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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;
import java.io.IOException;
import java.util.Collection;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* Used by the session communications code. Not intended to be used by applications. All dynamic data is protected by
* the session's intrinsic lock. The log and message store implementation must be thread safe.
*/
public final class SessionState {
private final Object lock;
private final Log log;
// MessageStore implementation must be thread safe
private final MessageStore messageStore;
private final Lock senderMsgSeqNumLock = new ReentrantLock();
private final Lock targetMsgSeqNumLock = new ReentrantLock();
private final boolean initiator;
private long logonTimeoutMs = 10000L;
private long logoutTimeoutMs = 2000L;
private boolean logonSent;
private boolean logonReceived;
private boolean logoutSent;
private boolean logoutReceived = false;
private int testRequestCounter;
private long lastSentTime;
private long lastReceivedTime;
private final double testRequestDelayMultiplier;
private long heartBeatMillis = Long.MAX_VALUE;
private int heartBeatInterval;
private final ResendRange resendRange = new ResendRange();
private boolean resetSent;
private boolean resetReceived;
private String logoutReason;
/*
* If this is anything other than zero it's the value of the 789/NextExpectedMsgSeqNum tag in the last Logon message sent.
* It is used to determine if the recipient has enough information (assuming they support 789) to avoid the need
* for a resend request i.e. they should be resending any necessary missing messages already. This value is used
* to populate the resendRange if necessary.
*/
private final AtomicInteger nextExpectedMsgSeqNum = new AtomicInteger(0);
// The messageQueue should be accessed from a single thread
private final Map messageQueue = new LinkedHashMap();
public SessionState(Object lock, Log log, int heartBeatInterval, boolean initiator, MessageStore messageStore,
double testRequestDelayMultiplier) {
this.lock = lock;
this.initiator = initiator;
this.messageStore = messageStore;
setHeartBeatInterval(heartBeatInterval);
this.log = log == null ? new NullLog() : log;
this.testRequestDelayMultiplier = testRequestDelayMultiplier;
}
public int getHeartBeatInterval() {
synchronized (lock) {
return heartBeatInterval;
}
}
public void setHeartBeatInterval(int heartBeatInterval) {
synchronized (lock) {
this.heartBeatInterval = heartBeatInterval;
}
setHeartBeatMillis(heartBeatInterval * 1000L);
}
private void setHeartBeatMillis(long heartBeatMillis) {
synchronized (lock) {
this.heartBeatMillis = heartBeatMillis;
}
}
long getHeartBeatMillis() {
synchronized (lock) {
return heartBeatMillis;
}
}
public boolean isHeartBeatNeeded() {
long millisSinceLastSentTime = SystemTime.currentTimeMillis() - getLastSentTime();
// QFJ-448: allow 10 ms leeway since exact comparison causes skipped heartbeats occasionally
return millisSinceLastSentTime + 10 > getHeartBeatMillis() && getTestRequestCounter() == 0;
}
public boolean isInitiator() {
return initiator;
}
public long getLastReceivedTime() {
synchronized (lock) {
return lastReceivedTime;
}
}
public void setLastReceivedTime(long lastReceivedTime) {
synchronized (lock) {
this.lastReceivedTime = lastReceivedTime;
}
}
public long getLastSentTime() {
synchronized (lock) {
return lastSentTime;
}
}
public void setLastSentTime(long lastSentTime) {
synchronized (lock) {
this.lastSentTime = lastSentTime;
}
}
public Log getLog() {
return log;
}
public boolean isLogonAlreadySent() {
return isInitiator() && isLogonSent();
}
public boolean isLogonReceived() {
synchronized (lock) {
return logonReceived;
}
}
public void setLogonReceived(boolean logonReceived) {
synchronized (lock) {
this.logonReceived = logonReceived;
}
}
public boolean isLogonSendNeeded() {
return isInitiator() && !isLogonSent();
}
public boolean isLogonSent() {
synchronized (lock) {
return logonSent;
}
}
public void setLogonSent(boolean logonSent) {
synchronized (lock) {
this.logonSent = logonSent;
}
}
public boolean isLogonTimedOut() {
synchronized (lock) {
return isLogonSent() && SystemTime.currentTimeMillis() - getLastReceivedTime() >= getLogonTimeoutMs();
}
}
public void setLogonTimeout(int logonTimeout) {
setLogonTimeoutMs(logonTimeout * 1000L);
}
public int getLogonTimeout() {
return (int) (getLogonTimeoutMs() / 1000L);
}
public void setLogoutTimeout(int logoutTimeout) {
setLogoutTimeoutMs(logoutTimeout * 1000L);
}
public int getLogoutTimeout() {
return (int) (getLogoutTimeoutMs() / 1000L);
}
private void setLogoutTimeoutMs(long logoutTimeoutMs) {
synchronized (lock) {
this.logoutTimeoutMs = logoutTimeoutMs;
}
}
private long getLogoutTimeoutMs() {
synchronized (lock) {
return logoutTimeoutMs;
}
}
private void setLogonTimeoutMs(long logonTimeoutMs) {
synchronized (lock) {
this.logonTimeoutMs = logonTimeoutMs;
}
}
private long getLogonTimeoutMs() {
synchronized (lock) {
return logonTimeoutMs;
}
}
public boolean isLogoutSent() {
synchronized (lock) {
return logoutSent;
}
}
public void setLogoutSent(boolean logoutSent) {
synchronized (lock) {
this.logoutSent = logoutSent;
}
}
public boolean isLogoutReceived() {
synchronized (lock) {
return logoutReceived;
}
}
public void setLogoutReceived(boolean logoutReceived) {
synchronized (lock) {
this.logoutReceived = logoutReceived;
}
}
public boolean isLogoutTimedOut() {
return isLogoutSent() && ((SystemTime.currentTimeMillis() - getLastSentTime()) >= getLogoutTimeoutMs());
}
public MessageStore getMessageStore() {
return messageStore;
}
private int getTestRequestCounter() {
synchronized (lock) {
return testRequestCounter;
}
}
public double getTestRequestDelayMultiplier() {
return testRequestDelayMultiplier;
}
public void clearTestRequestCounter() {
synchronized (lock) {
testRequestCounter = 0;
}
}
public void incrementTestRequestCounter() {
synchronized (lock) {
testRequestCounter++;
}
}
public boolean isTestRequestNeeded() {
long millisSinceLastReceivedTime = timeSinceLastReceivedMessage();
return millisSinceLastReceivedTime >= ((1 + testRequestDelayMultiplier) * (getTestRequestCounter() + 1))
* getHeartBeatMillis();
}
private long timeSinceLastReceivedMessage() {
return SystemTime.currentTimeMillis() - getLastReceivedTime();
}
public boolean isTimedOut() {
long millisSinceLastReceivedTime = timeSinceLastReceivedMessage();
return millisSinceLastReceivedTime >= 2.4 * getHeartBeatMillis();
}
public boolean set(int sequence, String message) throws IOException {
return messageStore.set(sequence, message);
}
public void get(int first, int last, Collection messages) throws IOException {
messageStore.get(first, last, messages);
}
public void enqueue(int sequence, Message message) {
messageQueue.put(sequence, message);
}
public Message dequeue(int sequence) {
return messageQueue.remove(sequence);
}
/**
* Remove messages from messageQueue up to a given sequence number.
*
* @param seqnum up to which sequence number messages should be deleted
*/
public void dequeueMessagesUpTo(int seqnum) {
for (int i = 1; i < seqnum; i++) {
dequeue(i);
}
}
public Message getNextQueuedMessage() {
return !messageQueue.isEmpty() ? messageQueue.values().iterator().next() : null;
}
public Collection getQueuedSeqNums() {
return messageQueue.keySet();
}
public void clearQueue() {
messageQueue.clear();
}
public void lockSenderMsgSeqNum() {
senderMsgSeqNumLock.lock();
}
public void unlockSenderMsgSeqNum() {
senderMsgSeqNumLock.unlock();
}
public void lockTargetMsgSeqNum() {
targetMsgSeqNumLock.lock();
}
public void unlockTargetMsgSeqNum() {
targetMsgSeqNumLock.unlock();
}
public int getNextSenderMsgSeqNum() throws IOException {
return messageStore.getNextSenderMsgSeqNum();
}
public int getNextTargetMsgSeqNum() throws IOException {
return messageStore.getNextTargetMsgSeqNum();
}
public void setNextTargetMsgSeqNum(int sequence) throws IOException {
messageStore.setNextTargetMsgSeqNum(sequence);
}
public void incrNextSenderMsgSeqNum() throws IOException {
messageStore.incrNextSenderMsgSeqNum();
}
public void incrNextTargetMsgSeqNum() throws IOException {
messageStore.incrNextTargetMsgSeqNum();
}
public Date getCreationTime() throws IOException {
return messageStore.getCreationTime();
}
public boolean isResetNeeded() throws IOException {
return getNextSenderMsgSeqNum() != 1 || getNextTargetMsgSeqNum() != 1;
}
public void reset() {
try {
messageStore.reset();
} catch (IOException e) {
throw new RuntimeError(e);
}
}
public void setResendRange(int low, int high) {
synchronized (lock) {
resendRange.setBeginSeqNo(low);
resendRange.setEndSeqNo(high);
}
}
public void setResendRange(int low, int high, int currentResend) {
synchronized (lock) {
resendRange.setBeginSeqNo(low);
resendRange.setEndSeqNo(high);
resendRange.setCurrentEndSeqNo(currentResend);
}
}
public boolean isResendRequested() {
synchronized (lock) {
return !(resendRange.getBeginSeqNo() == 0 && resendRange.getEndSeqNo() == 0);
}
}
public ResendRange getResendRange() {
synchronized (lock) {
return resendRange;
}
}
public boolean isResetReceived() {
synchronized (lock) {
return resetReceived;
}
}
public void setResetReceived(boolean resetReceived) {
synchronized (lock) {
this.resetReceived = resetReceived;
}
}
public boolean isResetSent() {
synchronized (lock) {
return resetSent;
}
}
public void setResetSent(boolean resetSent) {
synchronized (lock) {
this.resetSent = resetSent;
}
}
/**
* No actual resend request has occurred but at logon we populated tag 789 so that the other side knows we
* are missing messages without an explicit resend request and should immediately reply with the missing
* messages.
*
* This is expected to be called only in the scenario where target is too high on logon and tag 789 is supported.
*/
public void setResetRangeFromLastExpectedLogonNextSeqNumLogon() {
synchronized (lock) {
// we have already requested all msgs from nextExpectedMsgSeqNum to infinity
setResendRange(getLastExpectedLogonNextSeqNum(), 0);
// clean up the variable (not really needed)
setLastExpectedLogonNextSeqNum(0);
}
}
/**
* @param lastExpectedLogonNextSeqNum
*
* This method is thread safe (atomic set).
*/
public void setLastExpectedLogonNextSeqNum(int lastExpectedLogonNextSeqNum) {
this.nextExpectedMsgSeqNum.set(lastExpectedLogonNextSeqNum);
}
/**
* @return nextExpectedMsgSeqNum
*
* This method is thread safe (atomic get).
*/
public int getLastExpectedLogonNextSeqNum() {
return this.nextExpectedMsgSeqNum.get();
}
/**
* @return true if we populated tag 789 at logon and our sequence
* numbers don't line up we are in an implicit resend mode.
*
* This method is thread safe (atomic get).
*/
public boolean isExpectedLogonNextSeqNumSent() {
return this.nextExpectedMsgSeqNum.get() != 0;
}
public void setLogoutReason(String reason) {
synchronized (lock) {
logoutReason = reason;
}
}
public String getLogoutReason() {
synchronized (lock) {
return logoutReason;
}
}
public void clearLogoutReason() {
synchronized (lock) {
logoutReason = "";
}
}
public Object getLock() {
return lock;
}
private final static class NullLog implements Log {
public void onOutgoing(String message) {
}
public void onIncoming(String message) {
}
public void onEvent(String text) {
}
public void onErrorEvent(String text) {
}
public void clear() {
}
}
/**
* The resend range when sending a resend request.
* If a gap is detected and messages from x to y are needed, the received messages are checked against the values x and y that are stored in the resendRange.
* Some FIX engines do not support resendRequest range greater than a given value. There, in this case, the ResendRequests have to be splitted.
* E.g.: CME will reject any resend request for more than 2500 messages.
* The solution is to send resend requests with smaller range until the global range has been requested.
*
* The resendRange contains 3 values:
*
* - the begin index of the global resend request
* - the last index of the global resend request
* - the current last index of the splitted sub resend request
*
*/
public static class ResendRange {
int beginSeqNo = 0;
int endSeqNo = 0;
int currentEndSeqNo = 0;
public int getBeginSeqNo() {
return beginSeqNo;
}
public void setBeginSeqNo(int beginSeqNo) {
this.beginSeqNo = beginSeqNo;
}
public int getEndSeqNo() {
return endSeqNo;
}
public void setEndSeqNo(int endSeqNo) {
this.endSeqNo = endSeqNo;
}
public int getCurrentEndSeqNo() {
return currentEndSeqNo;
}
public void setCurrentEndSeqNo(int currentEndSeqNo) {
this.currentEndSeqNo = currentEndSeqNo;
}
public boolean isChunkedResendRequest() {
return getCurrentEndSeqNo() > 0;
}
}
}