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| org.apache.http.annotation</FONT> |
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| Annotation Type Immutable</H2> |
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| <DL> |
| <DT><PRE><FONT SIZE="-1"><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Documented.html" title="class or interface in java.lang.annotation">@Documented</A> |
| <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Target.html" title="class or interface in java.lang.annotation">@Target</A>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Target.html#value()" title="class or interface in java.lang.annotation">value</A>=<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/ElementType.html#TYPE" title="class or interface in java.lang.annotation">TYPE</A>) |
| <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Retention.html" title="class or interface in java.lang.annotation">@Retention</A>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/Retention.html#value()" title="class or interface in java.lang.annotation">value</A>=<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/annotation/RetentionPolicy.html#CLASS" title="class or interface in java.lang.annotation">CLASS</A>) |
| </FONT>public @interface <B>Immutable</B></DL> |
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| |
| <P> |
| The class to which this annotation is applied is immutable. This means that |
| its state cannot be seen to change by callers, which implies that |
| <ul> |
| <li> all public fields are final, </li> |
| <li> all public final reference fields refer to other immutable objects, and </li> |
| <li> constructors and methods do not publish references to any internal state |
| which is potentially mutable by the implementation. </li> |
| </ul> |
| Immutable objects may still have internal mutable state for purposes of performance |
| optimization; some state variables may be lazily computed, so long as they are computed |
| from immutable state and that callers cannot tell the difference. |
| <p> |
| Immutable objects are inherently thread-safe; they may be passed between threads or |
| published without synchronization. |
| <p> |
| Based on code developed by Brian Goetz and Tim Peierls and concepts |
| published in 'Java Concurrency in Practice' by Brian Goetz, Tim Peierls, |
| Joshua Bloch, Joseph Bowbeer, David Holmes and Doug Lea. |
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