org.camunda.bpm.engine.rest.util.EngineUtil Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; 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.camunda.bpm.engine.rest.util;
import org.camunda.bpm.engine.ProcessEngine;
import org.camunda.bpm.engine.rest.exception.RestException;
import org.camunda.bpm.engine.rest.spi.ProcessEngineProvider;
import javax.ws.rs.core.Response.Status;
import java.util.Iterator;
import java.util.ServiceLoader;
public class EngineUtil {
/**
* Look up the process engine from the {@link ProcessEngineProvider}. If engineName is null, the default engine is returned.
* @param engineName
* @return
*/
public static ProcessEngine lookupProcessEngine(String engineName) {
ServiceLoader serviceLoader = ServiceLoader.load(ProcessEngineProvider.class);
Iterator iterator = serviceLoader.iterator();
if(iterator.hasNext()) {
ProcessEngineProvider provider = iterator.next();
if (engineName == null) {
return provider.getDefaultProcessEngine();
} else {
return provider.getProcessEngine(engineName);
}
} else {
throw new RestException(Status.INTERNAL_SERVER_ERROR, "Could not find an implementation of the "+ProcessEngineProvider.class+"- SPI");
}
}
}