1 files changed, 82 insertions, 0 deletions
diff --git a/framework/src/onos/core/net/src/main/java/org/onosproject/net/intent/impl/IntentAccumulator.java b/framework/src/onos/core/net/src/main/java/org/onosproject/net/intent/impl/IntentAccumulator.java
new file mode 100644
index 00000000..54276ad4
--- /dev/null
+++ b/framework/src/onos/core/net/src/main/java/org/onosproject/net/intent/impl/IntentAccumulator.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2015 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.onosproject.net.intent.impl;
+
+import com.google.common.collect.Maps;
+import org.onlab.util.AbstractAccumulator;
+import org.onosproject.net.intent.IntentBatchDelegate;
+import org.onosproject.net.intent.IntentData;
+import org.onosproject.net.intent.Key;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Timer;
+
+/**
+ * An accumulator for building batches of intent operations. Only one batch should
+ * be in process per instance at a time.
+ */
+public class IntentAccumulator extends AbstractAccumulator<IntentData> {
+
+    private static final int DEFAULT_MAX_EVENTS = 1000;
+    private static final int DEFAULT_MAX_IDLE_MS = 10;
+    private static final int DEFAULT_MAX_BATCH_MS = 50;
+
+    // FIXME: Replace with a system-wide timer instance;
+    // TODO: Convert to use HashedWheelTimer or produce a variant of that; then decide which we want to adopt
+    private static final Timer TIMER = new Timer("onos-intent-op-batching");
+
+    private final IntentBatchDelegate delegate;
+
+    private volatile boolean ready;
+
+    /**
+     * Creates an intent operation accumulator.
+     *
+     * @param delegate the intent batch delegate
+     */
+    protected IntentAccumulator(IntentBatchDelegate delegate) {
+        super(TIMER, DEFAULT_MAX_EVENTS, DEFAULT_MAX_BATCH_MS, DEFAULT_MAX_IDLE_MS);
+        this.delegate = delegate;
+        // Assume that the delegate is ready for work at the start
+        ready = true; //TODO validate the assumption that delegate is ready
+    }
+
+    @Override
+    public void processItems(List<IntentData> items) {
+        ready = false;
+        delegate.execute(reduce(items));
+    }
+
+    private Collection<IntentData> reduce(List<IntentData> ops) {
+        Map<Key, IntentData> map = Maps.newHashMap();
+        for (IntentData op : ops) {
+            map.put(op.key(), op);
+        }
+        //TODO check the version... or maybe store will handle this.
+        return map.values();
+    }
+
+    @Override
+    public boolean isReady() {
+        return ready;
+    }
+
+    public void ready() {
+        ready = true;
+    }
+}