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| <div class="subTitle">org.eclipse.microprofile.config.spi</div> |
| <h2 title="Interface ConfigSource" class="title">Interface ConfigSource</h2> |
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| <pre>public interface <span class="typeNameLabel">ConfigSource</span></pre> |
| <div class="block"><p>Implement this interfaces to provide a ConfigSource. |
| A ConfigSource provides configuration values from a specific place, like JNDI configuration, a properties file, etc. |
| A ConfigSource is always read-only, any potential updates of the configured values must be handled directly inside each ConfigSource. |
| |
| <p> |
| The default config sources always available by default are: |
| <ol> |
| <li>System properties (ordinal=400)</li> |
| <li>Environment properties (ordinal=300)</li> |
| <li>/META-INF/microprofile-config.properties (ordinal=100)</li> |
| </ol> |
| |
| <p>Custom ConfigSource will get picked up via the <code>ServiceLoader</code> mechanism and and can be registered by |
| providing a file |
| <pre> |
| META-INF/services/org.eclipse.microprofile.config.spi.ConfigSource |
| </pre> |
| which contains the fully qualified <code>ConfigSource</code> implementation class name as content. |
| |
| <p>Adding a dynamic amount of custom config sources can be done programmatically via |
| <a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSourceProvider.html" title="interface in org.eclipse.microprofile.config.spi"><code>ConfigSourceProvider</code></a>.</div> |
| </li> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSource.html#CONFIG_ORDINAL">CONFIG_ORDINAL</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSource.html#DEFAULT_ORDINAL">DEFAULT_ORDINAL</a></span></code> </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSource.html#getName--">getName</a></span>()</code> |
| <div class="block">The name of the config might be used for logging or analysis of configured values.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>default int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSource.html#getOrdinal--">getOrdinal</a></span>()</code> |
| <div class="block">Return the ordinal for this config source.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>java.util.Map<java.lang.String,java.lang.String></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSource.html#getProperties--">getProperties</a></span>()</code> |
| <div class="block">Return the properties in this config source</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>default java.util.Set<java.lang.String></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSource.html#getPropertyNames--">getPropertyNames</a></span>()</code> |
| <div class="block">Gets all property names known to this config source, without evaluating the values.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/eclipse/microprofile/config/spi/ConfigSource.html#getValue-java.lang.String-">getValue</a></span>(java.lang.String propertyName)</code> |
| <div class="block">Return the value for the specified property in this config source.</div> |
| </td> |
| </tr> |
| </table> |
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| <h4>CONFIG_ORDINAL</h4> |
| <pre>static final java.lang.String CONFIG_ORDINAL</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../constant-values.html#org.eclipse.microprofile.config.spi.ConfigSource.CONFIG_ORDINAL">Constant Field Values</a></dd> |
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| <h4>DEFAULT_ORDINAL</h4> |
| <pre>static final int DEFAULT_ORDINAL</pre> |
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| <dd><a href="../../../../../constant-values.html#org.eclipse.microprofile.config.spi.ConfigSource.DEFAULT_ORDINAL">Constant Field Values</a></dd> |
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| <h4>getProperties</h4> |
| <pre>java.util.Map<java.lang.String,java.lang.String> getProperties()</pre> |
| <div class="block">Return the properties in this config source</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the map containing the properties in this config source</dd> |
| </dl> |
| </li> |
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| <h4>getPropertyNames</h4> |
| <pre>default java.util.Set<java.lang.String> getPropertyNames()</pre> |
| <div class="block">Gets all property names known to this config source, without evaluating the values. |
| |
| For backwards compatibility, there is a default implementation that just returns the keys of <code>getProperties()</code> |
| slower ConfigSource implementations should replace this with a more performant implementation</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the set of property keys that are known to this ConfigSource</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getOrdinal</h4> |
| <pre>default int getOrdinal()</pre> |
| <div class="block">Return the ordinal for this config source. If a property is specified in multiple config sources, the value |
| in the config source with the highest ordinal takes precedence. |
| For the config sources with the same ordinal value, the config source names will |
| be used for sorting according to string sorting criteria. |
| Note that this property only gets evaluated during ConfigSource discovery. |
| |
| The default ordinals for the default config sources: |
| <ol> |
| <li>System properties (ordinal=400)</li> |
| <li>Environment properties (ordinal=300) |
| <p>Some operating systems allow only alphabetic characters or an underscore(_), in environment variables. |
| Other characters such as ., /, etc may be disallowed. |
| In order to set a value for a config property that has a name containing such disallowed characters from an environment variable, |
| the following rules are used. |
| This ConfigSource searches for potentially 3 environment variables with a given property name (e.g. <code>"com.ACME.size"</code>):</p> |
| <ol> |
| <li>Exact match (i.e. <code>"com.ACME.size"</code>)</li> |
| <li>Replace the character that is neither alphanumeric nor '_' with '_' (i.e. <code>"com_ACME_size"</code>)</li> |
| <li>Replace the character that is neither alphanumeric nor '_' with '_' and convert to upper case |
| (i.e. <code>"COM_ACME_SIZE"</code>)</li> |
| </ol> |
| <p>The first environment variable that is found is returned by this ConfigSource.</p> |
| </li> |
| <li>/META-INF/microprofile-config.properties (default ordinal=100)</li> |
| </ol> |
| |
| |
| Any ConfigSource part of an application will typically use an ordinal between 0 and 200. |
| ConfigSource provided by the container or 'environment' typically use an ordinal higher than 200. |
| A framework which intends have values overwritten by the application will use ordinals between 0 and 100. |
| The property "config_ordinal" can be specified to override the default value.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the ordinal value</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getValue</h4> |
| <pre>java.lang.String getValue(java.lang.String propertyName)</pre> |
| <div class="block">Return the value for the specified property in this config source.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>propertyName</code> - the property name</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the property value</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getName</h4> |
| <pre>java.lang.String getName()</pre> |
| <div class="block">The name of the config might be used for logging or analysis of configured values.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the 'name' of the configuration source, e.g. 'property-file mylocation/myproperty.properties'</dd> |
| </dl> |
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