PHP AMQP Message Queuing RabbitMQ exchanger Type Direct Connect (iii)

1, Amqp_ex_type_direct: direct-connected direct-connect type also includes: 1 pairs of 1 and 1 pairs n (n-to-1, n-N)

The Receive-side receive.php code is as follows?

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<!--? php $connect =newamqpconnection ();   $connect--->connect ();   $channel =newamqpchannel ($connect); $exchange =newamqpexchange ($channel); $exchange->setname (' Exchange '); $exchange->settype (Amqp_ex_type_direct);   $exchange->declare (); $queue =newamqpqueue ($channel); $queue->setname (' logs ');   $queue->declare ();   $queue->bind (' Exchange ', ' logs ');   while (true) {$queue->consume (' callback ');}   $connection->close ();     function callback ($envelope, $queue) {var_dump ($envelope->getbody ()); $queue->nack ($envelope->getdeliverytag ()); }

The sending side send.php code is as follows
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<!--? php $connect =newamqpconnection ();   $connect--->connect ();   $channel =newamqpchannel ($connect); $exchange =newamqpexchange ($channel); $exchange->setname (' Exchange '); $exchange->settype (Amqp_ex_type_direct);   $exchange->declare (); $exchange->publish (' Direct type test ', ' logs ');   Var_dump ("Send Message OK"); $connect->disconnect ();

Run results




Create receive_one.php and receive_two.php and change the send.php code to code like this to allow us to watch receive_one.php and receive_two.php code the same or run multiple receivers with DOS
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<!--? php $connect =newamqpconnection ();   $connect--->connect ();   $channel =newamqpchannel ($connect); $exchange =newamqpexchange ($channel); $exchange->setname (' Exchange '); $exchange->settype (Amqp_ex_type_direct);   $exchange->declare (); $queue =newamqpqueue ($channel); $queue->setname (' logs ');   @ $queue->declare ();   $queue->bind (' Exchange ', ' logs ');   while (true) {$queue->consume (' callback ');}   $connection->close ();     function callback ($envelope, $queue) {var_dump ($envelope->getbody ()); $queue->nack ($envelope->getdeliverytag ()); }

send.php
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<!--? php $connect =newamqpconnection ();   $connect--->connect ();   $channel =newamqpchannel ($connect); $exchange =newamqpexchange ($channel); $exchange->setname (' Exchange '); $exchange->settype (Amqp_ex_type_direct);   $exchange->declare ();     for ($index =1; $index <5; $index + +) {$exchange->publish ($index, ' logs '); Var_dump ("Send: $index"); } $exchange->delete (); $connect->disconnect ();

The operation results are as follows

Queues will assign messages to each receive-side allocation process it seems perfect, but if you want to handle different tasks better, you need to Fair Dispatch
For example, when 1, 3 are processed by simple people 2, 4 are the complex task of processing if the task is too much receive_one.php is idle and receive_two.php is a heavy task we carried out the following test send.php changed to 5 50?

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for ($index =1; $index <50; $index + +) {$exchange->publish ($index, ' logs '); Var_dump ("Send: $index"); }

receive_two.php plus sleep (3)
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function callback ($envelope, $queue) {var_dump ($envelope->getbody ());     Sleep (3); $queue->nack ($envelope->getdeliverytag ()); }

We run the program with the following results


Receive_one all run out and Receive_two only run one after Receive_one has been idle we can set $channel->setprefetchcount (1) at the receiving end;
The task does not receive new messages before they are completed send messages to other receivers
The following receive_one.php and receive_two.php?

1	$channel =newamqpchannel ($connect);

Change to the following
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1 2	$channel =newamqpchannel ($connect); $channel->setprefetchcount (1);

PHP AMQP Message Queuing RabbitMQ exchanger Type Direct Connect (iii)