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package org.apache.tapestry.services.impl; |
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import edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantLock; |
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import org.apache.tapestry.event.ReportStatusEvent; |
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import org.apache.tapestry.event.ReportStatusListener; |
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import org.apache.tapestry.event.ResetEventListener; |
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import org.apache.tapestry.services.ObjectPool; |
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import java.util.*; |
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public class ObjectPoolImpl implements ObjectPool, ResetEventListener, ReportStatusListener |
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{ |
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private String _serviceId; |
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private int _count = 0; |
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private final ReentrantLock _lock = new ReentrantLock(); |
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private Map _pool = new HashMap(); |
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public Object get(Object key) |
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{ |
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List pooled = (List) _pool.get(key); |
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try |
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{ |
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_lock.lock(); |
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if (pooled == null || pooled.isEmpty()) |
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return null; |
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_count--; |
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return pooled.remove(0); |
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} finally |
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{ |
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_lock.unlock(); |
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} |
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} |
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public void store(Object key, Object value) |
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{ |
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List pooled = (List) _pool.get(key); |
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try |
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{ |
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_lock.lock(); |
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if (pooled == null) |
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{ |
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pooled = new LinkedList(); |
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_pool.put(key, pooled); |
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} |
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pooled.add(value); |
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_count++; |
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} finally |
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{ |
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_lock.unlock(); |
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} |
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} |
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public void resetEventDidOccur() |
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{ |
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_pool.clear(); |
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_count = 0; |
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} |
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public void reportStatus(ReportStatusEvent event) |
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{ |
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event.title(_serviceId); |
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event.property("total count", _count); |
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event.section("Count by Key"); |
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Iterator i = _pool.entrySet().iterator(); |
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while (i.hasNext()) |
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{ |
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Map.Entry entry = (Map.Entry) i.next(); |
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String key = entry.getKey().toString(); |
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List pooled = (List) entry.getValue(); |
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event.property(key, pooled.size()); |
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} |
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} |
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public void setServiceId(String serviceId) |
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{ |
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_serviceId = serviceId; |
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} |
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} |