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| <h2 title="Interface SingletonCustomizer" class="title">Interface SingletonCustomizer</h2> |
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| <pre>public interface <span class="typeNameLabel">SingletonCustomizer</span></pre> |
| <div class="block">Marker interface useful when used together with <a href="../../../freemarker/ext/beans/MethodAppearanceFineTuner.html" title="interface in freemarker.ext.beans"><code>MethodAppearanceFineTuner</code></a> and such customizer objects, to |
| indicate that it <b>doesn't contain reference to the <a href="../../../freemarker/template/ObjectWrapper.html" title="interface in freemarker.template"><code>ObjectWrapper</code></a></b> (so beware with non-static inner |
| classes) and can be and should be used in call introspection cache keys. This also implies that you won't |
| create many instances of the class, rather just reuse the same (or same few) instances over and over. Furthermore, |
| the instances must be thread-safe. The typical pattern in which this instance should be used is like this: |
| |
| <pre>static class MyMethodAppearanceFineTuner implements MethodAppearanceFineTuner, SingletonCustomizer { |
| |
| // This is the singleton: |
| static final MyMethodAppearanceFineTuner INSTANCE = new MyMethodAppearanceFineTuner(); |
| |
| // Private, so it can't be constructed from outside this class. |
| private MyMethodAppearanceFineTuner() { } |
| |
| @Override |
| public void fineTuneMethodAppearance(...) { |
| // Do something here, only using the parameters and maybe some other singletons. |
| ... |
| } |
| |
| }</pre></div> |
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| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.3.21</dd> |
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