/**************************************************************************
* Copyright (c) 2009, 2013 by Chris Gray, /k/ Embedded Java Solutions. *
* All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of /k/ Embedded Java Solutions nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written *
* permission. *
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
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**************************************************************************/
package java.net;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.util.Iterator;
import java.util.HashMap;
import java.util.Map;
class SocketUsers {
private static HashMap psi2t = new HashMap();
private static int putcount;
static synchronized Thread put(Object psi, Thread t) {
WeakReference wr = (WeakReference)psi2t.put(psi, new WeakReference(t));
if (++putcount >= 100) {
putcount = 0;
// Clean up stale references
Iterator iter = psi2t.entrySet().iterator();
while (iter.hasNext()) {
WeakReference wr0 = (WeakReference)((Map.Entry)iter.next()).getValue();
if (wr0.get() == null) {
iter.remove();
}
}
}
return wr == null ? null : (Thread)wr.get();
}
static synchronized Thread remove(Object psi) {
WeakReference wr = (WeakReference)psi2t.remove(psi);
return wr == null ? null : (Thread)wr.get();
}
static synchronized void clear() {
psi2t.clear();
}
static synchronized Thread get(Object psi) {
WeakReference wr = (WeakReference)psi2t.get(psi);
if (wr == null) {
return null;
}
Thread t = (Thread)wr.get();
if (t == null) {
psi2t.remove(psi);
}
return t;
}
}