dubbo MemoryStatusChecker 源码
dubbo MemoryStatusChecker 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/status/support/MemoryStatusChecker.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.dubbo.common.status.support;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.common.status.Status;
import org.apache.dubbo.common.status.StatusChecker;
/**
* MemoryStatus
*/
@Activate
public class MemoryStatusChecker implements StatusChecker {
@Override
public Status check() {
Runtime runtime = Runtime.getRuntime();
long freeMemory = runtime.freeMemory();
long totalMemory = runtime.totalMemory();
long maxMemory = runtime.maxMemory();
boolean ok = (maxMemory - (totalMemory - freeMemory) > 2*1024*1024); // Alarm when spare memory < 2M
String msg = "max:" + (maxMemory / 1024 / 1024) + "M,total:"
+ (totalMemory / 1024 / 1024) + "M,used:" + ((totalMemory / 1024 / 1024) - (freeMemory / 1024 / 1024)) + "M,free:" + (freeMemory / 1024 / 1024) + "M";
return new Status(ok ? Status.Level.OK : Status.Level.WARN, msg);
}
}
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