMessage = "Message send time " + getTimeSinceSendStarted() +
" (ms) exceeded the allowed limit " + this.sendTimeLimit;
sessionLimitReached(errorMessage, CloseStatus.SESSION_NOT_RELIABLE);
String format = "Message send time %d (ms) for session '%s' exceeded the allowed limit %d";
String reason = String.format(format, getTimeSinceSendStarted(), getId(), this.sendTimeLimit);
setLimitExceeded(reason);
}
else if (this.bufferSize.get() > this.bufferSizeLimit) {
String errorMessage = "The send buffer size " + this.bufferSize.get() + " bytes for " +
"session '" + getId() + " exceeded the allowed limit " + this.bufferSizeLimit;
sessionLimitReached(errorMessage,
(getTimeSinceSendStarted() >= 10000 ? CloseStatus.SESSION_NOT_RELIABLE : null));
String format = "The send buffer size %d bytes for session '%s' exceeded the allowed limit %d";
String reason = String.format(format, this.bufferSize.get(), getId(), this.bufferSizeLimit);
setLimitExceeded(reason);
}
}
finally {
@@ -162,14 +162,14 @@ public class ConcurrentWebSocketSessionDecorator extends WebSocketSessionDecorat
}
}
private void sessionLimitReached(String reason, CloseStatus status) {
private void setLimitExceeded(String reason) {
this.limitExceeded = true;
throw new SessionLimitExceededException(reason, status);
throw new SessionLimitExceededException(reason, CloseStatus.SESSION_NOT_RELIABLE);
}
@Override
public void close(CloseStatus status) throws IOException {
this.shutdownInProgress = true;
this.closeInProgress = true;
super.close(status);
}