Java tutorial
/* * Copyright 2004,2005 The Apache Software Foundation. * * 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. */ package org.wso2.carbon.bam.service.data.publisher.internal; import org.apache.axiom.om.OMElement; import org.apache.axiom.om.impl.builder.StAXOMBuilder; import org.apache.axis2.AxisFault; import org.apache.axis2.context.ConfigurationContext; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.osgi.framework.BundleContext; import org.osgi.service.component.ComponentContext; import org.wso2.carbon.bam.service.data.publisher.conf.EventConfigNStreamDef; import org.wso2.carbon.bam.service.data.publisher.conf.EventPublisherConfig; import org.wso2.carbon.bam.service.data.publisher.conf.RegistryPersistenceManager; import org.wso2.carbon.bam.service.data.publisher.publish.ServiceAgentUtil; import org.wso2.carbon.bam.service.data.publisher.util.CommonConstants; import org.wso2.carbon.bam.service.data.publisher.util.ServiceStatisticsPublisherConstants; import org.wso2.carbon.bam.service.data.publisher.util.TenantEventConfigData; import org.wso2.carbon.base.ServerConfiguration; import org.wso2.carbon.registry.core.service.RegistryService; import org.wso2.carbon.statistics.services.SystemStatisticsUtil; import org.wso2.carbon.utils.Axis2ConfigurationContextObserver; import org.wso2.carbon.utils.CarbonUtils; import org.wso2.carbon.utils.ConfigurationContextService; import javax.xml.namespace.QName; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamException; import javax.xml.stream.XMLStreamReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.util.Map; /** * @scr.component name="org.wso2.carbon.bam.service.data.publisher " immediate="true" * @scr.reference name="org.wso2.carbon.statistics.services" * interface="org.wso2.carbon.statistics.services.SystemStatisticsUtil" * cardinality="1..1" policy="dynamic" bind="setSystemStatisticsUtil" * unbind="unsetSystemStatisticsUtil" * @scr.reference name="config.context.service" * interface="org.wso2.carbon.utils.ConfigurationContextService" cardinality="1..1" * policy="dynamic" bind="setConfigurationContextService" * unbind="unsetConfigurationContextService" * @scr.reference name="org.wso2.carbon.registry.service" * interface="org.wso2.carbon.registry.core.service.RegistryService" * cardinality="1..1" policy="dynamic" bind="setRegistryService" * unbind="unsetRegistryService" */ public class StatisticsServiceComponent { private static SystemStatisticsUtil systemStatisticsUtil; private static ConfigurationContext configurationContext; private static ServerConfiguration serverConfiguration; private static boolean publishingEnabled; private static Log log = LogFactory.getLog(StatisticsServiceComponent.class); protected void activate(ComponentContext context) { checkPublishingEnabled(); ServiceAgentUtil.setPublishingEnabled(publishingEnabled); //Engaging module only if service publishing is enabled in bam.xml if (publishingEnabled) { try { // Engaging StatisticsModule as a global module configurationContext.getAxisConfiguration().engageModule( ServiceStatisticsPublisherConstants.BAM_SERVICE_STATISTICS_PUBLISHER_MODULE_NAME); BundleContext bundleContext = context.getBundleContext(); bundleContext.registerService(Axis2ConfigurationContextObserver.class.getName(), new ServiceStatisticsAxis2ConfigurationContextObserver(), null); new RegistryPersistenceManager().load(); log.info("BAM service statistics data publisher bundle is activated"); } catch (AxisFault axisFault) { if (log.isErrorEnabled()) { log.error("Failed to activate BAM service statistics data publisher bundle", axisFault); } } catch (Throwable t) { log.error("Failed to activate BAM service statistics data publisher bundle", t); } } } protected void deactivate(ComponentContext context) { if (log.isDebugEnabled()) { log.debug("BAM service statistics data publisher bundle is deactivated"); Map<Integer, EventConfigNStreamDef> tenantSpecificEventConfig = TenantEventConfigData .getTenantSpecificEventingConfigData(); for (Map.Entry<Integer, EventConfigNStreamDef> entry : tenantSpecificEventConfig.entrySet()) { EventConfigNStreamDef configData = entry.getValue(); String key = configData.getUrl() + "_" + configData.getUserName() + "_" + configData.getPassword(); EventPublisherConfig eventPublisherConfig = ServiceAgentUtil.getEventPublisherConfig(key); if (null != eventPublisherConfig) { if (null != eventPublisherConfig.getDataPublisher()) eventPublisherConfig.getDataPublisher().stop(); if (null != eventPublisherConfig.getLoadBalancingDataPublisher()) eventPublisherConfig.getLoadBalancingDataPublisher().stop(); } } } } private void checkPublishingEnabled() { OMElement bamConfig = getPublishingConfig(); if (null != bamConfig) { OMElement servicePublishElement = bamConfig .getFirstChildWithName(new QName(CommonConstants.BAM_SERVICE_PUBLISH_OMELEMENT)); if (null != servicePublishElement) { if (servicePublishElement.getText().trim() .equalsIgnoreCase(CommonConstants.BAM_SERVICE_PUBLISH_ENABLED)) { publishingEnabled = true; } else { log.info("BAM Service Stat Publishing is disabled"); publishingEnabled = false; } } else { publishingEnabled = false; } } else { log.warn("Invalid " + CommonConstants.BAM_CONFIG_XML + ". Disabling service publishing."); publishingEnabled = false; } } private OMElement getPublishingConfig() { String bamConfigPath = CarbonUtils.getEtcCarbonConfigDirPath() + File.separator + CommonConstants.BAM_CONFIG_XML; File bamConfigFile = new File(bamConfigPath); try { XMLInputFactory xif = XMLInputFactory.newInstance(); InputStream inputStream = new FileInputStream(bamConfigFile); XMLStreamReader reader = xif.createXMLStreamReader(inputStream); xif.setProperty("javax.xml.stream.isCoalescing", false); StAXOMBuilder builder = new StAXOMBuilder(reader); return builder.getDocument().getOMDocumentElement(); } catch (FileNotFoundException e) { log.warn("No " + CommonConstants.BAM_CONFIG_XML + " found in " + bamConfigPath); return null; } catch (XMLStreamException e) { log.error("Incorrect format " + CommonConstants.BAM_CONFIG_XML + " file", e); return null; } } protected void setSystemStatisticsUtil(SystemStatisticsUtil systemStatisticsUtil) { this.systemStatisticsUtil = systemStatisticsUtil; } public static SystemStatisticsUtil getSystemStatisticsUtil() { return systemStatisticsUtil; } protected void unsetSystemStatisticsUtil(SystemStatisticsUtil sysStatUtil) { systemStatisticsUtil = null; } protected void setConfigurationContextService(ConfigurationContextService configurationContextService) { configurationContext = configurationContextService.getServerConfigContext(); } protected void unsetConfigurationContextService(ConfigurationContextService configurationContextService) { configurationContext = null; } protected void setRegistryService(RegistryService registryService) { try { RegistryPersistenceManager.setRegistryService(registryService); } catch (Exception e) { log.error("Cannot retrieve System Registry", e); } } protected void unsetRegistryService(RegistryService registryService) { RegistryPersistenceManager.setRegistryService(null); } public static boolean isPublishingEnabled() { return publishingEnabled; } }