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Refactored BTraceEngine listeners to an appropriate class (btraceio#361)
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51 changes: 51 additions & 0 deletions
51
src/share/classes/com/sun/btrace/api/impl/BTraceEngineListeners.java
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package com.sun.btrace.api.impl; | ||
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import com.sun.btrace.api.BTraceTask; | ||
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import java.lang.ref.WeakReference; | ||
import java.util.HashSet; | ||
import java.util.Iterator; | ||
import java.util.Set; | ||
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class BTraceEngineListeners { | ||
private final Set<WeakReference<BTraceEngineImpl.StateListener>> listeners = new HashSet<WeakReference<BTraceEngineImpl.StateListener>>(); | ||
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BTraceEngineListeners() { | ||
} | ||
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void addListener(BTraceEngineImpl.StateListener listener) { | ||
synchronized (listeners) { | ||
listeners.add(new WeakReference<BTraceEngineImpl.StateListener>(listener)); | ||
} | ||
} | ||
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void removeListener(BTraceEngineImpl.StateListener listener) { | ||
synchronized (listeners) { | ||
for (Iterator<WeakReference<BTraceEngineImpl.StateListener>> iter = listeners.iterator(); iter.hasNext(); ) { | ||
WeakReference<BTraceEngineImpl.StateListener> ref = iter.next(); | ||
BTraceEngineImpl.StateListener l = ref.get(); | ||
if (l == null || l.equals(listener)) { | ||
iter.remove(); | ||
} | ||
} | ||
} | ||
} | ||
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void fireOnTaskStart(BTraceTask task) { | ||
synchronized (listeners) { | ||
for (WeakReference<BTraceEngineImpl.StateListener> ref : listeners) { | ||
BTraceEngineImpl.StateListener l = ref.get(); | ||
if (l != null) l.onTaskStart(task); | ||
} | ||
} | ||
} | ||
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void fireOnTaskStop(BTraceTask task) { | ||
synchronized (listeners) { | ||
for (WeakReference<BTraceEngineImpl.StateListener> ref : listeners) { | ||
BTraceEngineImpl.StateListener l = ref.get(); | ||
if (l != null) l.onTaskStop(task); | ||
} | ||
} | ||
} | ||
} |