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| <h1 id="intro">Intro</h1> |
| <p>These examples shows howto create and interact with services by example.</p> |
| <p>In both examples there is a provider and consumer bundle. |
| The provider bundle creates services and registers them to the Celix framework so that these services are available for use. |
| And the consumer bundle request the services from the Celix framework and uses them.</p> |
| <p>The examples use the <code>celix_bundleContext_registerService</code> to provide |
| services and uses a combination of <code>celix_bundleContext_useService</code>, |
| <code>celix_bundleContext_useServices</code> and <code>celix_bundleContext_trackServices</code> |
| to consume services.</p> |
| <p>The bundle context is the proxy to the Celix framework for a bundle |
| and can be used to:</p> |
| <ul> |
| <li>Register services</li> |
| <li>Register service factories</li> |
| <li>Use services</li> |
| <li>Track services</li> |
| <li>Track bundles</li> |
| <li>Track service trackers</li> |
| </ul> |
| <p>See the <code>bundle_context.h</code> for documentation about these - and other -functions</p> |
| <h1 id="simple-service-provider--consumer-example">Simple Service Provider & Consumer Example</h1> |
| <p>The simple provider/consumer example can be executed by launching the |
| <code>services_example_c</code> executable target |
| (build in the directory <code>${CMAKE_BUILD_DIR}/deploy/c_examples/services_example_c</code>)</p> |
| <p>In this example the provider bundle only registers 1 calc service. And |
| the consumer bundle tries to use this during startup and registered |
| a service tracker for the calc service.</p> |
| <pre tabindex="0"><code class="language-ditaa" data-lang="ditaa">+----------------------+ +------------------------+ |
| | | | | |
| | | | | |
| | provider_example | example_calc | consumer_example | |
| | +--------O)--------+ | |
| | <bundle> | | <bundle> | |
| | | | | |
| | | | | |
| +----------------------+ +------------------------+ |
| </code></pre><p>Try stopping/starting the provider/consumer bundles (respectively bundle id 3 & 4) using the interactive shell |
| to see how this works at runtime. |
| I.e. type <code>stop 3</code>, <code>stop 4</code>, <code>start 3</code>, <code>start 4</code> in different combinations.</p> |
| <h1 id="dynamic-service-provider--consumer-example">Dynamic Service Provider & Consumer Example</h1> |
| <p>The dynamic provider/consumer example can be executed by launching the |
| <code>dynamic_services_example_c</code> executable target |
| (build in <code>${CMAKE_BUILD_DIR}/deploy/c_examples/dynamic_services_example_c</code>)</p> |
| <p>The dynamic service provide / consumer example show how the framework copes |
| with the dynamic behaviour of services.</p> |
| <p>This this example the provided dynamically register more and less calc services in a thread. |
| The consumer bundle uses these services in a every 5 seconds and print some info.</p> |
| <p>This example should give an idea how services can be safely used and tracked in a dynamic environment.</p> |
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