Calculator provides an interface for client components to request compute operations over IPC using FIDL. The calculator sample has three parts: the engine, a client, and a library defining a FIDL communication protocol between the components.
fidl/: Contains the definition of a Fuchsia interprocess communication (IPC) protocol (
fuchsia.examples.calculator.Calculator) defined as a Fuchsia Interface Definition Language (FIDL) library. The
BUILD.gnfile describes how to build the FIDL library that can be used as a dependency for the client and engine.
engine/: Contains the source for the calculator engine that accepts compute operations and sends the results back. The engine handles incoming requests as FIDL messages received from the client.
client/: Contains the source for the client that sends compute requests to the calculator engine then prints the results to the system log.
meta/: Top-level component realm to perform capability routing between the engine and client components.
Start a FEMU instance:
$ ./third_party/fuchsia-sdk/bin/femu.sh -N
Start a local package repository instance:
$ ./third_party/fuchsia-sdk/bin/fserve.sh --image qemu-x64
Run the build script to compile and package the sample:
Publish the FAR package to your local package repository:
$ ./third_party/fuchsia-sdk/bin/fpublish.sh out/x64/calculator-example.far
Launch the sample component using
ffx component run. This resolves the component from the package repository and starts it:
$ ffx component run fuchsia-pkg://fuchsia.com/calculator-example#meta/calculator_realm.cm
View the result messages in the system log using
ffx target log:
$ ffx target log watch [calculator_realm/client] INFO: Request: 2 + 2 [calculator_realm/client] INFO: Result: 4
Execute the unit test suite using
ffx test run. This resolves the component from the package repository and executes the tests:
$ ffx test run fuchsia-pkg://fuchsia.com/engine_unittest#meta/engine_unittest.cm
Verify that the test cases pass:
Running test 'fuchsia-pkg://fuchsia.com/engine_unittest#meta/engine_unittest.cm' [RUNNING] main [stdout - main] Running main() from ../../third_party/googletest/src/googletest/src/gtest_main.cc [==========] Running 5 tests from 1 test suite. [----------] Global test environment set-up. [----------] 5 tests from EngineUnitTest [ RUN ] EngineUnitTest.Negate [ OK ] EngineUnitTest.Negate (11 ms) [ RUN ] EngineUnitTest.Add [ OK ] EngineUnitTest.Add (12 ms) [ RUN ] EngineUnitTest.Subtract [ OK ] EngineUnitTest.Subtract (12 ms) [ RUN ] EngineUnitTest.Multiply [ OK ] EngineUnitTest.Multiply (11 ms) [ RUN ] EngineUnitTest.Divide [ OK ] EngineUnitTest.Divide (11 ms) [----------] 5 tests from EngineUnitTest (60 ms total) [----------] Global test environment tear-down [==========] 5 tests from 1 test suite ran. (66 ms total) [ PASSED ] 5 tests. [PASSED] main 1 out of 1 tests passed... fuchsia-pkg://fuchsia.com/engine_unittest#meta/engine_unittest.cm completed with result: PASSED