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# RabbitMQ C AMQP client library ## Introduction This is a C-language AMQP client library for use with AMQP servers speaking protocol versions 0-8 and 0-9-1. - <http://www.rabbitmq.com/> - <http://www.amqp.org/> - <http://hg.rabbitmq.com/rabbitmq-c> *NB*: This library's source code supports *either* 0-8 *or* 0-9-1, not both simultaneously. Please check carefully that you have the variant you require. Announcements regarding the library are periodically made on the RabbitMQ mailing list and on LShift's blog. - <http://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss> - <http://www.lshift.net/blog/> - <http://www.lshift.net/blog/category/lshift-sw/rabbitmq/> ## Retrieving the code In addition to the source code for this library, you will require a copy of `rabbitmq-codegen`. Here is a short `sh` script for retrieving the necessary pieces: hg clone http://hg.rabbitmq.com/rabbitmq-codegen/ hg clone http://hg.rabbitmq.com/rabbitmq-c/ You will also need a recent python with the simplejson module installed, and the GNU autotools (autoconf, automake, libtool etc). ## Building the code Once you have all the prerequisites, change to the `rabbitmq-c` directory and run autoreconf -i to run the GNU autotools and generate the configure script, followed by ./configure make to build the `librabbitmq` library and the example programs. ## Running the examples Arrange for a RabbitMQ or other AMQP server to be running on `localhost` at TCP port number 5672. In one terminal, run ./examples/amqp_listen localhost 5672 amq.direct test In another terminal, ./examples/amqp_sendstring localhost 5672 amq.direct test "hello world" You should see output similar to the following in the listener's terminal window: Result 1 Frame type 1, channel 1 Method AMQP_BASIC_DELIVER_METHOD Delivery 1, exchange amq.direct routingkey test Content-type: text/plain ---- 00000000: 68 65 6C 6C 6F 20 77 6F : 72 6C 64 hello world 0000000B: ## Writing applications using `librabbitmq` Please see the `examples` directory for short examples of the use of the `librabbitmq` library. ### Threading You cannot share a socket, an `amqp_connection_state_t`, or a channel between threads using `librabbitmq`. The `librabbitmq` library is built with event-driven, single-threaded applications in mind, and does not yet cater to any of the requirements of `pthread`ed applications. Your applications instead should open an AMQP connection (and an associated socket, of course) per thread. If your program needs to access an AMQP connection or any of its channels from more than one thread, it is entirely responsible for designing and implementing an appropriate locking scheme. It will generally be much simpler to have a connection exclusive to each thread that needs AMQP service. ### Switching the codebase to the 0-9-1 protocol version In current releases, the default (trunk) branch of the mercurial repository hosting the `rabbitmq-c` code is set up for AMQP 0-8 support, with AMQP 0-9-1 support living on a separate mercurial branch. NOTE: Protocol versions 0-8 and 0-9-1 are incompatible on the wire. You cannot use a client library that speaks one protocol version to communication with a server that speaks the other. To switch your checked-out copy of the source code to 0-9-1 support, (cd rabbitmq-codegen; hg up amqp_0_9_1) (cd rabbitmq-c; hg up amqp_0_9_1) before building the code. If you switch branches after having compiled the code, make sure to rerun `autoreconf`, `configure`, `make clean` and `make` after switching branches.