hadoop RecordFactory 源码
haddop RecordFactory 代码
文件路径：/hadoop-tools/hadoop-gridmix/src/main/java/org/apache/hadoop/mapred/gridmix/RecordFactory.java
/**
* 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.gridmix;
import java.io.Closeable;
import java.io.IOException;
/**
* Interface for producing records as inputs and outputs to tasks.
*/
abstract class RecordFactory implements Closeable {
/**
* Transform the given record or perform some operation.
* @return true if the record should be emitted.
*/
public abstract boolean next(GridmixKey key, GridmixRecord val)
throws IOException;
/**
* Estimate of exhausted record capacity.
*/
public abstract float getProgress() throws IOException;
}
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