/*
* Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.databridge.agent;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.databridge.agent.conf.AgentConfiguration;
import org.wso2.carbon.databridge.agent.conf.DataAgentsConfiguration;
import org.wso2.carbon.databridge.agent.exception.DataEndpointAgentConfigurationException;
import org.wso2.carbon.databridge.agent.exception.DataEndpointException;
import org.wso2.carbon.databridge.agent.util.DataEndpointConstants;
import org.wso2.carbon.utils.CarbonUtils;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
/**
* The holder for all Agents created and this is singleton class.
* The Agents will be loaded by reading a configuration file data-agent-config.xml default.
*/
public class AgentHolder {
private static Log log = LogFactory.getLog(AgentHolder.class);
private static String configPath;
private static AgentHolder instance;
private Map<String, DataEndpointAgent> dataEndpointAgents;
/**
* If there is no data publisher type is passed from,then the default Agent/Publisher will be used.
* The first element in the data-agent-config.xml is taken as default data publisher type.
*/
private String defaultDataEndpointAgentName;
private AgentHolder() throws DataEndpointAgentConfigurationException {
try {
dataEndpointAgents = new HashMap<String, DataEndpointAgent>();
DataAgentsConfiguration dataAgentsConfiguration = loadConfiguration();
boolean isDefault = true;
for (AgentConfiguration agentConfiguration : dataAgentsConfiguration.getAgentConfigurations()) {
addAgentConfiguration(agentConfiguration, isDefault);
if (isDefault) isDefault = false;
}
} catch (DataEndpointAgentConfigurationException e) {
log.error("Unable to complete initialization of agents." + e.getMessage(), e);
throw e;
}
}
public synchronized static AgentHolder getInstance() throws DataEndpointAgentConfigurationException {
if (instance == null) {
instance = new AgentHolder();
}
return instance;
}
public synchronized DataEndpointAgent getDataEndpointAgent(String type)
throws DataEndpointAgentConfigurationException {
DataEndpointAgent agent = this.dataEndpointAgents.get(type.toLowerCase());
if (agent == null) {
throw new DataEndpointAgentConfigurationException("No data agent configured for the type: " + type.toLowerCase());
}
return agent;
}
/**
* Loading by data-agent-config.xml via JAXB, and validating the configurations.
*
* @return Loaded DataAgentsConfiguration from config file.
* @throws DataEndpointAgentConfigurationException
*/
private DataAgentsConfiguration loadConfiguration()
throws DataEndpointAgentConfigurationException {
if (configPath == null) configPath = CarbonUtils.getCarbonConfigDirPath()
+ DataEndpointConstants.DATA_AGENT_CONF_FILE_PATH;
try {
File file = new File(configPath);
JAXBContext jaxbContext = JAXBContext.newInstance(DataAgentsConfiguration.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
DataAgentsConfiguration dataAgentsConfiguration = (DataAgentsConfiguration)
jaxbUnmarshaller.unmarshal(file);
dataAgentsConfiguration.validateConfigurations();
for (AgentConfiguration agentConfiguration : dataAgentsConfiguration.getAgentConfigurations()) {
if (agentConfiguration.getTrustStore() == null) {
agentConfiguration.setTrustStore(System.getProperty("javax.net.ssl.trustStore"));
if (agentConfiguration.getTrustStore() == null) {
throw new DataEndpointAgentConfigurationException("No trustStore found");
}
}
if (agentConfiguration.getTrustStorePassword() == null) {
agentConfiguration.setTrustStorePassword(System.getProperty("javax.net.ssl.trustStorePassword"));
if (agentConfiguration.getTrustStorePassword() == null) {
throw new DataEndpointAgentConfigurationException("No trustStore password found");
}
}
}
return dataAgentsConfiguration;
} catch (JAXBException e) {
throw new DataEndpointAgentConfigurationException("Error while loading the configuration file "
+ configPath, e);
}
}
private void addAgentConfiguration(AgentConfiguration agentConfiguration, boolean defaultAgent)
throws DataEndpointAgentConfigurationException {
DataEndpointAgent agent = new DataEndpointAgent(agentConfiguration);
dataEndpointAgents.put(agent.getAgentConfiguration().getDataEndpointName().toLowerCase(), agent);
if (defaultAgent) {
defaultDataEndpointAgentName = agent.getAgentConfiguration().getDataEndpointName();
}
}
/**
* Returns the default agent,and the first element in the data-agent-config.xml
* is taken as default data publisher type.
*
* @return DataEndpointAgent for the default endpoint name.
* @throws DataEndpointAgentConfigurationException
*/
public DataEndpointAgent getDefaultDataEndpointAgent() throws DataEndpointAgentConfigurationException {
return getDataEndpointAgent(defaultDataEndpointAgentName);
}
/**
* Set the data-agent-config.xml path from which the Agents for all endpoint types will be loaded.
* This is a one time operation, and if you are changing form default config path,
* then it needs to be done as first step when the JVM started.
*
* @param configPath The path of the data-bridge-conf.xml
*/
public static void setConfigPath(String configPath) {
AgentHolder.configPath = configPath;
}
public synchronized static void shutdown() throws DataEndpointException {
for (DataEndpointAgent dataEndpointAgent : instance.dataEndpointAgents.values()) {
dataEndpointAgent.shutDown();
}
instance = null;
}
}