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package javax.enterprise.concurrent;
import java.util.Map;
/**
* A task submitted to an {@link ManagedExecutorService} or
* {@link ManagedScheduledExecutorService} can optionally implement this
* interface to provide identifying information about the task, to provide
* a {@link ManagedTaskListener} to get notification of lifecycle events of
* the task, or to provide additional execution properties.
*
* See also {@link ManagedExecutors#managedTask(java.util.concurrent.Callable, java.util.Map, javax.enterprise.concurrent.ManagedTaskListener) ManagedExecutors.managedTask()}.
*
*
* @since 1.0
*/
public interface ManagedTask {
/**
* Execution property to be returned in {@link #getExecutionProperties()} or
* {@link ContextService#createContextualProxy(java.lang.Object, java.util.Map, java.lang.Class) 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".
*/
public static final String LONGRUNNING_HINT = "javax.enterprise.concurrent.LONGRUNNING_HINT";
/**
* Execution property to be returned in {@link #getExecutionProperties()} or
* {@link ContextService#createContextualProxy(java.lang.Object, java.util.Map, java.lang.Class) 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
* {@link javax.transaction.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
* {@link javax.transaction.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 {@link ManagedExecutorService} or a
* {@link ManagedScheduledExecutorService}, a
* {@link javax.transaction.UserTransaction} will be available.
*
*/
public static final String TRANSACTION = "javax.enterprise.concurrent.TRANSACTION";
/**
* Constant for the "SUSPEND" value of the TRANSACTION execution property.
* See {@link ManagedTask#TRANSACTION}.
*/
public static final String SUSPEND = "SUSPEND";
/**
* Constant for the "USE_TRANSACTION_OF_EXECUTION_THREAD" value of the
* TRANSACTION execution property.
* See {@link ManagedTask#TRANSACTION}.
*/
public static final String USE_TRANSACTION_OF_EXECUTION_THREAD = "USE_TRANSACTION_OF_EXECUTION_THREAD";
/**
* Execution property to be returned in {@link #getExecutionProperties()} or
* {@link ContextService#createContextualProxy(java.lang.Object, java.util.Map, java.lang.Class) 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.
*/
public static final String IDENTITY_NAME = "javax.enterprise.concurrent.IDENTITY_NAME";
/**
* The {@link ManagedTaskListener} to receive notification of lifecycle
* events of this task.
*
* @return The {@link ManagedTaskListener} to receive notification of
* lifecycle events of this task, or null if it is not necessary to get
* notified of such events.
*/
public ManagedTaskListener getManagedTaskListener();
/**
* Provides additional information to the {@link ManagedExecutorService} or
* {@link 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.".
*
* @return A Map<String, String> containing additional execution properties, or
* null if no additional information is provided for this task.
*/
public Map getExecutionProperties();
}