/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
* 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. See accompanying LICENSE file.
*/
package org.apache.oozie.service;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.oozie.action.ActionExecutor;
import org.apache.oozie.service.Service;
import org.apache.oozie.service.ServiceException;
import org.apache.oozie.service.Services;
import org.apache.oozie.util.ParamChecker;
import org.apache.oozie.util.XLog;
import org.apache.oozie.ErrorCode;
import java.util.HashMap;
import java.util.Map;
public class ActionService implements Service {
public static final String CONF_ACTION_EXECUTOR_CLASSES = CONF_PREFIX + "ActionService.executor.classes";
public static final String CONF_ACTION_EXECUTOR_EXT_CLASSES = CONF_PREFIX + "ActionService.executor.ext.classes";
private Services services;
private Map<String, Class<? extends ActionExecutor>> executors;
@SuppressWarnings("unchecked")
public void init(Services services) throws ServiceException {
this.services = services;
ActionExecutor.enableInit();
ActionExecutor.resetInitInfo();
ActionExecutor.disableInit();
executors = new HashMap<String, Class<? extends ActionExecutor>>();
Class<? extends ActionExecutor>[] classes =
(Class<? extends ActionExecutor>[]) services.getConf().getClasses(CONF_ACTION_EXECUTOR_CLASSES);
registerExecutors(classes);
classes = (Class<? extends ActionExecutor>[]) services.getConf().getClasses(CONF_ACTION_EXECUTOR_EXT_CLASSES);
registerExecutors(classes);
}
private void registerExecutors(Class<? extends ActionExecutor>[] classes) throws ServiceException {
if (classes != null) {
for (Class<? extends ActionExecutor> executorClass : classes) {
register(executorClass);
}
}
}
public void destroy() {
ActionExecutor.enableInit();
ActionExecutor.resetInitInfo();
ActionExecutor.disableInit();
executors = null;
}
public Class<? extends Service> getInterface() {
return ActionService.class;
}
public void register(Class<? extends ActionExecutor> klass) throws ServiceException {
XLog log = XLog.getLog(getClass());
ActionExecutor executor = (ActionExecutor) ReflectionUtils.newInstance(klass, services.getConf());
if (executors.containsKey(executor.getType())) {
throw new ServiceException(ErrorCode.E0150, XLog.format(
"Action executor for action type [{1}] already registered", executor.getType()));
}
ActionExecutor.enableInit();
executor.initActionType();
ActionExecutor.disableInit();
executors.put(executor.getType(), klass);
log.trace("Registered Action executor for action type [{0}] class [{1}]", executor.getType(), klass);
}
public ActionExecutor getExecutor(String actionType) {
ParamChecker.notEmpty(actionType, "actionType");
Class<? extends ActionExecutor> executorClass = executors.get(actionType);
return (executorClass != null) ? (ActionExecutor) ReflectionUtils.newInstance(executorClass, null) : null;
}
}