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<h2 title="Annotation Type Independent" class="title">Annotation Type Independent</h2>
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<pre>@Documented
@Retention(value=RUNTIME)
@Target(value={TYPE,METHOD})
public @interface <span class="strong">Independent</span></pre>
<div class="block">A hint for a dependent <a href="../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado"><code>Repository</code></a> to allow a <a href="../../../com/amazon/carbonado/Storable.html" title="interface in com.amazon.carbonado"><code>Storable</code></a> property or type
to be undefined in the underlying schema. Ordinarily, if a dependent repository cannot
find a matching property, it throws <a href="../../../com/amazon/carbonado/MismatchException.html" title="class in com.amazon.carbonado"><code>MismatchException</code></a> when the <a href="../../../com/amazon/carbonado/Storage.html" title="interface in com.amazon.carbonado"><code>Storage</code></a> is
first retrieved for the storable. This annotation suppresses that exception, and instead
makes the property or type unsupported. Any subsequent invocation of a property access
method for the independent type or property will cause an UnsupportedOperationException
to be thrown.
<p>One example of when this might be used would be to store a calculated
field in the cached representation of the object. It is <b>not</b>
necessary to prevent implemented methods of the form "get<value>"
from being inadvertently interpreted as properties of the storable; any
implementation is by definition not a property.
<p>If a correctly matching property actually is found, then this annotation
is ignored and the property or type is defined as usual. If the Repository
finds a property whose name matches, but whose type does not match, a
MismatchException will be thrown regardless of this annotation.
<p>Independent repositories completely ignore this annotation.
<p>Example:<pre>
public interface UserInfo extends Storable<UserInfo> {
<b>@Independent</b>
String getName();
void setName(String name);
...
}
</pre>
<b>Note:</b> If a <a href="../../../com/amazon/carbonado/Version.html" title="annotation in com.amazon.carbonado"><code>versioned</code></a> Storable with an independent
property is managed by a replicating repository, updates which modify just
the independent property still update the master Storable, in order to get a
new record version. Therefore, independent properties should not be used as
a performance enhancement which avoids writes to a master repository.</div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Brian S O'Neill</dd></dl>
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