org.dom4j.util: public class: PerThreadSingleton

org.dom4j.util
public class: PerThreadSingleton [javadoc | source]

java.lang.Object
   org.dom4j.util.PerThreadSingleton

All Implemented Interfaces:
SingletonStrategy

PerThreadSingleton is an implementation of the SingletonStrategy used to provide common factory access to a single object instance based on an implementation strategy for one object instance per thread. This is useful in replace of the ThreadLocal usage.

author: < - a href="mailto:ddlucas@users.sourceforge.net">David Lucas

version: $ - Revision: 1.3 $

Constructor:
public PerThreadSingleton() { }

Method from org.dom4j.util.PerThreadSingleton Summary:
instance, reset, setSingletonClassName

Methods from java.lang.Object:
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from org.dom4j.util.PerThreadSingleton Detail:
public Object instance() { Object singletonInstancePerThread = null; // use weak reference to prevent cyclic reference during GC WeakReference ref = (WeakReference) perThreadCache.get(); // singletonInstancePerThread=perThreadCache.get(); // if (singletonInstancePerThread==null) { if (ref == null \|\| ref.get() == null) { Class clazz = null; try { clazz = Thread.currentThread().getContextClassLoader().loadClass( singletonClassName); singletonInstancePerThread = clazz.newInstance(); } catch (Exception ignore) { try { clazz = Class.forName(singletonClassName); singletonInstancePerThread = clazz.newInstance(); } catch (Exception ignore2) { } } perThreadCache.set(new WeakReference(singletonInstancePerThread)); } else { singletonInstancePerThread = ref.get(); } return singletonInstancePerThread; }
public void reset() { perThreadCache = new ThreadLocal(); }
public void setSingletonClassName(String singletonClassName) { this.singletonClassName = singletonClassName; }

Method from org.dom4j.util.PerThreadSingleton Detail:

 public Object instance() {
        Object singletonInstancePerThread = null;
        // use weak reference to prevent cyclic reference during GC
        WeakReference ref = (WeakReference) perThreadCache.get();
        // singletonInstancePerThread=perThreadCache.get();
        // if (singletonInstancePerThread==null) {
        if (ref == null || ref.get() == null) {
            Class clazz = null;
            try {
                clazz = Thread.currentThread().getContextClassLoader().loadClass(
                        singletonClassName);
                singletonInstancePerThread = clazz.newInstance();
            } catch (Exception ignore) {
                try {
                    clazz = Class.forName(singletonClassName);
                    singletonInstancePerThread = clazz.newInstance();
                } catch (Exception ignore2) {
                }
            }
            perThreadCache.set(new WeakReference(singletonInstancePerThread));
        } else {
            singletonInstancePerThread = ref.get();
        }
        return singletonInstancePerThread;
}

 public  void reset() {
        perThreadCache = new ThreadLocal();
}

 public  void setSingletonClassName(String singletonClassName) {
        this.singletonClassName = singletonClassName;
}