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| <h1 id="intro">Intro</h1> |
| <p>These examples show 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 <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>Use services</li> |
| <li>Track services</li> |
| <li>Track bundles</li> |
| <li>Track service trackers</li> |
| </ul> |
| <p>See the <code>celix/BundleContext.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>SimpleServicesExample</code> executable target |
| (build in <code>${CMAKE_BUILD_DIR}/deploy/cxx_examples/SimpleServicesExample</code>)</p> |
| <p>In this example the provider bundle only register one calc service. And |
| the consumer bundle uses this service with use of a service tracker.</p> |
| <pre tabindex="0"><code class="language-ditaa" data-lang="ditaa">+----------------------+ +------------------------+ |
| | | | | |
| | | | | |
| | SimpleProvider | examples::ICalc | SimpleConsumer | |
| | +--------O)--------+ | |
| | <bundle> | | <bundle> | |
| | | | | |
| | | | | |
| +----------------------+ +------------------------+ |
| </code></pre><p>The effect of this can be examed by stopping and starting the provider/consumer bundles (respectively bundle id 3 & 4) using the interactive shell |
| to see how this works at runtime. |
| I.e. type <code>stop 3</code>, <code>stop 4</code>, <code>start 3</code>, <code>start 4</code> in different combinations.</p> |
| <h1 id="dynamic-service-provider--consumer-example">Dynamic Service Provider & Consumer Example</h1> |
| <p>The dynamic provider/consumer example can be executed by launching the |
| <code>DynamicServicesExample</code> executable target |
| (build in <code>${CMAKE_BUILD_DIR}/deploy/cxx_examples/DynamicServicesExample</code>)</p> |
| <p>The dynamic service provide / consumer example show howto handle the dynamic behavior |
| of services.</p> |
| <p>In this example the provider dynamically register more and less ICalc services in a thread. |
| The consumer create and destroy consumer for the ICalc services.</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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