Java tutorial
/* * RHQ Management Platform * Copyright (C) 2005-2008 Red Hat, Inc. * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2, as * published by the Free Software Foundation, and/or the GNU Lesser * General Public License, version 2.1, also as published by the Free * Software Foundation. * * 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 and the GNU Lesser General Public License * for more details. * * You should have received a copy of the GNU General Public License * and the GNU Lesser General Public License along with this program; * if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package org.rhq.core.pc.inventory; import org.rhq.core.clientapi.agent.inventory.CreateResourceResponse; import org.rhq.core.clientapi.server.inventory.ResourceFactoryServerService; import org.rhq.core.domain.configuration.Configuration; import org.rhq.core.domain.resource.CreateResourceStatus; import org.rhq.core.pc.PluginContainer; import org.rhq.core.pluginapi.inventory.CreateChildResourceFacet; import org.rhq.core.pluginapi.inventory.CreateResourceReport; import org.rhq.core.util.exception.ThrowableUtil; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.util.concurrent.Callable; /** * Runnable implementation to thread create request requests. * * @author Jason Dobies */ public class CreateResourceRunner implements Callable, Runnable { // Attributes -------------------------------------------- private final Log log = LogFactory.getLog(CreateResourceRunner.class); /** * Handle to the manager that will do most of the logic. */ private ResourceFactoryManager resourceFactoryManager; /** * Parent resource on which the child will be created. */ private int parentResourceId; /** * Indicates whether or not to execute a runtime scan after the create. */ private boolean runRuntimeScan; /** * ID of the request being processed. This ID will be used when the response is sent back to the caller. */ private int requestId; /** * Facet to use to make the call against the plugin. */ private CreateChildResourceFacet facet; /** * Report to send to the facet as part of the call. */ private CreateResourceReport report; // Constructors -------------------------------------------- public CreateResourceRunner(ResourceFactoryManager resourceFactoryManager, int parentResourceId, CreateChildResourceFacet facet, int requestId, CreateResourceReport report, boolean runRuntimeScan) { this.resourceFactoryManager = resourceFactoryManager; this.parentResourceId = parentResourceId; this.facet = facet; this.requestId = requestId; this.report = report; this.runRuntimeScan = runRuntimeScan; } // Runnable Implementation -------------------------------------------- public void run() { try { call(); } catch (Exception e) { log.error("Error while chaining run to call", e); } } // Callable Implementation -------------------------------------------- public Object call() throws Exception { log.info("Creating resource through report: " + report); String resourceName = null; String resourceKey = null; String errorMessage; CreateResourceStatus status; Configuration configuration = null; try { // Make the create call to the plugin report = facet.createResource(report); // Pull out the plugin populated parts of the report and add to the request resourceName = report.getResourceName(); resourceKey = report.getResourceKey(); errorMessage = report.getErrorMessage(); status = report.getStatus(); configuration = report.getResourceConfiguration(); // Validate the status returned from the plugin CreateResourceStatus reportedStatus = report.getStatus(); if ((reportedStatus == null) || (reportedStatus == CreateResourceStatus.IN_PROGRESS)) { log.warn("Plugin did not indicate the result of the request: " + requestId); errorMessage = "Plugin did not indicate the result of the resource creation attempt."; status = CreateResourceStatus.FAILURE; } // Ensure a resource key was returned from the plugin if the plugin reports the create was successful if ((isSuccessStatus(reportedStatus)) && (resourceKey == null)) { log.warn("Plugin did not indicate the resource key for this request: " + requestId); errorMessage = "Plugin did not indicate a resource key for this request."; status = CreateResourceStatus.FAILURE; } // RHQ-666 - The plugin should provide a resource name if the create was successful if ((isSuccessStatus(reportedStatus)) && (resourceName == null)) { log.warn("Plugin did not indicate a resource name for the request: " + requestId); errorMessage = "Plugin did not indicate a resource name for this request."; status = CreateResourceStatus.FAILURE; } Throwable throwable = report.getException(); if (throwable != null) { if (log.isDebugEnabled()) log.debug("Throwable was found in creation report for request [" + requestId + "].", throwable); else log.warn("Throwable was found in creation report for request [" + requestId + "]: " + throwable + " - Enable DEBUG logging to see the stack trace."); status = CreateResourceStatus.FAILURE; String messages = ThrowableUtil.getAllMessages(throwable); // If we still don't have an error message, populate it from the exception errorMessage = (errorMessage != null) ? (errorMessage + " - Cause: " + messages) : messages; } } catch (Throwable t) { errorMessage = ThrowableUtil.getStackAsString(t); status = CreateResourceStatus.FAILURE; } // Send results back to the server CreateResourceResponse response = new CreateResourceResponse(requestId, resourceName, resourceKey, status, errorMessage, configuration); log.info("Sending create response to server: " + response); ResourceFactoryServerService serverService = resourceFactoryManager.getServerService(); if (serverService != null) { try { serverService.completeCreateResource(response); } catch (Throwable throwable) { log.error("Error received while attempting to complete report for request: " + requestId, throwable); } } // Trigger a service scan on the parent resource to have the newly created resource discovered if the plugin // said the create was successful if (runRuntimeScan && isSuccessStatus(status)) { log.info("Scanning for newly created Resource..."); try { InventoryManager inventoryManager = PluginContainer.getInstance().getInventoryManager(); inventoryManager.performServiceScan(parentResourceId); } catch (Throwable t) { log.error("Error received while attempting runtime scan for newly created Resource..."); } } return response; } private static boolean isSuccessStatus(CreateResourceStatus status) { return (status == CreateResourceStatus.SUCCESS) || (status == CreateResourceStatus.INVALID_CONFIGURATION) || (status == CreateResourceStatus.INVALID_ARTIFACT); } }