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The core QuickFIX/J engine
/*
******************************************************************************
* Copyright (c) quickfixengine.org All rights reserved.
*
* This file is part of the QuickFIX FIX Engine
*
* This file may be distributed under the terms of the quickfixengine.org
* license as defined by quickfixengine.org and appearing in the file
* LICENSE included in the packaging of this file.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
* THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* See http://www.quickfixengine.org/LICENSE for licensing information.
*
* Contact [email protected] if any conditions of this licensing
* are not clear to you.
******************************************************************************/
package quickfix.mina;
import quickfix.LogUtil;
import quickfix.Message;
import quickfix.Session;
import quickfix.SessionID;
import quickfix.SystemTime;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
/**
* Processes messages for all sessions in a single thread.
*/
public class SingleThreadedEventHandlingStrategy implements EventHandlingStrategy {
public static final String MESSAGE_PROCESSOR_THREAD_NAME = "QFJ Message Processor";
private final BlockingQueue eventQueue;
private final SessionConnector sessionConnector;
private volatile ThreadAdapter messageProcessingThread;
private volatile boolean isStopped;
private Executor executor;
private long stopTime = 0L;
public SingleThreadedEventHandlingStrategy(SessionConnector connector, int queueCapacity) {
sessionConnector = connector;
eventQueue = new LinkedBlockingQueue<>(queueCapacity);
}
public void setExecutor(Executor executor) {
this.executor = executor;
}
@Override
public void onMessage(Session quickfixSession, Message message) {
if (message == END_OF_STREAM && isStopped) {
return;
}
try {
eventQueue.put(new SessionMessageEvent(quickfixSession, message));
} catch (InterruptedException e) {
isStopped = true;
throw new RuntimeException(e);
}
}
@Override
public SessionConnector getSessionConnector() {
return sessionConnector;
}
public void block() {
while (true) {
synchronized (this) {
if (isStopped) {
if (!eventQueue.isEmpty()) {
final List tempList = new ArrayList<>();
eventQueue.drainTo(tempList);
for (SessionMessageEvent event : tempList) {
event.processMessage();
}
}
if (stopTime == 0) {
stopTime = SystemTime.currentTimeMillis();
}
if (!sessionConnector.isLoggedOn() || SystemTime.currentTimeMillis() - stopTime > 5000L) {
sessionConnector.stopSessionTimer();
// reset the stoptime
stopTime = 0;
return;
}
}
}
try {
SessionMessageEvent event = getMessage();
if (event != null) {
event.processMessage();
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
private SessionMessageEvent getMessage() throws InterruptedException {
return eventQueue.poll(THREAD_WAIT_FOR_MESSAGE_MS, TimeUnit.MILLISECONDS);
}
/**
* Start handling of messages by message processor thread.
* If thread is still alive, an attempt is made to stop it.
* An IllegalStateException is thrown if stopping the old thread
* was not successful.
*
* This method must not be called by several threads concurrently.
*/
public void blockInThread() {
if (messageProcessingThread != null && messageProcessingThread.isAlive()) {
sessionConnector.log.warn("Trying to stop still running " + MESSAGE_PROCESSOR_THREAD_NAME);
stopHandlingMessages(true);
if (messageProcessingThread.isAlive()) {
throw new IllegalStateException("Still running " + MESSAGE_PROCESSOR_THREAD_NAME + " could not be stopped!");
}
}
startHandlingMessages();
messageProcessingThread = new ThreadAdapter(new Runnable() {
@Override
public void run() {
sessionConnector.log.info("Started " + MESSAGE_PROCESSOR_THREAD_NAME);
block();
sessionConnector.log.info("Stopped " + MESSAGE_PROCESSOR_THREAD_NAME);
}
}, MESSAGE_PROCESSOR_THREAD_NAME, executor);
messageProcessingThread.setDaemon(true);
messageProcessingThread.start();
}
private static class SessionMessageEvent {
private final Session quickfixSession;
private final Message message;
public SessionMessageEvent(Session session, Message message) {
this.message = message;
quickfixSession = session;
}
public void processMessage() {
try {
quickfixSession.next(message);
} catch (Throwable e) {
LogUtil.logThrowable(quickfixSession.getSessionID(), e.getMessage(), e);
}
}
}
private synchronized void startHandlingMessages() {
isStopped = false;
}
public synchronized void stopHandlingMessages() {
for (Session session : sessionConnector.getSessionMap().values()) {
onMessage(session, END_OF_STREAM);
}
isStopped = true;
}
public void stopHandlingMessages(boolean join) {
stopHandlingMessages();
if (join) {
try {
messageProcessingThread.join();
} catch (InterruptedException e) {
sessionConnector.log.error(MESSAGE_PROCESSOR_THREAD_NAME + " interrupted.");
}
}
}
@Override
public int getQueueSize() {
return eventQueue.size();
}
@Override
public int getQueueSize(SessionID sessionID) {
// we only have one queue for all sessions
return getQueueSize();
}
/**
* A stand-in for the Thread class that delegates to an Executor.
* Implements all the API required by pre-existing QFJ code.
*/
static final class ThreadAdapter {
private final Executor executor;
private final RunnableWrapper wrapper;
ThreadAdapter(Runnable command, String name, Executor executor) {
wrapper = new RunnableWrapper(command, name);
this.executor = executor != null ? executor : new DedicatedThreadExecutor(name);
}
public void join() throws InterruptedException {
wrapper.join();
}
public void setDaemon(boolean b) {
/* No-Op. Already set for DedicatedThreadExecutor. Not relevant for externally supplied Executors. */
}
public boolean isAlive() {
return wrapper.isAlive();
}
public void start() {
executor.execute(wrapper);
}
/**
* Provides the Thread::join and Thread::isAlive semantics on the nested Runnable.
*/
static final class RunnableWrapper implements Runnable {
private final CountDownLatch latch = new CountDownLatch(1);
private final Runnable command;
private final String name;
public RunnableWrapper(Runnable command, String name) {
this.command = command;
this.name = name;
}
@Override
public void run() {
Thread currentThread = Thread.currentThread();
String threadName = currentThread.getName();
try {
if (!name.equals(threadName)) {
currentThread.setName(name + " (" + threadName + ")");
}
command.run();
} finally {
latch.countDown();
currentThread.setName(threadName);
}
}
public void join() throws InterruptedException {
latch.await();
}
public boolean isAlive() {
return latch.getCount() > 0;
}
}
/**
* An Executor that uses it's own dedicated Thread.
* Provides equivalent behavior to the prior non-Executor approach.
*/
static final class DedicatedThreadExecutor implements Executor {
private final String name;
DedicatedThreadExecutor(String name) {
this.name = name;
}
@Override
public void execute(Runnable command) {
Thread thread = new Thread(command, name);
thread.setDaemon(true);
thread.start();
}
}
}
}