[ONOS-7732] Automating switch workflow: api, app, and sample workflows
Change-Id: Iee87d4fe6cf61c1f8904d1d77df5f913a712b64a
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/HandlerTaskAccumulator.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/HandlerTaskAccumulator.java
new file mode 100644
index 0000000..4651cd4
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/HandlerTaskAccumulator.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.workflow.impl;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.ListMultimap;
+import org.onlab.util.AbstractAccumulator;
+import org.onosproject.workflow.api.HandlerTask;
+import org.onosproject.workflow.api.HandlerTaskBatchDelegate;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Timer;
+
+/**
+ * An accumulator for building batches of event task operations. Only one batch should
+ * be in process per instance at a time.
+ */
+public class HandlerTaskAccumulator extends AbstractAccumulator<HandlerTask> {
+
+ private static final int DEFAULT_MAX_EVENTS = 5000;
+ private static final int DEFAULT_MAX_IDLE_MS = 10;
+ private static final int DEFAULT_MAX_BATCH_MS = 50;
+
+ private static final Timer TIMER = new Timer("onos-workflow-handlertask-batching");
+
+ private final HandlerTaskBatchDelegate delegate;
+
+ private volatile boolean ready;
+
+ /**
+ * Creates an event-task operation accumulator.
+ *
+ * @param delegate the event-task batch delegate
+ */
+ protected HandlerTaskAccumulator(HandlerTaskBatchDelegate delegate) {
+ super(TIMER, DEFAULT_MAX_EVENTS, DEFAULT_MAX_BATCH_MS, DEFAULT_MAX_IDLE_MS);
+ this.delegate = delegate;
+ // Assume that the delegate is ready for workletType at the start
+ ready = true; //TODO validate the assumption that delegate is ready
+ }
+
+ @Override
+ public void processItems(List<HandlerTask> items) {
+ ready = false;
+ delegate.execute(epoch(items));
+ }
+
+ /**
+ * Gets epoch.
+ * @param ops handler tasks
+ * @return collection of collection of handler task.
+ */
+ private Collection<Collection<HandlerTask>> epoch(List<HandlerTask> ops) {
+
+ ListMultimap<String, HandlerTask> tasks = ArrayListMultimap.create();
+
+ // align event-tasks with context
+ for (HandlerTask op : ops) {
+ tasks.put(op.context().name(), op);
+ }
+
+ return tasks.asMap().values();
+ }
+
+ @Override
+ public boolean isReady() {
+ return ready;
+ }
+
+ /**
+ * Making accumulator to be ready.
+ */
+ public void ready() {
+ ready = true;
+ }
+}