com.liferay.portal.workflow.WorkflowLockingAdvice.java Source code

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Here is the source code for com.liferay.portal.workflow.WorkflowLockingAdvice.java

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/**
 * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.workflow;

import com.liferay.portal.kernel.util.StringPool;
import com.liferay.portal.kernel.util.StringUtil;
import com.liferay.portal.kernel.util.Time;
import com.liferay.portal.kernel.workflow.WorkflowDefinition;
import com.liferay.portal.kernel.workflow.WorkflowException;
import com.liferay.portal.service.LockLocalServiceUtil;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;

/**
 * @author Shuyang Zhou
 * @author Brian Wing Shun Chan
 */
public class WorkflowLockingAdvice {

    public Object invoke(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

        Signature signature = proceedingJoinPoint.getSignature();

        String methodName = signature.getName();

        Object[] arguments = proceedingJoinPoint.getArgs();

        if (methodName.equals(_START_WORKFLOW_INSTANCE_METHOD_NAME)) {
            String workflowDefinitionName = (String) arguments[3];
            Integer workflowDefinitionVersion = (Integer) arguments[4];

            String className = WorkflowDefinition.class.getName();
            String key = _encodeKey(workflowDefinitionName, workflowDefinitionVersion);

            if (LockLocalServiceUtil.isLocked(className, key)) {
                throw new WorkflowException("Workflow definition name " + workflowDefinitionName + " and version "
                        + workflowDefinitionVersion + " is being undeployed");
            }

            return proceedingJoinPoint.proceed();
        } else if (!methodName.equals(_UNDEPLOY_WORKFLOW_DEFINITION_METHOD_NAME)) {

            return proceedingJoinPoint.proceed();
        }

        long userId = (Long) arguments[1];
        String name = (String) arguments[2];
        Integer version = (Integer) arguments[3];

        String className = WorkflowDefinition.class.getName();
        String key = _encodeKey(name, version);

        if (LockLocalServiceUtil.isLocked(className, key)) {
            throw new WorkflowException(
                    "Workflow definition name " + name + " and version " + version + " is being undeployed");
        }

        try {
            LockLocalServiceUtil.lock(userId, className, key, String.valueOf(userId), false, Time.HOUR);

            return proceedingJoinPoint.proceed();
        } finally {
            LockLocalServiceUtil.unlock(className, key);
        }
    }

    private String _encodeKey(String name, int version) {
        return name.concat(StringPool.POUND).concat(StringUtil.toHexString(version));
    }

    private static final String _START_WORKFLOW_INSTANCE_METHOD_NAME = "startWorkflowInstance";

    private static final String _UNDEPLOY_WORKFLOW_DEFINITION_METHOD_NAME = "undeployWorkflowDefinition";

}