/**
 * 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.command.wf;

import java.util.Properties;

import org.apache.oozie.ErrorCode;
import org.apache.oozie.WorkflowActionBean;
import org.apache.oozie.action.ActionExecutor;
import org.apache.oozie.command.CommandException;
import org.apache.oozie.command.PreconditionException;
import org.apache.oozie.executor.jpa.WorkflowActionGetJPAExecutor;
import org.apache.oozie.service.ActionService;
import org.apache.oozie.service.JPAService;
import org.apache.oozie.service.Services;
import org.apache.oozie.util.LogUtils;
import org.apache.oozie.util.ParamChecker;

/**
 * This command is executed once the Workflow command is finished.
 */
public class CompletedActionXCommand extends WorkflowXCommand<Void> {
    private final String actionId;
    private final String externalStatus;
    private JPAService jpaService;
    private WorkflowActionBean wfactionBean;

    public CompletedActionXCommand(String actionId, String externalStatus, Properties actionData, int priority) {
        super("callback", "callback", priority);
        this.actionId = ParamChecker.notEmpty(actionId, "actionId");
        this.externalStatus = ParamChecker.notEmpty(externalStatus, "externalStatus");
    }

    public CompletedActionXCommand(String actionId, String externalStatus, Properties actionData) {
        this(actionId, externalStatus, actionData, 1);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.oozie.command.XCommand#eagerLoadState()
     */
    @Override
    protected void eagerLoadState() throws CommandException {
        super.eagerLoadState();
        try {
            jpaService = Services.get().get(JPAService.class);
            if (jpaService != null) {
                this.wfactionBean = jpaService.execute(new WorkflowActionGetJPAExecutor(this.actionId));
            }
            else {
                throw new CommandException(ErrorCode.E0610);
            }
        }
        catch (Exception ex) {
            throw new CommandException(ErrorCode.E0603, ex);
        }
        LogUtils.setLogInfo(this.wfactionBean, logInfo);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.oozie.command.XCommand#eagerVerifyPrecondition()
     */
    @Override
    protected void eagerVerifyPrecondition() throws CommandException, PreconditionException {
        super.eagerVerifyPrecondition();
        if (this.wfactionBean.getStatus() != WorkflowActionBean.Status.RUNNING) {
            throw new CommandException(ErrorCode.E0800, actionId, this.wfactionBean.getStatus());
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.oozie.command.XCommand#execute()
     */
    @Override
    protected Void execute() throws CommandException {
        ActionExecutor executor = Services.get().get(ActionService.class).getExecutor(this.wfactionBean.getType());
        // this is done because oozie notifications (of sub-wfs) is send
        // every status change, not only on completion.
        if (executor.isCompleted(externalStatus)) {
            queue(new ActionCheckXCommand(this.wfactionBean.getId(), getPriority(), -1));
        }
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.oozie.command.XCommand#getEntityKey()
     */
    @Override
    protected String getEntityKey() {
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.oozie.command.XCommand#isLockRequired()
     */
    @Override
    protected boolean isLockRequired() {
        return false;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.oozie.command.XCommand#loadState()
     */
    @Override
    protected void loadState() throws CommandException {
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.oozie.command.XCommand#verifyPrecondition()
     */
    @Override
    protected void verifyPrecondition() throws CommandException, PreconditionException {
    }
}