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hadoop-dragon-core/src/main/java/org/apache/hadoop/realtime/child/Context.java
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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. | ||
| */ | ||
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| package org.apache.hadoop.realtime.child; | ||
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| import java.io.IOException; | ||
| import java.util.concurrent.TimeUnit; | ||
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| import org.apache.hadoop.classification.InterfaceAudience; | ||
| import org.apache.hadoop.classification.InterfaceStability; | ||
| import org.apache.hadoop.realtime.conf.DragonConfiguration; | ||
| import org.apache.hadoop.realtime.event.Event; | ||
| import org.apache.hadoop.realtime.mr.Mapper; | ||
| import org.apache.hadoop.realtime.mr.Reducer; | ||
| import org.apache.hadoop.realtime.records.TaskAttemptId; | ||
| import org.apache.hadoop.realtime.records.TaskType; | ||
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| /** | ||
| * A context object that allows input and output from the task. It is only | ||
| * supplied to the {@link Mapper} or {@link Reducer}. | ||
| * @param <KEYIN> the input key type for the task | ||
| * @param <VALUEIN> the input value type for the task | ||
| * @param <KEYOUT> the output key type for the task | ||
| * @param <VALUEOUT> the output value type for the task | ||
| */ | ||
| @InterfaceAudience.Public | ||
| @InterfaceStability.Evolving | ||
| public interface Context<KEYIN,VALUEIN,KEYOUT,VALUEOUT> { | ||
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| DragonConfiguration getConfiguration(); | ||
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| TaskAttemptId getTaskAttemptId(); | ||
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| /** | ||
| * return the partition number of this task | ||
| * @return | ||
| */ | ||
| int getPartition(); | ||
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| String getUser(); | ||
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| TaskType getTaskType(); | ||
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| /** | ||
| * take a event from the queue. | ||
| * | ||
| * @return the current key object or null if there isn't one | ||
| * @throws IOException | ||
| * @throws InterruptedException | ||
| */ | ||
| public Event<KEYIN, VALUEIN> pollEvent() throws IOException, | ||
| InterruptedException; | ||
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| /** | ||
| * take a event from event producer | ||
| * | ||
| * @return the current key object or null if there isn't one | ||
| * @throws IOException | ||
| * @throws InterruptedException | ||
| */ | ||
| public Event<KEYIN, VALUEIN> pollEvent(long timeout, TimeUnit unit) | ||
| throws IOException, InterruptedException; | ||
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| /** | ||
| * Generate an output event | ||
| */ | ||
| public boolean emitEvent(Event<KEYOUT, VALUEOUT> event) throws IOException, | ||
| InterruptedException; | ||
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| /** | ||
| * Generate an output event | ||
| */ | ||
| public boolean emitEvent(Event<KEYOUT, VALUEOUT> event, long timeout, | ||
| TimeUnit unit) throws IOException, InterruptedException; | ||
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| } |
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