Java tutorial
/** * Copyright (C) 2013-2014 the original author or authors. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, * any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/> */ package org.excalibur.aqmp.handler; import java.util.List; import java.util.concurrent.ExecutorService; import java.util.concurrent.ThreadFactory; import java.util.concurrent.TimeUnit; import javax.annotation.Resource; import org.excalibur.core.cloud.api.VirtualMachine; import org.excalibur.core.cloud.api.domain.Instances; import org.excalibur.core.deployment.domain.Deployment; import org.excalibur.core.deployment.utils.DeploymentUtils; import org.excalibur.core.domain.repository.RegionRepository; import org.excalibur.core.domain.repository.UserRepository; import org.excalibur.core.services.InstanceService; import org.excalibur.core.task.TaskResult; import org.excalibur.core.task.TaskState; import org.excalibur.core.task.TaskType; import org.excalibur.core.util.AnyThrow; import org.excalibur.core.util.concurrent.DynamicExecutors; import org.excalibur.core.workflow.context.WorkflowContextImpl; import org.excalibur.core.workflow.domain.WorkflowDescription; import org.excalibur.core.workflow.flow.ActivityExecutionContext; import org.excalibur.core.workflow.flow.Workflow; import org.excalibur.core.workflow.flow.WorkflowBuilder; import org.excalibur.core.workflow.flow.WorkflowContext; import org.excalibur.core.workflow.flow.WorkflowExecutionStrategy; import org.excalibur.core.workflow.flow.WorkflowExecutor; import org.excalibur.core.workflow.repository.TaskRepository; import org.excalibur.core.workflow.repository.WorkflowRepository; import org.excalibur.service.deployment.service.DeploymentService; import org.excalibur.service.deployment.service.WorkflowService; import org.excalibur.service.manager.NodeManagerFactory; import org.slf4j.Logger; import org.springframework.amqp.rabbit.core.RabbitTemplate; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import com.google.common.eventbus.AsyncEventBus; import com.google.common.eventbus.EventBus; import com.google.common.util.concurrent.ThreadFactoryBuilder; import static com.google.common.base.Preconditions.*; @Component("deploymentHandler") public class DeploymentHandler { private static Logger LOG = org.slf4j.LoggerFactory.getLogger(DeploymentHandler.class.getName()); @Autowired private DeploymentService deploymentService; @Autowired private WorkflowService workflowService; @Autowired private WorkflowRepository workflowRepository_; @Autowired private TaskRepository taskRepository_; @Autowired private InstanceService instanceService_; @Autowired private RegionRepository regionRepository_; @Autowired private UserRepository userRepository_; @Resource(name = "newInstancesAmqpTemplate") private RabbitTemplate newInstanceTemplate_; @SuppressWarnings("unchecked") public void handle(Deployment deployment) { NodeManagerFactory.getManagerReference(); try { WorkflowDescription workflowDescription = deploymentService.createWorkflowFor(deployment); String thisHostname = System.getProperty("org.excalibur.instance.hostname"); VirtualMachine localNode = instanceService_.getInstanceByName(thisHostname); checkState(localNode != null); ThreadFactory threadFactory = new ThreadFactoryBuilder() .setNameFormat("event-bus-for-workflow-" + workflowDescription.getName() + "-%d").build(); int numberOfActivities = workflowDescription.getNumberOfActivities(); LOG.debug("workflow [{}] has [{}] activities [{}]", workflowDescription.getName(), numberOfActivities); ExecutorService eventBusExecutor = DynamicExecutors.newScalingThreadPool(1, numberOfActivities, 5, TimeUnit.MINUTES, threadFactory); EventBus bus = new AsyncEventBus(eventBusExecutor); final Workflow workflow = new WorkflowBuilder().description(workflowDescription).eventBus(bus).build(); final WorkflowExecutionStrategy strategy = new WorkflowExecutionStrategy(workflow); WorkflowContext context = new WorkflowContextImpl(workflow, workflowRepository_, strategy); context.setWorkflowCoordinator(localNode); context.registerExecutors(eventBusExecutor); final WorkflowExecutor executor = new WorkflowExecutor(context, taskRepository_, userRepository_, regionRepository_, localNode); List<ActivityExecutionContext> executionContexts = executor.execute(); for (ActivityExecutionContext executionContext : executionContexts) { for (TaskType<?> task : executionContext.getTasks()) { TaskResult<Instances> result = (TaskResult<Instances>) task.getResult(); if (result != null && TaskState.SUCCESS.equals(result.getTaskState())) { LOG.debug("Task [{}] executed successfully in [{}] ms", TimeUnit.MILLISECONDS.toMillis(result.getFinishTime() - result.getStartTime())); newInstanceTemplate_.convertAndSend(result.getResult()); } } } long elapsedTime = workflowDescription.getCreatedIn() != null ? System.currentTimeMillis() - workflowDescription.getCreatedIn().getTime() : 0; LOG.debug("Finished the workflow [{}] in [{}] seconds", workflowDescription.getName(), TimeUnit.MILLISECONDS.toSeconds(elapsedTime)); } catch (Exception exception) { String text = DeploymentUtils.marshalQuietly(deployment); LOG.error("Error on executing the deployment [{}]. Error message [{}]", text, exception.getMessage(), exception); AnyThrow.throwUncheked(exception); } } }