nz.co.senanque.messaging.ErrorEndpoint.java Source code

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Here is the source code for nz.co.senanque.messaging.ErrorEndpoint.java

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/*******************************************************************************
 * Copyright (c)2014 Prometheus Consulting
 *
 * 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.
 *******************************************************************************/
package nz.co.senanque.messaging;

import java.util.List;
import java.util.concurrent.locks.Lock;

import nz.co.senanque.locking.LockAction;
import nz.co.senanque.locking.LockFactory;
import nz.co.senanque.locking.LockTemplate;
import nz.co.senanque.workflow.BundleSelector;
import nz.co.senanque.workflow.ContextUtils;
import nz.co.senanque.workflow.WorkflowDAO;
import nz.co.senanque.workflow.WorkflowException;
import nz.co.senanque.workflow.WorkflowManager;
import nz.co.senanque.workflow.instances.ProcessInstance;
import nz.co.senanque.workflow.instances.TaskStatus;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.integration.IntegrationMessageHeaderAccessor;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.MessagingException;

/**
 * We land here if there is some kind of error so the goal here is to pull the error from the
 * message and tell the relevant process to abort. Of course the process may choose to trap and
 * handle the abort, so this is not final. But if it does that it is not our concern here.
 * 
 * @author Roger Parkinson
 * 
 */
public class ErrorEndpoint implements MessageMapper {

    private static final Logger log = LoggerFactory.getLogger(ErrorEndpoint.class);

    @Autowired
    private WorkflowManager m_workflowManager;
    @Autowired
    WorkflowDAO m_workflowDAO;
    @Autowired
    private LockFactory m_lockFactory;
    @Autowired
    private BundleSelector m_bundleSelector;

    public void processErrorMessage(final Message<MessagingException> message) {
        MessageHeaders messageHeaders = message.getHeaders();
        final MessagingException messagingException = (MessagingException) message.getPayload();
        Long correlationId = message.getHeaders().get(IntegrationMessageHeaderAccessor.CORRELATION_ID, Long.class);
        if (correlationId == null) {
            correlationId = messagingException.getFailedMessage().getHeaders()
                    .get(IntegrationMessageHeaderAccessor.CORRELATION_ID, Long.class);
        }
        log.debug("ProcessInstance: correlationId {}", correlationId);
        if (correlationId == null) {
            log.error("correlation Id is null");
            throw new WorkflowException("correlation Id is null");
        }
        final ProcessInstance processInstance = getWorkflowDAO().findProcessInstance(correlationId);
        if (processInstance == null) {
            throw new WorkflowException("Failed to find processInstance for " + correlationId);
        }
        getBundleSelector().selectBundle(processInstance);
        List<Lock> locks = ContextUtils.getLocks(processInstance, getLockFactory(),
                "nz.co.senanque.messaging.ErrorEndpoint.processErrorMessage");
        LockTemplate lockTemplate = new LockTemplate(locks, new LockAction() {

            public void doAction() {

                if (processInstance.getStatus() != TaskStatus.WAIT) {
                    throw new WorkflowException("Process is not in a wait state");
                }
                getWorkflowManager().processMessage(processInstance, message, getMessageMapper());
            }

        });
        if (!lockTemplate.doAction()) {
            throw new WorkflowRetryableException("Failed to get a lock"); // This will be retried 
        }
    }

    private MessageMapper getMessageMapper() {
        return this;
    }

    public void unpackMessage(Message<?> message, Object context) {
        // this is always an error so extract the error message and throw an exception.
        final MessagingException messagingException = (MessagingException) message.getPayload();
        throw new WorkflowException(messagingException.getCause().getMessage());
    }

    public LockFactory getLockFactory() {
        return m_lockFactory;
    }

    public void setLockFactory(LockFactory lockFactory) {
        m_lockFactory = lockFactory;
    }

    public WorkflowDAO getWorkflowDAO() {
        return m_workflowDAO;
    }

    public void setWorkflowDAO(WorkflowDAO workflowDAO) {
        m_workflowDAO = workflowDAO;
    }

    public WorkflowManager getWorkflowManager() {
        return m_workflowManager;
    }

    public void setWorkflowManager(WorkflowManager workflowManager) {
        m_workflowManager = workflowManager;
    }

    public BundleSelector getBundleSelector() {
        return m_bundleSelector;
    }

    public void setBundleSelector(BundleSelector bundleSelector) {
        m_bundleSelector = bundleSelector;
    }

}