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| <h2 title="Annotation Type AsynchronouslyFormattable" class="title">Annotation Type AsynchronouslyFormattable</h2> |
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| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Documented.html?is-external=true" title="class or interface in java.lang.annotation">@Documented</a> |
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| public @interface <a href="../../../../../src-html/org/apache/logging/log4j/message/AsynchronouslyFormattable.html#line.59">AsynchronouslyFormattable</a></pre> |
| <div class="block">Annotation that signals to asynchronous logging components that messages of this type can safely be passed to |
| a background thread without calling <a href="../../../../../org/apache/logging/log4j/message/Message.html#getFormattedMessage--"><code>Message.getFormattedMessage()</code></a> first. |
| <p> |
| Generally, logging mutable objects asynchronously always has the risk that the object is modified between the time |
| the logger is called and the time the log message is formatted and written to disk. Strictly speaking it is the |
| responsibility of the application to ensure that mutable objects are not modified after they have been logged, |
| but this is not always possible. |
| </p><p> |
| Log4j prevents the above race condition as follows: |
| </p><ol> |
| <li>If the Message implements <a href="../../../../../org/apache/logging/log4j/message/ReusableMessage.html" title="interface in org.apache.logging.log4j.message"><code>ReusableMessage</code></a>, asynchronous logging components in the Log4j implementation |
| will copy the message content (formatted message, parameters) onto the queue rather than passing the |
| <code>Message</code> instance itself. This ensures that the formatted message will not change |
| when the mutable object is modified. |
| </li> |
| <li>If the Message is annotated with <a href="../../../../../org/apache/logging/log4j/message/AsynchronouslyFormattable.html" title="annotation in org.apache.logging.log4j.message"><code>AsynchronouslyFormattable</code></a>, it can be passed to another thread as is.</li> |
| <li>Otherwise, asynchronous logging components in the Log4j implementation will call |
| <a href="../../../../../org/apache/logging/log4j/message/Message.html#getFormattedMessage--"><code>Message.getFormattedMessage()</code></a> before passing the Message object to another thread. |
| This gives the Message implementation class a chance to create a formatted message String with the current value |
| of the mutable object. The intention is that the Message implementation caches this formatted message and returns |
| it on subsequent calls. |
| (See <a href="https://issues.apache.org/jira/browse/LOG4J2-763">LOG4J2-763</a>.) |
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| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.8</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/logging/log4j/message/Message.html" title="interface in org.apache.logging.log4j.message"><code>Message</code></a>, |
| <a href="../../../../../org/apache/logging/log4j/message/ReusableMessage.html" title="interface in org.apache.logging.log4j.message"><code>ReusableMessage</code></a>, |
| <a href="https://issues.apache.org/jira/browse/LOG4J2-763">LOG4J2-763</a></dd> |
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