| /* |
| * * |
| * * Licensed to the Apache Software Foundation (ASF) under one |
| * * or more contributor license agreements. See the NOTICE file |
| * * distributed with this work for additional information |
| * * regarding copyright ownership. The ASF licenses this file |
| * * to you 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.apache.tez.runtime.api.events; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Objects; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.tez.runtime.api.InputInitializer; |
| import org.apache.tez.runtime.api.Event; |
| |
| /** |
| * An event that is routed to the specified {@link InputInitializer}. |
| * This can be used to send information/metadata to the {@link InputInitializer} |
| * <p/> |
| * |
| * These events are routed to the InputInitializer, only after the task which generated the event |
| * succeeds. Also, the events will only be sent once per task - irrespective of how many attempts |
| * were run, or succeeded. An example of this is when a task is retried because the node on which it |
| * was running failed. If the Task had succeeded once, the event would already have been sent - and |
| * will not be resent when the task reruns and succeeds. </p> |
| */ |
| @Unstable |
| @Public |
| public class InputInitializerEvent extends Event { |
| |
| private String targetVertexName; |
| private String targetInputName; |
| |
| private ByteBuffer eventPayload; |
| private String sourceVertexName; |
| |
| private InputInitializerEvent(String targetVertexName, String targetInputName, |
| ByteBuffer eventPayload) { |
| Objects.requireNonNull(targetVertexName, "TargetVertexName cannot be null"); |
| Objects.requireNonNull(targetInputName, "TargetInputName cannot be null"); |
| this.targetVertexName = targetVertexName; |
| this.targetInputName = targetInputName; |
| this.eventPayload = eventPayload; |
| } |
| |
| /** |
| * @param targetVertexName the vertex on which the targeted Input exists |
| * @param targetInputName the name of the input |
| * @param eventPayload the payload for the event. It is advisable to limit the size of the |
| * payload to a few KB at max |
| */ |
| public static InputInitializerEvent create(String targetVertexName, String targetInputName, |
| ByteBuffer eventPayload) { |
| return new InputInitializerEvent(targetVertexName, targetInputName, eventPayload); |
| } |
| |
| /** |
| * Get the vertex name on which the targeted Input exists |
| * |
| * @return the vertex name |
| */ |
| public String getTargetVertexName() { |
| return this.targetVertexName; |
| } |
| |
| /** |
| * Get the input name to which this event is targeted |
| * |
| * @return the input name |
| */ |
| public String getTargetInputName() { |
| return this.targetInputName; |
| } |
| |
| /** |
| * Get the actual user payload |
| * |
| * @return a byte representation of the payload |
| */ |
| public ByteBuffer getUserPayload() { |
| return eventPayload == null ? null : eventPayload.asReadOnlyBuffer(); |
| } |
| |
| @InterfaceAudience.Private |
| public void setSourceVertexName(String srcVertexName) { |
| this.sourceVertexName = srcVertexName; |
| } |
| |
| /** |
| * Returns the name of the vertex which generated the event. This will only be populated after |
| * the event has been routed by the AM. |
| * @return the name of the source vertex |
| */ |
| public String getSourceVertexName() { |
| return this.sourceVertexName; |
| } |
| |
| @Override |
| public String toString() { |
| return "[TargetVertexName=" + targetVertexName + ", TargetInputName=" + targetInputName + |
| ", SourceVertexName=" + sourceVertexName + " Payload=" + eventPayload + "]"; |
| } |
| } |