Adding DistributedIntentBatchQueue

Change-Id: I4ce3c2cb5a31ad8ace5d1d20830a49a869e63900

+/*
+ * Copyright 2014 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onlab.onos.store.intent.impl;
+
+import com.google.common.collect.ImmutableSet;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.onos.net.intent.IntentBatchDelegate;
+import org.onlab.onos.net.intent.IntentBatchService;
+import org.onlab.onos.net.intent.IntentOperations;
+import org.slf4j.Logger;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+import static org.slf4j.LoggerFactory.getLogger;
+
+@Component(immediate = true)
+@Service
+public class DistributedIntentBatchQueue implements IntentBatchService {
+
+    private final Logger log = getLogger(getClass());
+    private final Set<IntentOperations> pendingBatches = new HashSet<>();
+    private IntentBatchDelegate delegate;
+
+    @Activate
+    public void activate() {
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("Stopped");
+    }
+
+    @Override
+    public void addIntentOperations(IntentOperations operations) {
+        checkState(delegate != null, "No delegate set");
+        pendingBatches.add(operations);
+        delegate.execute(operations);
+    }
+
+    @Override
+    public void removeIntentOperations(IntentOperations operations) {
+        pendingBatches.remove(operations);
+    }
+
+    @Override
+    public Set<IntentOperations> getIntentOperations() {
+        return ImmutableSet.copyOf(pendingBatches);
+    }
+
+    @Override
+    public void setDelegate(IntentBatchDelegate delegate) {
+        this.delegate = checkNotNull(delegate, "Delegate cannot be null");
+    }
+
+    @Override
+    public void unsetDelegate(IntentBatchDelegate delegate) {
+        if (this.delegate != null && this.delegate.equals(delegate)) {
+            this.delegate = null;
+        }
+    }
+}