102 lines
4.7 KiB
Markdown
102 lines
4.7 KiB
Markdown
SimpleAmqpClient
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==================
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[SimpleAmqpClient](https://github.com/alanxz/SimpleAmqpClient) is an easy-to-use C++
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wrapper around the [rabbitmq-c](https://github.com/alanxz/rabbitmq-c) C library.
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It derives inspiration from the [puka](https://github.com/majek/puka) AMQP library
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in that it abstracts away the underlying AMQP wire concept of channels and uses them
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as an error/consumer scope. This should make writing simple single-threaded AMQP-enabled apps easy.
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Installing
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----------------
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Known to work in the following environments:
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- Windows 10 (MSVC 2019, Win64)
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- Windows 7 (MSVC 10, Win64, Win32). Likely to work in others, but has not been tested
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- Linux (RHEL 6.0, GCC-4.4.5, 32 and 64 bit). Likely to work on other configurations, but has not been tested
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- Mac OS X (10.7, 10.6, gcc-4.2, 32 and 64-bit). Likely to work on older version, but has not been tested
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### Pre-requisites
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+ [boost-1.47.0](http://www.boost.org/) or newer (uses chrono, system internally in addition to other header based libraries such as sharedptr and noncopyable)
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+ [rabbitmq-c](http://github.com/alanxz/rabbitmq-c) you'll need version 0.8.0 or better.
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+ [cmake 3.5+](http://www.cmake.org/) what is needed for the build system
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+ [Doxygen](http://www.stack.nl/~dimitri/doxygen/) OPTIONAL only necessary to generate API documentation
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### Build procedure
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This is a typical cmake project, it should work like most typical cmake projects:
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In a sibling directory to where you extracted the source code:
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mkdir simpleamqpclient-build
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cd simpleamqpclient-build
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cmake ..
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Then use your the appropriate build utility to build the library (make, msbuild)
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Interesting targets
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+ test - will build and run the tests
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+ install - will install the library and headers to whatever `CMAKE_INSTALL_PREFIX` is defined to
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+ doc - will generate API documentation if you have doxygen setup
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Notes:
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+ The test google-test based test suite can be enabled by passing `-DENABLE_TESTING=ON` to
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cmake
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### Build procedure for Windows
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Boost libraries are needed, so you can install them using nuget:
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```
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nuget install boost_chrono-vc142 -Version 1.77.0
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nuget install boost_system-vc142 -Version 1.77.0
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nuget install boost -Version 1.77.0
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```
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To build and install succesfully, [rabbitmq-c](https://github.com/alanxz/rabbitmq-c) should be built **as shared library**.
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Let *boost_chrono* and *boost_system* be in same directory ```C:\boost```, [rabbitmq-c](https://github.com/alanxz/rabbitmq-c) be on ```C:\rabbitmq-c```,
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SSL be OFF, and VS2019 is used, than CMake CLI is:
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```
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cd cmake -G "Visual Studio 16" -A x64 -DBoost_INCLUDE_DIR="C:/boost.XX.XX.X.X/lib/native/include" -DBOOST_ROOT="C:/boost.X.XX.X.X" -DBOOST_LIBRARYDIR="C:/boost" -DRabbitmqc_INCLUDE_DIR="C:/rabbitmq-c/include" -DRabbitmqc_LIBRARY="C:/rabbitmq-c/lib/rabbitmq.4.lib" -DBoost_USE_STATIC_LIBS=ON -DBUILD_STATIC_LIBS=ON -DENABLE_SSL_SUPPORT=OFF ..
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```
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Using the library
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-----------------
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#include <SimpleAmqpClient/SimpleAmqpClient.h>
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Will include all the headers necessary to use the library.
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The corresponding library is SimpleAmqpClient
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The main interface to the library is the AmqpClient::Channel class. It represents
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a connection to an AMQP broker, the connection is established on construction of an
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instance of this class.
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AmqpClient::Channel::ptr_t connection = AmqpClient::Channel::Create("localhost");
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All classes have a typedef ptr_t which is equivalent to boost::shared_ptr<> of the
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containing class. All classes also have a Create() method does the job creating a new
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ptr_t using boost::make_shared<>(). It is recommended that you use these methods
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to construct objects in the library.
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Commands dealing with declaring/binding/unbinding/deleting exchanges and queues are
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all done with the above AmqpClient::Channel object. If one of these commands
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fails to complete a AmqpClient::ChannelException will be thrown, which can be caught
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and the AmqpClient::Channel object is still useable. If a more severe error occurs
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a AmqpClient::ConnectionException or AmqpClient::AmqpResponseLibraryException maybe
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thrown, in which case the Channel object is no longer in a usable state and further
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use will only generate more exceptions.
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Consuming messages is done by setting up a consumer using the BasicConsume method.
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This method returns a consumer tag that should be used with the BasicConsumeMessage
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BasicQos, BasicRecover, and BasicCancel.
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std::string consumer_tag = channel->BasicConsume("my_queue", "");
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Envelope::ptr_t envelope = channel->BasicConsumeMessage(consumer_tag);
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// Alternatively:
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Envelope::ptr_t envelope;
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channel->BasicConsumeMessage(consumer_tag, envelope, 10); // 10 ms timeout
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// To ack:
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channel->BasicAck(envelope);
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// To cancel:
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channel->BasicCancel(consumer_tag);
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