CDS: Move DataChangeListener into a support class

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / DelayedListenerRegistration.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DelayedListenerRegistration.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DelayedListenerRegistration.java
new file mode 100644 (file)
index 0000000..8eb595d
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+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DelayedListenerRegistration.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2015 Cisco Systems, Inc. and others.  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
+ */
+package org.opendaylight.controller.cluster.datastore;
+
+import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+
+final class DelayedListenerRegistration implements
+    ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> {
+
+    private volatile boolean closed;
+
+    private final RegisterChangeListener registerChangeListener;
+
+    private volatile ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
+                                                         NormalizedNode<?, ?>>> delegate;
+
+    DelayedListenerRegistration(final RegisterChangeListener registerChangeListener) {
+        this.registerChangeListener = registerChangeListener;
+    }
+
+    void setDelegate( final ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
+                                        NormalizedNode<?, ?>>> registration) {
+        this.delegate = registration;
+    }
+
+    boolean isClosed() {
+        return closed;
+    }
+
+    RegisterChangeListener getRegisterChangeListener() {
+        return registerChangeListener;
+    }
+
+    @Override
+    public AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> getInstance() {
+        return delegate != null ? delegate.getInstance() : null;
+    }
+
+    @Override
+    public void close() {
+        closed = true;
+        if(delegate != null) {
+            delegate.close();
+        }
+    }
+}
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