1 files changed, 103 insertions, 0 deletions
diff --git a/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/util/concurrent/SynchronizingCorrelator.java b/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/util/concurrent/SynchronizingCorrelator.java
new file mode 100644
index 0000000000..e7c2557394
--- /dev/null
+++ b/plugins/org.eclipse.net4j.util/src/org/eclipse/net4j/util/concurrent/SynchronizingCorrelator.java
@@ -0,0 +1,103 @@
+/***************************************************************************
+ * Copyright (c) 2004 - 2008 Eike Stepper, Germany.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *    Eike Stepper - initial API and implementation
+ **************************************************************************/
+package org.eclipse.net4j.util.concurrent;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+/**
+ * @author Eike Stepper
+ */
+public class SynchronizingCorrelator<CORRELATION, RESULT> implements ICorrelator<CORRELATION, ISynchronizer<RESULT>>
+{
+  private ConcurrentMap<CORRELATION, ISynchronizer<RESULT>> map = new ConcurrentHashMap<CORRELATION, ISynchronizer<RESULT>>(
+      0);
+
+  public boolean isCorrelated(CORRELATION correlation)
+  {
+    return map.containsKey(correlation);
+  }
+
+  public ISynchronizer<RESULT> correlate(CORRELATION correlation)
+  {
+    ISynchronizer<RESULT> synchronizer = map.get(correlation);
+    if (synchronizer == null)
+    {
+      synchronizer = createSynchronizer(correlation);
+      map.put(correlation, synchronizer);
+    }
+
+    return synchronizer;
+  }
+
+  public ISynchronizer<RESULT> correlateUnique(CORRELATION correlation)
+  {
+    ISynchronizer<RESULT> synchronizer = createSynchronizer(correlation);
+    if (map.putIfAbsent(correlation, synchronizer) != null)
+    {
+      throw new IllegalStateException("Already correlated: " + correlation); //$NON-NLS-1$
+    }
+
+    return synchronizer;
+  }
+
+  public ISynchronizer<RESULT> uncorrelate(CORRELATION correlation)
+  {
+    return map.remove(correlation);
+  }
+
+  public RESULT get(CORRELATION correlation, long timeout)
+  {
+    return correlate(correlation).get(timeout);
+  }
+
+  public void put(CORRELATION correlation, RESULT result)
+  {
+    correlate(correlation).put(result);
+  }
+
+  public boolean put(CORRELATION correlation, RESULT result, long timeout)
+  {
+    return correlate(correlation).put(result, timeout);
+  }
+
+  protected ISynchronizer<RESULT> createSynchronizer(final CORRELATION correlation)
+  {
+    // TODO Make top level class
+    return new ISynchronizer<RESULT>()
+    {
+      private ISynchronizer<RESULT> delegate = new ResultSynchronizer<RESULT>();
+
+      public RESULT get(long timeout)
+      {
+        RESULT result = delegate.get(timeout);
+        uncorrelate(correlation);
+        return result;
+      }
+
+      public void put(RESULT result)
+      {
+        delegate.put(result);
+      }
+
+      public boolean put(RESULT result, long timeout)
+      {
+        return delegate.put(result, timeout);
+      }
+    };
+  }
+
+  @Override
+  public String toString()
+  {
+    return "SynchronizingCorrelator" + map;
+  }
+}