Split out NoOpDOMStoreThreePhaseCommitCohort

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/NoOpDOMStoreThreePhaseCommitCohort.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/NoOpDOMStoreThreePhaseCommitCohort.java
new file mode 100644 (file)
index 0000000..766cf1d
--- /dev/null
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/NoOpDOMStoreThreePhaseCommitCohort.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2015 Brocade Communications 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 com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
+
+/**
+ * A {@link DOMStoreThreePhaseCommitCohort} instance given out for empty transactions.
+ */
+final class NoOpDOMStoreThreePhaseCommitCohort implements DOMStoreThreePhaseCommitCohort {
+    static final NoOpDOMStoreThreePhaseCommitCohort INSTANCE = new NoOpDOMStoreThreePhaseCommitCohort();
+
+    private static final ListenableFuture<Void> IMMEDIATE_VOID_SUCCESS = Futures.immediateFuture(null);
+    private static final ListenableFuture<Boolean> IMMEDIATE_BOOLEAN_SUCCESS = Futures.immediateFuture(Boolean.TRUE);
+
+    private NoOpDOMStoreThreePhaseCommitCohort() {
+        // Hidden to prevent instantiation
+    }
+
+    @Override
+    public ListenableFuture<Boolean> canCommit() {
+        return IMMEDIATE_BOOLEAN_SUCCESS;
+    }
+
+    @Override
+    public ListenableFuture<Void> preCommit() {
+        return IMMEDIATE_VOID_SUCCESS;
+    }
+
+    @Override
+    public ListenableFuture<Void> abort() {
+        return IMMEDIATE_VOID_SUCCESS;
+    }
+
+    @Override
+    public ListenableFuture<Void> commit() {
+        return IMMEDIATE_VOID_SUCCESS;
+    }
+}
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