Distributed work queue primitive
Change-Id: Ia8e531e6611ec502399edec376ccc00522e47994
diff --git a/core/api/src/main/java/org/onosproject/store/service/Task.java b/core/api/src/main/java/org/onosproject/store/service/Task.java
new file mode 100644
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+++ b/core/api/src/main/java/org/onosproject/store/service/Task.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2016-present 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.store.service;
+
+import java.util.function.Function;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * {@link WorkQueue} task.
+ *
+ * @param <E> task payload type.
+ */
+public class Task<E> {
+ private final E payload;
+ private final String taskId;
+
+ private Task() {
+ payload = null;
+ taskId = null;
+ }
+
+ /**
+ * Constructs a new task instance.
+ * @param taskId task identifier
+ * @param payload task payload
+ */
+ public Task(String taskId, E payload) {
+ this.taskId = taskId;
+ this.payload = payload;
+ }
+
+ /**
+ * Returns the task identifier.
+ * @return task id
+ */
+ public String taskId() {
+ return taskId;
+ }
+
+ /**
+ * Returns the task payload.
+ * @return task payload
+ */
+ public E payload() {
+ return payload;
+ }
+
+ /**
+ * Maps task from one payload type to another.
+ * @param mapper type mapper.
+ * @return mapped task.
+ */
+ public <F> Task<F> map(Function<E, F> mapper) {
+ return new Task<>(taskId, mapper.apply(payload));
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(getClass())
+ .add("taskId", taskId)
+ .add("payload", payload)
+ .toString();
+ }
+}