Decouple config and netconf subsystems.

[controller.git] / opendaylight / netconf / sal-netconf-connector / src / main / java / org / opendaylight / controller / sal / connect / netconf / listener / UncancellableFuture.java

diff --git a/opendaylight/netconf/sal-netconf-connector/src/main/java/org/opendaylight/controller/sal/connect/netconf/listener/UncancellableFuture.java b/opendaylight/netconf/sal-netconf-connector/src/main/java/org/opendaylight/controller/sal/connect/netconf/listener/UncancellableFuture.java
new file mode 100644 (file)
index 0000000..6219c4c
--- /dev/null
+++ b/opendaylight/netconf/sal-netconf-connector/src/main/java/org/opendaylight/controller/sal/connect/netconf/listener/UncancellableFuture.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2014 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.sal.connect.netconf.listener;
+
+import com.google.common.base.Preconditions;
+import com.google.common.util.concurrent.AbstractFuture;
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.GuardedBy;
+
+final class UncancellableFuture<V> extends AbstractFuture<V> {
+    @GuardedBy("this")
+    private boolean uncancellable = false;
+
+    public UncancellableFuture(final boolean uncancellable) {
+        this.uncancellable = uncancellable;
+    }
+
+    public synchronized boolean setUncancellable() {
+        if (isCancelled()) {
+            return false;
+        }
+
+        uncancellable = true;
+        return true;
+    }
+
+    public synchronized boolean isUncancellable() {
+        return uncancellable;
+    }
+
+    @Override
+    public synchronized boolean cancel(final boolean mayInterruptIfRunning) {
+        return uncancellable ? false : super.cancel(mayInterruptIfRunning);
+    }
+
+    @Override
+    public synchronized boolean set(@Nullable final V value) {
+        Preconditions.checkState(uncancellable);
+        return super.set(value);
+    }
+
+    @Override
+    protected boolean setException(final Throwable throwable) {
+        Preconditions.checkState(uncancellable);
+        return super.setException(throwable);
+    }
+}