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copied!<p>Consider using a message queue like <a href="http://activemq.apache.org/" rel="nofollow">ActiveMQ</a>, <a href="http://activemq.apache.org/apollo/" rel="nofollow">Apollo</a>, <a href="http://www.hornetq.org/" rel="nofollow">HornetQ</a> or <a href="http://rabbitmq.com/" rel="nofollow">RabbitMQ</a>. There are (open source and commercial) libraries for Delphi available which allow to exchange messages over message queues.</p> <p>The PHP app would send documents (text or binary data) to a message queue, for example <code>/queue/new_pledge</code>. The message is stored on the (ActiveMQ / HornetQ / RabbitMQ) message broker and waits there until the Delphi client connects. If the Delphi app connectes, it fetches all pending messages, similar to reading new email in a mail application. Sender and the client do not have to run at the same time (asynchronous operation).</p> <p>This solution also supports load balancing: if more documents are received than can be handled by a single Delphi application, simply start additional instances on more computers. The messages in the queue will then be distributed between all Delphi apps.</p> <p>For the PHP side, there are message broker client libraries which use a simple protocol called STOMP which is supported by these open source message brokers. </p> <p>(I am the author of the <a href="http://www.habarisoft.com/" rel="nofollow">Habari Client</a> STOMP libraries for Delphi and Free Pascal, wich support five different message brokers)</p> <hr> <p>p.s. there is also a message queue system already in the operating system: <a href="http://en.wikipedia.org/wiki/Microsoft_Message_Queuing" rel="nofollow">Microsoft Message Queuing (MSMQ)</a>. </p>

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