JobStatusChangeEvent.java
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上传日期:2018-01-08
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- /**
- * 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.hadoop.mapred;
- /**
- * {@link JobStatusChangeEvent} tracks the change in job's status. Job's
- * status can change w.r.t
- * - run state i.e PREP, RUNNING, FAILED, KILLED, SUCCEEDED
- * - start time
- * - priority
- * Note that job times can change as the job can get restarted.
- */
- class JobStatusChangeEvent extends JobChangeEvent {
- // Events in job status that can lead to a job-status change
- static enum EventType {RUN_STATE_CHANGED, START_TIME_CHANGED, PRIORITY_CHANGED}
-
- private JobStatus oldStatus;
- private JobStatus newStatus;
- private EventType eventType;
-
- JobStatusChangeEvent(JobInProgress jip, EventType eventType,
- JobStatus oldStatus, JobStatus newStatus) {
- super(jip);
- this.oldStatus = oldStatus;
- this.newStatus = newStatus;
- this.eventType = eventType;
- }
-
- /**
- * Create a {@link JobStatusChangeEvent} indicating the state has changed.
- * Note that here we assume that the state change doesnt care about the old
- * state.
- */
- JobStatusChangeEvent(JobInProgress jip, EventType eventType, JobStatus status)
- {
- this(jip, eventType, status, status);
- }
-
- /**
- * Returns a event-type that caused the state change
- */
- EventType getEventType() {
- return eventType;
- }
-
- /**
- * Get the old job status
- */
- JobStatus getOldStatus() {
- return oldStatus;
- }
-
- /**
- * Get the new job status as a result of the events
- */
- JobStatus getNewStatus() {
- return newStatus;
- }
- }