| /** |
| * 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); |
| } |