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Beginning Perl (3rd Edition)

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How do we handle lost messages? Do we wait for fresh data, request a resend, or do we build some kind of reliability layer that ensures messages cannot be lost? What if that layer itself crashes? • What if we need to use a different network transport? Say, multicast instead of TCP unicast? Or IPv6? Do we need to rewrite the applications, or is the transport ab‐ stracted in some layer? • How do we route messages? Can we send the same message to multiple peers? Can we send replies back to an original requester?

MQ does not send the message (single or multipart) right away, but at some in‐ determinate later time. A multipart message must therefore fit in memory. • A single-part message must also fit in memory. If you want to send files of arbitrary sizes, you should break them into pieces and send each piece as separate single-part messages. • You must call zmq_msg_close() when finished with a message, in languages that don’t automatically destroy objects when a scope closes. And to be necessarily repetitive, do not use zmq_msg_init_data() yet.

In memory, ØMQ messages are zmq_msg_t structures (or classes, depending on your language). Here are the basic ground rules for using ØMQ messages in C: • You create and pass around zmq_msg_t objects, not blocks of data. • To read a message, you use zmq_msg_init() to create an empty message, and then you pass that to zmq_msg_recv(). • To write a message from new data, you use zmq_msg_init_size() to create a mes‐ sage and at the same time allocate a block of data of some size. You then fill that data using memcpy(), and pass the message to zmq_msg_send().

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