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| <div class="subTitle">org.eclipse.microprofile.config.inject</div> |
| <h2 title="Annotation Type ConfigProperty" class="title">Annotation Type ConfigProperty</h2> |
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| <pre>@Retention(value=RUNTIME) |
| @Target(value={METHOD,FIELD,PARAMETER,TYPE}) |
| public @interface <span class="memberNameLabel">ConfigProperty</span></pre> |
| <div class="block"><p> |
| Binds the injection point with a configured value. |
| Can be used to annotate injection points of type <code>TYPE</code>, <code>Optional<TYPE></code> or <code>javax.inject.Provider<TYPE></code>, |
| where <code>TYPE</code> can be <code>String</code> and all types which have appropriate converters. |
| <p> |
| Injected values are the same values that would be retrieved from an injected <a href="../../../../../org/eclipse/microprofile/config/Config.html" title="interface in org.eclipse.microprofile.config"><code>Config</code></a> instance |
| or from the instance retrieved from <a href="../../../../../org/eclipse/microprofile/config/ConfigProvider.html#getConfig--"><code>ConfigProvider.getConfig()</code></a> |
| |
| <h2>Examples</h2> |
| |
| <h3>Injecting Native Values</h3> |
| |
| The first sample injects the configured value of the <code>my.long.property</code> property. |
| The injected value does not change even if the underline |
| property value changes in the <a href="../../../../../org/eclipse/microprofile/config/Config.html" title="interface in org.eclipse.microprofile.config"><code>Config</code></a>. |
| |
| <p>Injecting a native value is recommended for a mandatory property and its value does not change at runtime or used by a bean with RequestScoped. |
| <p>A further recommendation is to use the built in <code>META-INF/microprofile-config.properties</code> file mechanism |
| to provide default values inside an Application. |
| If no configured value exists for this property, a <code>DeplymentException</code> will be thrown during startup. |
| <pre> |
| @Inject |
| @ConfigProperty(name="my.long.property") |
| private Long injectedLongValue; |
| </pre> |
| |
| |
| <h3>Injecting Optional Values</h3> |
| |
| |
| Contrary to natively injecting, if the property is not specified, this will not lead to a DeploymentException. |
| The following code injects a Long value to the <code>my.optional.long.property</code>. |
| If the property does not exist, the value <code>123</code> will be assigned. |
| to <code>injectedLongValue</code>. |
| <pre> |
| @Inject |
| @ConfigProperty(name="my.optional.long.property", defaultValue="123") |
| private Long injectedLongValue; |
| </pre> |
| The following code injects an Optional value of <code>my.optional.int.property</code>. |
| <pre> |
| @Inject |
| @ConfigProperty(name = "my.optional.int.property") |
| private Optional<Integer> intConfigValue; |
| </pre> |
| |
| <h3>Injecting Dynamic Values</h3> |
| |
| The next sample injects a Provider for the value of <code>my.long.property</code> property to resolve the property dynamically. |
| Each invocation to <code>Provider#get()</code> will resolve the latest value from underlying <a href="../../../../../org/eclipse/microprofile/config/Config.html" title="interface in org.eclipse.microprofile.config"><code>Config</code></a> again. |
| The existence of configured values will get checked during startup. |
| Instances of <code>Provider<T></code> are guaranteed to be Serializable. |
| <pre> |
| @Inject |
| @ConfigProperty(name = "my.long.property" defaultValue="123") |
| private Provider<Long> longConfigValue; |
| </pre> |
| |
| <p>If <code>ConfigProperty</code> is used with a type where no <a href="../../../../../org/eclipse/microprofile/config/spi/Converter.html" title="interface in org.eclipse.microprofile.config.spi"><code>Converter</code></a> exists, |
| a deployment error will be thrown.</div> |
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| <td class="colFirst"><code>static java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/inject/ConfigProperty.html#UNCONFIGURED_VALUE">UNCONFIGURED_VALUE</a></span></code> </td> |
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| <caption><span>Optional Elements</span><span class="tabEnd"> </span></caption> |
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| <th class="colLast" scope="col">Optional Element and Description</th> |
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| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/inject/ConfigProperty.html#defaultValue--">defaultValue</a></span></code> |
| <div class="block">The default value if the configured property value does not exist.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/inject/ConfigProperty.html#name--">name</a></span></code> |
| <div class="block">The key of the config property used to look up the configuration value.</div> |
| </td> |
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| <h4>UNCONFIGURED_VALUE</h4> |
| <pre>public static final java.lang.String UNCONFIGURED_VALUE</pre> |
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| <h4>name</h4> |
| <pre>public abstract java.lang.String name</pre> |
| <div class="block">The key of the config property used to look up the configuration value. |
| If it is not specified, it will be derived automatically as <code><class_name>.<injetion_point_name></code>, |
| where <code>injection_point_name</code> is the field name or parameter name, |
| <code>class_name</code> is the fully qualified name of the class being injected to. |
| If one of the <code>class_name</code> or <code>injection_point_name</code> cannot be determined, the value has to be provided.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Name (key) of the config property to inject</dd> |
| </dl> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
| </dl> |
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| <h4>defaultValue</h4> |
| <pre>public abstract java.lang.String defaultValue</pre> |
| <div class="block"><p>The default value if the configured property value does not exist. |
| |
| <p>If the target Type is not String a proper <a href="../../../../../org/eclipse/microprofile/config/spi/Converter.html" title="interface in org.eclipse.microprofile.config.spi"><code>Converter</code></a> will get applied. |
| That means that any default value string should follow the formatting rules of the registered Converters.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the default value as a string</dd> |
| </dl> |
| <dl> |
| <dt>Default:</dt> |
| <dd>"org.eclipse.microprofile.config.configproperty.unconfigureddvalue"</dd> |
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