org.camunda.bpm.engine

Class ProcessEngines

java.lang.Object

org.camunda.bpm.engine.ProcessEngines

public abstract class ProcessEngines
extends Object

Helper for initializing and closing process engines in server environments.
All created ProcessEngines will be registered with this class.
The activiti-webapp-init webapp will call the init() method when the webapp is deployed and it will call the destroy() method when the webapp is destroyed, using a context-listener (org.camunda.bpm.engine.test.impl.servlet.listener.ProcessEnginesServletContextListener). That way, all applications can just use the getProcessEngines() to obtain pre-initialized and cached process engines.

Please note that there is no lazy initialization of process engines, so make sure the context-listener is configured or ProcessEngines are already created so they were registered on this class.

The init() method will try to build one ProcessEngine for each camunda.cfg.xml file found on the classpath. If you have more then one, make sure you specify different process.engine.name values.

Author:

Tom Baeyens, Joram Barrez

Field Summary

Fields

Modifier and Type	Field and Description
protected static boolean	isInitialized
static String	NAME_DEFAULT
protected static List<ProcessEngineInfo>	processEngineInfos
protected static Map<String,ProcessEngineInfo>	processEngineInfosByName
protected static Map<String,ProcessEngineInfo>	processEngineInfosByResourceUrl
protected static Map<String,ProcessEngine>	processEngines

Constructor Summary

Constructors

Constructor and Description
ProcessEngines()

Method Summary

Modifier and Type	Method and Description
static void	destroy() closes all process engines.
static ProcessEngine	getDefaultProcessEngine()
static ProcessEngine	getDefaultProcessEngine(boolean forceCreate)
static ProcessEngine	getProcessEngine(String processEngineName)
static ProcessEngine	getProcessEngine(String processEngineName, boolean forceCreate) obtain a process engine by name.
static ProcessEngineInfo	getProcessEngineInfo(String processEngineName) Get initialization results.
static List<ProcessEngineInfo>	getProcessEngineInfos() Get initialization results.
static Map<String,ProcessEngine>	getProcessEngines() provides access to process engine to application clients in a managed server environment.
static void	init()
static void	init(boolean forceCreate) Initializes all process engines that can be found on the classpath for resources camunda.cfg.xml (plain Activiti style configuration) and for resources activiti-context.xml (Spring style configuration).
protected static void	initProcessEngineFromSpringResource(URL resource)
static void	registerProcessEngine(ProcessEngine processEngine) Registers the given process engine.
static ProcessEngineInfo	retry(String resourceUrl) retries to initialize a process engine that previously failed.
static void	unregister(ProcessEngine processEngine) Unregisters the given process engine.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NAME_DEFAULT

public static final String NAME_DEFAULT

See Also:

Constant Field Values

isInitialized

protected static boolean isInitialized

processEngines

protected static Map<String,ProcessEngine> processEngines

processEngineInfosByName

protected static Map<String,ProcessEngineInfo> processEngineInfosByName

processEngineInfosByResourceUrl

protected static Map<String,ProcessEngineInfo> processEngineInfosByResourceUrl

processEngineInfos

protected static List<ProcessEngineInfo> processEngineInfos

Constructor Detail

ProcessEngines

public ProcessEngines()

Method Detail

init

public static void init()

init

public static void init(boolean forceCreate)

Initializes all process engines that can be found on the classpath for resources camunda.cfg.xml (plain Activiti style configuration) and for resources activiti-context.xml (Spring style configuration).

initProcessEngineFromSpringResource

protected static void initProcessEngineFromSpringResource(URL resource)

registerProcessEngine

public static void registerProcessEngine(ProcessEngine processEngine)

Registers the given process engine. No ProcessEngineInfo will be available for this process engine. An engine that is registered will be closed when the destroy() is called.

unregister

public static void unregister(ProcessEngine processEngine)

Unregisters the given process engine.

getProcessEngineInfos

public static List<ProcessEngineInfo> getProcessEngineInfos()

Get initialization results.

getProcessEngineInfo

public static ProcessEngineInfo getProcessEngineInfo(String processEngineName)

Get initialization results. Only info will we available for process engines which were added in the init(). No ProcessEngineInfo is available for engines which were registered programatically.

getDefaultProcessEngine

public static ProcessEngine getDefaultProcessEngine()

getDefaultProcessEngine

public static ProcessEngine getDefaultProcessEngine(boolean forceCreate)

getProcessEngine

public static ProcessEngine getProcessEngine(String processEngineName)

getProcessEngine

public static ProcessEngine getProcessEngine(String processEngineName,
                                             boolean forceCreate)

obtain a process engine by name.

Parameters:

processEngineName - is the name of the process engine or null for the default process engine.

retry

public static ProcessEngineInfo retry(String resourceUrl)

retries to initialize a process engine that previously failed.

getProcessEngines

public static Map<String,ProcessEngine> getProcessEngines()

provides access to process engine to application clients in a managed server environment.

destroy

public static void destroy()

closes all process engines. This method should be called when the server shuts down.