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FairMQ/examples/MQ/2-sampler-processor-sink
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Alexey Rybalchenko da10c64800 Enable new callback API 
- OnData() channel data handler.
 - ConditionalRun() for devices without incoming data.
 - Header file with common main(), to be extended with getDevice/addCustomOptions.
 - Update examples (MQ/Tutorial3) to use the new API and config.
 - NewSimpleMessage() for simpler creation of small messages (additional copy).
 - Replace SetProperty/GetProperty with fConfig access.
 - Runtime configurable channel names for common devices.
 - Configurable logging interval per channel.
 - FairMQMultiplier for distributing same data to multiple outputs.
 - Cleanup state machine messages.
 - Cmd option to toggle signal handling.
 - Simpler API for send/receive timeouts.
 - Enable --log-to-file.
 - Fix coverity issues, warnings.
 - Various code cleanup and minor tweaks.
2018-05-02 16:12:57 +02:00
..
CMakeLists.txt Modified the ROOTMacros.cmake to allow GENERATE_EXECUTABLE() 2018-05-02 16:12:57 +02:00
ex2-sampler-processor-sink.json Configuration and DDS example/tools updates 2018-05-02 16:12:57 +02:00
FairMQExample2Processor.cxx Enable new callback API 2018-05-02 16:12:57 +02:00
FairMQExample2Processor.h Enable new callback API 2018-05-02 16:12:57 +02:00
FairMQExample2Sampler.cxx Enable new callback API 2018-05-02 16:12:57 +02:00
FairMQExample2Sampler.h Enable new callback API 2018-05-02 16:12:57 +02:00
FairMQExample2Sink.cxx Enable new callback API 2018-05-02 16:12:57 +02:00
FairMQExample2Sink.h Enable new callback API 2018-05-02 16:12:57 +02:00
README.md Configuration and DDS example/tools updates 2018-05-02 16:12:57 +02:00
runExample2Processor.cxx Enable new callback API 2018-05-02 16:12:57 +02:00
runExample2Sampler.cxx Enable new callback API 2018-05-02 16:12:57 +02:00
runExample2Sink.cxx Enable new callback API 2018-05-02 16:12:57 +02:00
startMQEx2.sh.in Modified the ROOTMacros.cmake to allow GENERATE_EXECUTABLE() 2018-05-02 16:12:57 +02:00

README.md

Example 2: Sampler -> Processor -> Sink

A simple topology of three devices - Sampler, Processor and Sink. Sampler sends data to one or more Processors, who modify the data and send it to one Sink. Transport with the PUSH-PULL pattern.

For this example both processor devices share same configuration, and can therefore use same setting from the JSON file. But since their ID still has to be unique, additional command line argument must be used to allow them to share configuration. This parameter is --config-key.

In this example the Sampler is configured to bind its output and the Sink is configured to also bind its input. This allows us run any number of processors with the same configuration, because they all connect to same Sampler and Sink addresses. Furthermore, it allows adding of processors dynamically during run-time. The PUSH and PULL sockets will handle the data distribution to/from the new devices according to their distribution strategies (Round-robin output for PUSH and Fair-queued input for PULL).

The Sampler sends out a simple text string (its content configurable with --text command line parameter, defaul is "Hello"). Each Processor modifies the string by appending its ID to it and send it to the Sink.

The provided configuration file contains two Processors. To add more Processors, you can either extend the configuration file, or create a separate file only for new processors.