mq5.0-source.main.mq-client.src.main.java.com.sun.messaging.jmq.jmsclient.AckQueue Maven / Gradle / Ivy
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/*
* @(#)AckQueue.java 1.14 06/27/07
*/
package com.sun.messaging.jmq.jmsclient;
import java.io.PrintStream;
import java.util.logging.Level;
import com.sun.messaging.AdministeredObject;
import com.sun.messaging.jmq.io.PacketType;
import com.sun.messaging.jmq.io.ReadWritePacket;
/**
* This Class is used by ProtocolHandler(for ack use).
*/
class AckQueue extends SessionQueue implements Traceable {
// The interval before the first *waiting for response* messages
// we double this interval before each subsequent message
protected static long INITIAL_LOG_INTERVAL = 120000; // 2 minutes
//debug flag.
private boolean debug = Debug.debug;
//mq will dump pkt if wait for more than 3 iterations in the while loop.
//This would be 120 + 240 + 360= 840 seconds.
private static int DEFAULT_DUMP_COUNTER = 3;
//dump connection state flag
private static boolean dumpConnectionState = true;
/**
* A private static system property to change the default
* wait time out to start printing "waiting for response"
* message. The default is set to 2 minutes. This is
* different from the wait timeout for broker response.
* The wait timeout for broker response is set to 0 (forever)
* by default (in ProtocolHandler).
*/
static {
try {
//in milli secs.
String prop = System.getProperty("imq.ackWaitTime");
if (prop != null) {
INITIAL_LOG_INTERVAL = Long.parseLong(prop);
}
String dump_prop = System.getProperty("imq.ackDumpCount");
if (dump_prop != null) {
DEFAULT_DUMP_COUNTER = Integer.parseInt(dump_prop);
}
boolean nostate = Boolean.getBoolean("imq.noConnectionState");
if ( nostate ) {
dumpConnectionState = false;
}
} catch (Exception e) {
Debug.printStackTrace(e);
}
}
public AckQueue() {
super();
}
public AckQueue (boolean useSequential, int size) {
super (useSequential, size);
}
/**
* Wait for a reply from the broker to arrive on this AckQueue.
* If the specified timeout is zero (no timeout) or is greater than 2 mins,
* logging messages are generated after 2 mins and periodically afterwards
* until a message arrives or the timeout is reached
*
* @param conn The connection to the broker
* @param pkt Used for logging only: The Packet for which we are awaiting a reply
* @param timeout Total amount we are prepared to wait, or 0 if we are prepared to wait indefinitely
* @return The reply packet
*/
protected synchronized Object dequeueWait(ConnectionImpl conn, ReadWritePacket pkt, long timeout) {
long totalElapsed = 0;
long timeLeftBeforeTimeout = timeout;
int icounter = 0;
// calculate appropriate wait time
long lengthOfNextWait;
if (timeout > 0 && timeout < INITIAL_LOG_INTERVAL) {
lengthOfNextWait=timeout;
} else {
lengthOfNextWait=INITIAL_LOG_INTERVAL;
}
while (isEmpty() && (isClosed == false)) {
/**
* resend is disabled due to bug ID 6551007: PREPARE_TRANSACTION pkt sent to broker again while waiting
* PREPARE_TRANSACTION_REPLY.
*
* This feature would require broker to handle resend. Otherwise broker prints error messages and caused
* confustion.
*/
if (icounter > 0) {
// resend (conn, pkt);
}
long waitStartedTime = System.currentTimeMillis();
try {
wait(lengthOfNextWait);
} catch (InterruptedException e) {
;
}
if (isEmpty() && (isClosed == false)) {
// work out how much time elapsed since we started the wait
// (this may have been a spurious wakeup so it isn't necessarily lengthOfNextWait)
long timeWeWaitedFor = System.currentTimeMillis()-waitStartedTime;
// total elapsed time so far
totalElapsed = totalElapsed + timeWeWaitedFor;
if (timeWeWaitedFor 0 ) {
ps.println ("^^^^^^ ack queue super class dump ^^^^^^");
super.dump(ps);
ps.println ("^^^^^^ end ack queue super class dump ^^^^^^");
}
}
}