javax.enterprise.concurrent

Interface ManagedTask

public interface ManagedTask

A task submitted to an ManagedExecutorService or ManagedScheduledExecutorService can optionally implement this interface to provide identifying information about the task, to provide a ManagedTaskListener to get notification of lifecycle events of the task, or to provide additional execution properties.

See also ManagedExecutors.managedTask().

Since:

1.0

Field Summary

Fields

Modifier and Type	Field and Description
static String	IDENTITY_NAME Execution property to be returned in getExecutionProperties() or ContextService.createContextualProxy() to provide a String that identifies the task.
static String	LONGRUNNING_HINT Execution property to be returned in getExecutionProperties() or ContextService.createContextualProxy() to provide hint about whether the task could take a long time to complete.
static String	SUSPEND Constant for the "SUSPEND" value of the TRANSACTION execution property.
static String	TRANSACTION Execution property to be returned in getExecutionProperties() or ContextService.createContextualProxy() to inform the Java™ EE Product Provider under which transaction should the task or proxy method of contextual proxy object be executed in.
static String	USE_TRANSACTION_OF_EXECUTION_THREAD Constant for the "USE_TRANSACTION_OF_EXECUTION_THREAD" value of the TRANSACTION execution property.

Method Summary

Modifier and Type	Method and Description
Map<String,String>	getExecutionProperties() Provides additional information to the ManagedExecutorService or ManagedScheduledExecutorService when executing this task.
ManagedTaskListener	getManagedTaskListener() The ManagedTaskListener to receive notification of lifecycle events of this task.

Field Detail

LONGRUNNING_HINT

static final String LONGRUNNING_HINT

Execution property to be returned in getExecutionProperties() or ContextService.createContextualProxy() to provide hint about whether the task could take a long time to complete. Java™ EE Product Providers may make use of this hint value to decide how to allocate thread resource for running this task. Valid values are "true" or "false".

See Also:

Constant Field Values

TRANSACTION

static final String TRANSACTION

Execution property to be returned in getExecutionProperties() or ContextService.createContextualProxy() to inform the Java™ EE Product Provider under which transaction should the task or proxy method of contextual proxy object be executed in. Valid values are:

"SUSPEND" (the default if unspecified) - Any transaction that is currently active on the thread will be suspended and a UserTransaction (accessible in the local JNDI namespace as "java:comp/UserTransaction") will be available. The original transaction, if any was active on the thread, will be resumed when the task or contextual proxy object method returns.

"USE_TRANSACTION_OF_EXECUTION_THREAD" - The contextual proxy object method will run within the transaction (if any) of the execution thread. A UserTransaction will only be available if it is also available in the execution thread (for example, when the proxy method is invoked from a Servlet or Bean Managed Transaction EJB). When there is no existing transaction on the execution thread, such as when running tasks that are submitted to a ManagedExecutorService or a ManagedScheduledExecutorService, a UserTransaction will be available.

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Constant Field Values

SUSPEND

static final String SUSPEND

Constant for the "SUSPEND" value of the TRANSACTION execution property. See TRANSACTION.

See Also:

Constant Field Values

USE_TRANSACTION_OF_EXECUTION_THREAD

static final String USE_TRANSACTION_OF_EXECUTION_THREAD

Constant for the "USE_TRANSACTION_OF_EXECUTION_THREAD" value of the TRANSACTION execution property. See TRANSACTION.

See Also:

Constant Field Values

IDENTITY_NAME

static final String IDENTITY_NAME

Execution property to be returned in getExecutionProperties() or ContextService.createContextualProxy() to provide a String that identifies the task. It may be the name or ID that allow management facilities to inspect the task to determine the intent of the task and its state. Implementations should not depend upon any thread execution context and should typically return only readily-available instance data to identify the task.

See Also:

Constant Field Values

Method Detail

getManagedTaskListener

ManagedTaskListener getManagedTaskListener()

The ManagedTaskListener to receive notification of lifecycle events of this task.

Returns:

The ManagedTaskListener to receive notification of lifecycle events of this task, or null if it is not necessary to get notified of such events.

getExecutionProperties

Map<String,String> getExecutionProperties()

Provides additional information to the ManagedExecutorService or ManagedScheduledExecutorService when executing this task.

Some standard property keys are defined in this class. Custom property keys may be defined but must not begin with "javax.enterprise.concurrent.".

Returns:

A Map<String, String> containing additional execution properties, or null if no additional information is provided for this task.