RamManager.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;
- import java.io.InputStream;
- /**
- * <code>RamManager</code> manages a memory pool of a configured limit.
- */
- interface RamManager {
- /**
- * Reserve memory for data coming through the given input-stream.
- *
- * @param requestedSize size of memory requested
- * @param in input stream
- * @throws InterruptedException
- * @return <code>true</code> if memory was allocated immediately,
- * else <code>false</code>
- */
- boolean reserve(int requestedSize, InputStream in)
- throws InterruptedException;
-
- /**
- * Return memory to the pool.
- *
- * @param requestedSize size of memory returned to the pool
- */
- void unreserve(int requestedSize);
- }