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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 java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
/**
* Processes messages in a session-specific thread.
*/
public class ThreadPerSessionEventHandlingStrategy implements EventHandlingStrategy {
private final ConcurrentMap dispatchers = new ConcurrentHashMap<>();
private final SessionConnector sessionConnector;
private final int queueCapacity;
private volatile Executor executor;
public ThreadPerSessionEventHandlingStrategy(SessionConnector connector, int queueCapacity) {
sessionConnector = connector;
this.queueCapacity = queueCapacity;
}
public void setExecutor(Executor executor) {
this.executor = executor;
}
@Override
public void onMessage(Session quickfixSession, Message message) {
MessageDispatchingThread dispatcher = dispatchers.get(quickfixSession.getSessionID());
if (dispatcher == null) {
final MessageDispatchingThread temp = new MessageDispatchingThread(quickfixSession, queueCapacity, executor);
dispatcher = dispatchers.putIfAbsent(quickfixSession.getSessionID(), temp);
if (dispatcher == null) {
dispatcher = temp;
}
startDispatcherThread(dispatcher);
}
if (message != null) {
dispatcher.enqueue(message);
}
}
/**
* The SessionConnector is not directly required for thread-per-session handler - we don't multiplex
* between multiple sessions here.
* However it is made available here for other callers (such as SessionProviders wishing to register dynamic sessions).
* @return the SessionConnector
*/
@Override
public SessionConnector getSessionConnector() {
return sessionConnector;
}
protected void startDispatcherThread(MessageDispatchingThread dispatcher) {
dispatcher.start();
}
public void stopDispatcherThreads() {
// dispatchersToShutdown is backed by the map itself so changes in one are reflected in the other
final Collection dispatchersToShutdown = dispatchers.values();
for (final MessageDispatchingThread dispatcher : dispatchersToShutdown) {
dispatcher.stopDispatcher();
}
// wait for threads to stop
while (!dispatchersToShutdown.isEmpty()) {
try {
Thread.sleep(100);
} catch (final InterruptedException e) {
Thread.currentThread().interrupt();
}
for (final Iterator iterator = dispatchersToShutdown
.iterator(); iterator.hasNext();) {
final MessageDispatchingThread messageDispatchingThread = iterator.next();
if (messageDispatchingThread.isStopped()) {
iterator.remove();
}
}
}
}
/**
* A stand-in for the Thread class that delegates to an Executor.
* Implements all the API required by pre-existing QFJ code.
*/
protected static abstract class ThreadAdapter implements Runnable {
private final Executor executor;
private final String name;
public ThreadAdapter(String name, Executor executor) {
this.name = name;
this.executor = executor != null ? executor : new DedicatedThreadExecutor(name);
}
public void start() {
executor.execute(this);
}
@Override
public final void run() {
Thread currentThread = Thread.currentThread();
String threadName = currentThread.getName();
try {
if (!name.equals(threadName)) {
currentThread.setName(name + " (" + threadName + ")");
}
doRun();
} finally {
currentThread.setName(threadName);
}
}
abstract void doRun();
/**
* 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) {
new Thread(command, name).start();
}
}
}
protected class MessageDispatchingThread extends ThreadAdapter {
private final Session quickfixSession;
private final BlockingQueue messages;
private volatile boolean stopped;
private volatile boolean stopping;
private MessageDispatchingThread(Session session, int queueCapacity, Executor executor) {
super("QF/J Session dispatcher: " + session.getSessionID(), executor);
quickfixSession = session;
messages = new LinkedBlockingQueue<>(queueCapacity);
}
public void enqueue(Message message) {
if (message == END_OF_STREAM && stopping) {
return;
}
try {
messages.put(message);
} catch (final InterruptedException e) {
quickfixSession.getLog().onErrorEvent(e.toString());
}
}
public int getQueueSize() {
return messages.size();
}
@Override
void doRun() {
while (!stopping) {
try {
final Message message = getNextMessage(messages);
if (message == null) {
// no message available in polling interval
continue;
}
quickfixSession.next(message);
if (message == END_OF_STREAM) {
stopping = true;
}
} catch (final InterruptedException e) {
LogUtil.logThrowable(quickfixSession.getSessionID(),
"Message dispatcher interrupted", e);
stopping = true;
} catch (final Throwable e) {
LogUtil.logThrowable(quickfixSession.getSessionID(),
"Error during message processing", e);
}
}
if (!messages.isEmpty()) {
final List tempList = new ArrayList<>();
messages.drainTo(tempList);
for (Message message : tempList) {
try {
quickfixSession.next(message);
} catch (final Throwable e) {
LogUtil.logThrowable(quickfixSession.getSessionID(),
"Error during message processing", e);
}
}
}
dispatchers.remove(quickfixSession.getSessionID());
stopped = true;
}
public void stopDispatcher() {
enqueue(END_OF_STREAM);
stopping = true;
stopped = true;
}
public boolean isStopped() {
return stopped;
}
}
protected MessageDispatchingThread getDispatcher(SessionID sessionID) {
return dispatchers.get(sessionID);
}
/**
* Get the next message from the messages {@link java.util.concurrent.BlockingQueue}.
*
* We do not block indefinitely as that would prevent this thread from ever stopping
*
* @see #THREAD_WAIT_FOR_MESSAGE_MS
* @param messages
* @return next message or null if nothing arrived within the timeout period
* @throws InterruptedException
*/
protected Message getNextMessage(BlockingQueue messages) throws InterruptedException {
return messages.poll(THREAD_WAIT_FOR_MESSAGE_MS, TimeUnit.MILLISECONDS);
}
@Override
public int getQueueSize() {
int ret = 0;
for (final MessageDispatchingThread mdt : dispatchers.values()) {
ret += mdt.getQueueSize();
}
return ret;
}
@Override
public int getQueueSize(SessionID sessionID) {
MessageDispatchingThread dispatchingThread = dispatchers.get(sessionID);
if (dispatchingThread != null) {
return dispatchingThread.getQueueSize();
}
return 0;
}
}