MemoryCalculatorPlugin.java
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上传日期:2018-01-08
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文件大小:2k
- /**
- * 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.util;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.conf.Configured;
- /**
- * Plugin to calculate virtual and physical memories on the system.
- *
- */
- public abstract class MemoryCalculatorPlugin extends Configured {
- /**
- * Obtain the total size of the virtual memory present in the system.
- *
- * @return virtual memory size in bytes.
- */
- public abstract long getVirtualMemorySize();
- /**
- * Obtain the total size of the physical memory present in the system.
- *
- * @return physical memory size bytes.
- */
- public abstract long getPhysicalMemorySize();
- /**
- * Get the MemoryCalculatorPlugin from the class name and configure it. If
- * class name is null, this method will try and return a memory calculator
- * plugin available for this system.
- *
- * @param clazz class-name
- * @param conf configure the plugin with this.
- * @return MemoryCalculatorPlugin
- */
- public static MemoryCalculatorPlugin getMemoryCalculatorPlugin(
- Class<? extends MemoryCalculatorPlugin> clazz, Configuration conf) {
- if (clazz != null) {
- return ReflectionUtils.newInstance(clazz, conf);
- }
- // No class given, try a os specific class
- try {
- String osName = System.getProperty("os.name");
- if (osName.startsWith("Linux")) {
- return new LinuxMemoryCalculatorPlugin();
- }
- } catch (SecurityException se) {
- // Failed to get Operating System name.
- return null;
- }
- // Not supported on this system.
- return null;
- }
- }