Java tutorial
/* * #%L * BroadleafCommerce Workflow * %% * Copyright (C) 2009 - 2013 Broadleaf Commerce * %% * Licensed 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. * #L% */ package com.wakacommerce.common.cache; import org.apache.commons.lang3.ArrayUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.beans.factory.annotation.Value; import org.springframework.jmx.export.naming.SelfNaming; import org.springframework.jmx.support.ObjectNameManager; import org.springframework.stereotype.Service; import com.wakacommerce.common.time.SystemTime; import java.math.BigDecimal; import java.util.Collections; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.SortedSet; import java.util.TreeSet; import javax.management.Attribute; import javax.management.AttributeList; import javax.management.AttributeNotFoundException; import javax.management.DynamicMBean; import javax.management.InvalidAttributeValueException; import javax.management.MBeanAttributeInfo; import javax.management.MBeanException; import javax.management.MBeanInfo; import javax.management.MBeanOperationInfo; import javax.management.MalformedObjectNameException; import javax.management.ObjectName; import javax.management.ReflectionException; /** * */ @Service("blStatisticsService") public class StatisticsServiceImpl implements DynamicMBean, StatisticsService, SelfNaming { private static final Log LOG = LogFactory.getLog(StatisticsServiceImpl.class); @Value("${cache.stat.log.resolution}") protected Long logResolution = 30000L; protected String appName = "broadleaf"; protected StatisticsServiceLogAdapter adapter; protected Map<String, CacheStat> cacheStats = Collections.synchronizedMap(new HashMap<String, CacheStat>()); @Override public void addCacheStat(String key, boolean isHit) { CacheStat myStat = getCacheStat(key); if (isHit) { myStat.incrementHit(); } myStat.incrementRequest(); if (myStat.getLastLogTime() + logResolution < SystemTime.asMillis()) { myStat.setLastLogTime(SystemTime.asMillis()); BigDecimal percentage = myStat.getHitRate(); if (LOG.isInfoEnabled()) { LOG.info("Cache hit percentage for " + key + " is: " + percentage.toString() + "%"); } } } protected CacheStat getCacheStat(String key) { if (!cacheStats.containsKey(key)) { CacheStat stat = new CacheStat(); cacheStats.put(key, stat); } return cacheStats.get(key); } @Override public Long getLogResolution() { return logResolution; } @Override public void setLogResolution(Long logResolution) { this.logResolution = logResolution; } @Override public void activateLogging() { if (getAdapter() != null) { getAdapter().activateLogging(StatisticsServiceImpl.class); } } @Override public void disableLogging() { if (getAdapter() != null) { getAdapter().disableLogging(StatisticsServiceImpl.class); } } public String getAppName() { return appName; } public void setAppName(String appName) { this.appName = appName; } @Override public Object getAttribute(String attribute) throws AttributeNotFoundException, MBeanException, ReflectionException { if (attribute.equals("LOG_RESOLUTION")) { return getLogResolution(); } return getCacheStat(attribute).getHitRate().doubleValue(); } @Override public void setAttribute(Attribute attribute) throws AttributeNotFoundException, InvalidAttributeValueException, MBeanException, ReflectionException { if (attribute.getName().equals("LOG_RESOLUTION")) { setLogResolution((Long) attribute.getValue()); } //do nothing - not allowed } @Override public AttributeList getAttributes(String[] attributes) { AttributeList list = new AttributeList(); for (Map.Entry<String, CacheStat> stats : cacheStats.entrySet()) { list.add(new Attribute(stats.getKey(), stats.getValue().getHitRate().doubleValue())); } return list; } @Override public AttributeList setAttributes(AttributeList attributes) { for (Object attr : attributes) { try { setAttribute((Attribute) attr); } catch (Exception e) { LOG.error("cannot set attribute: " + ((Attribute) attr).getName(), e); } } return attributes; } @Override public Object invoke(String actionName, Object[] params, String[] signature) throws MBeanException, ReflectionException { if (actionName.equals("activate")) { activateLogging(); return null; } else if (actionName.equals("disable")) { disableLogging(); return null; } throw new MBeanException(new RuntimeException("Not Supported")); } @Override public ObjectName getObjectName() throws MalformedObjectNameException { return ObjectNameManager.getInstance("com.wakacommerce:name=StatisticsService." + appName); } @Override public MBeanInfo getMBeanInfo() { SortedSet<String> names = new TreeSet<String>(); for (Map.Entry<String, CacheStat> stats : cacheStats.entrySet()) { names.add(stats.getKey()); } MBeanAttributeInfo[] attrs = new MBeanAttributeInfo[names.size()]; Iterator<String> it = names.iterator(); for (int i = 0; i < attrs.length; i++) { String name = it.next(); attrs[i] = new MBeanAttributeInfo(name, "java.lang.Double", name, true, // isReadable false, // isWritable false); // isIs } attrs = ArrayUtils.add(attrs, new MBeanAttributeInfo("LOG_RESOLUTION", "java.lang.Double", "LOG_RESOLUTION", true, // isReadable true, // isWritable false) // isIs ); MBeanOperationInfo[] opers = { new MBeanOperationInfo("activate", "Activate statistic logging", null, // no parameters "void", MBeanOperationInfo.ACTION), new MBeanOperationInfo("disable", "Disable statistic logging", null, // no parameters "void", MBeanOperationInfo.ACTION) }; return new MBeanInfo("com.wakacommerce:name=StatisticsService." + appName, "Runtime Statistics", attrs, null, // constructors opers, null); // notifications } public StatisticsServiceLogAdapter getAdapter() { return adapter; } public void setAdapter(StatisticsServiceLogAdapter adapter) { this.adapter = adapter; } }