I'm interacting with ActiveMQ via STOMP. I have one process which publishes messages and a multiple processes that subscribes and processes the messages (about 10 parallel instances).
After reading a message I want to be sure that if, for some reason my application fails/crashes, the message will not be lost. So naturally, I turned to transactions. Unfortunately, I discovered that once a consumer reads a message as a part of the transaction, all the following messages are not being sent to the other consumers, until the transaction ends.
Test case: abc queue has a 100 messages. If I activate the following code in two different browser tabs, the first will return in 10 seconds and the second will return in 20 seconds.
<?php
// Reader.php
$con = new Stomp("tcp://localhost:61613");
$con->connect();
$con->subscribe(
"/queue/abc",
array()
);
$tx = "tx3".microtime();
echo "TX:$tx<BR>";
$con->begin($tx);
$messages = array();
for ($i = 0; $i < 10; $i++) {
$t = microtime(true);
$msg = $con->readFrame();
if (!$msg) {
die("FAILED!");
}
$t = microtime(true)-$t; echo "readFrame() took $t MS to complete<BR>";
array_push($messages, $msg);
$con->ack($msg, $tx);
sleep(1);
}
$con->abort($tx);
Is there something I'm missing code-wise? Is there a way to configure ActiveMQ (or send a header) that will make the transaction remove the item from the queue, allow other processes consume the other messages, and if the transaction fails or is timed-out, will put the item back in?
PS: I thought about creating another queue - DetentionQueue for each reading process but I really rather not do it if I have a choice.
