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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2020 Nordix Foundation.
* Modifications Copyright (C) 2021 Bell Canada. 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.plugins.executor.java;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Properties;
import org.onap.policy.apex.context.ContextException;
import org.onap.policy.apex.core.engine.executor.TaskExecutor;
import org.onap.policy.apex.core.engine.executor.context.TaskExecutionContext;
import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* The Class JavaTaskExecutor is the task executor for task logic written in Java.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class JavaTaskExecutor extends TaskExecutor {
// Logger for this class
private static final XLogger LOGGER = XLoggerFactory.getXLogger(JavaTaskExecutor.class);
// The Java Task executor class
private Object taskLogicObject = null;
/**
* Prepares the task for processing.
*
* @throws StateMachineException thrown when a state machine execution error occurs
*/
@Override
public void prepare() throws StateMachineException {
// Call generic prepare logic
super.prepare();
// Get the class for task execution
try {
// Create the task logic object from the byte code of the class
taskLogicObject =
Class.forName(getSubject().getTaskLogic().getLogic()).getDeclaredConstructor().newInstance();
} catch (final Exception e) {
LOGGER.error("instantiation error on Java class \"" + getSubject().getTaskLogic().getLogic() + "\"", e);
throw new StateMachineException(
"instantiation error on Java class \"" + getSubject().getTaskLogic().getLogic() + "\"", e);
}
}
/**
* Executes the executor for the task in a sequential manner.
*
* @param executionId the execution ID for the current APEX policy execution
* @param executionProperties properties for the current APEX policy execution
* @param incomingFields the incoming fields
* @return The outgoing fields
* @throws StateMachineException on an execution error
* @throws ContextException on context errors
*/
@Override
public Map<String, Map<String, Object>> execute(final long executionId, final Properties executionProperties,
final Map<String, Object> incomingFields) throws StateMachineException, ContextException {
// Do execution pre work
executePre(executionId, executionProperties, incomingFields);
// Check and execute the Java logic
boolean returnValue = false;
try {
// Find and call the method with the signature "public boolean getEvent(final TaskExecutionContext executor)
// throws ApexException" to invoke the
// task logic in the Java class
final Method method =
taskLogicObject.getClass().getDeclaredMethod("getEvent", new Class[] {TaskExecutionContext.class});
returnValue = (boolean) method.invoke(taskLogicObject, getExecutionContext());
} catch (final Exception e) {
LOGGER.error("execute: task logic failed to run for task \"" + getSubject().getKey().getId() + "\"");
throw new StateMachineException(
"task logic failed to run for task \"" + getSubject().getKey().getId() + "\"", e);
}
// Do the execution post work
executePost(returnValue);
// Send back the return event
return getOutgoing();
}
/**
* Cleans up the task after processing.
*
* @throws StateMachineException thrown when a state machine execution error occurs
*/
@Override
public void cleanUp() throws StateMachineException {
LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + "," + getSubject().getTaskLogic().getLogicFlavour()
+ "," + getSubject().getTaskLogic().getLogic());
}
}
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