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| <h1 title="Package" class="title">Package org.eclipse.microprofile.config</h1> |
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| <div class="block">Configuration for Java Microprofile</div> |
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| <p>See: <a href="#package.description">Description</a></p> |
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| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/config/Config.html" title="interface in org.eclipse.microprofile.config">Config</a></td> |
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| Resolves the property value by searching through all configured |
| <a href="../../../../org/eclipse/microprofile/config/spi/ConfigSource.html" title="interface in org.eclipse.microprofile.config.spi"><code>ConfigSources</code></a>.</div> |
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| <td class="colFirst"><a href="../../../../org/eclipse/microprofile/config/ConfigProvider.html" title="class in org.eclipse.microprofile.config">ConfigProvider</a></td> |
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| <div class="block"> |
| This is the central class to access a <a href="../../../../org/eclipse/microprofile/config/Config.html" title="interface in org.eclipse.microprofile.config"><code>Config</code></a>.</div> |
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| <h2 title="Package org.eclipse.microprofile.config Description">Package org.eclipse.microprofile.config Description</h2> |
| <div class="block"><p>Configuration for Java Microprofile |
| |
| <h2>Rational</h2> |
| |
| <p>For many project artifacts (e.g. WAR, EAR) it should be possible to build them only once |
| and then install them at different customers, stages, etc. |
| They need to target those different execution environments without the necessity of any repackaging. |
| In other words: depending on the situation they need different configuration. |
| |
| <p>This is easily achievable by having a set of default configuration values inside the project artifact. |
| But be able to overwrite those default values from external. |
| |
| <h2>How it works</h2> |
| |
| <p>A 'Configuration' consists of the information collected from the registered |
| <a href="../../../../org/eclipse/microprofile/config/spi/ConfigSource.html" title="interface in org.eclipse.microprofile.config.spi"><code>ConfigSources</code></a>. |
| These <code>ConfigSources</code> get sorted according to their <i>ordinal</i>. |
| That way it is possible to overwrite configuration with lower importance from outside. |
| |
| <p>By default there are 3 ConfigSources: |
| |
| <ul> |
| <li><code>System.getenv()</code> (ordinal=400)</li> |
| <li><code>System.getProperties()</code> (ordinal=300)</li> |
| <li>all <code>META-INF/microprofile-config.properties</code> files on the ClassPath. |
| (ordinal=100, separately configurable via a config_ordinal property inside each file)</li> |
| </ul> |
| |
| <p>That means that one can put the default configuration in a <code>META-INF/microprofile-config.properties</code> anywhere on the classpath. |
| and the Operations team can later simply e.g set a system property to change this default configuration. |
| |
| <p>It is of course also possible to register own <a href="../../../../org/eclipse/microprofile/config/spi/ConfigSource.html" title="interface in org.eclipse.microprofile.config.spi"><code>ConfigSources</code></a>. |
| A <code>ConfigSource</code> could e.g. read configuration values from a database table, a remote server, etc |
| |
| <h2>Accessing and Using the Configuration</h2> |
| |
| <p> The configuration of an application is represented by an instance of <a href="../../../../org/eclipse/microprofile/config/Config.html" title="interface in org.eclipse.microprofile.config"><code>Config</code></a>. |
| The <a href="../../../../org/eclipse/microprofile/config/Config.html" title="interface in org.eclipse.microprofile.config"><code>Config</code></a> can be accessed via the <a href="../../../../org/eclipse/microprofile/config/ConfigProvider.html" title="class in org.eclipse.microprofile.config"><code>ConfigProvider</code></a>. |
| |
| <pre> |
| Config config = ConfigProvider.getConfig(); |
| String restUrl = config.getValue("myproject.some.endpoint.url", String.class); |
| </pre> |
| |
| <p> Of course we also support injection via a JSR-330 DI container: |
| <pre> |
| @Inject |
| @ConfigProperty(name="myproject.some.endpoint.url"); |
| private String restUrl; |
| </pre></div> |
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