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oracle.as.scheduler.cp.exec
Class ExecutableWrapper

java.lang.Object
oracle.as.scheduler.cp.exec.ExecutableWrapper

All Implemented Interfaces:

Cancellable, Executable

public class ExecutableWrapper

extends java.lang.Object

implements Executable, Cancellable

This class is used to wrap the program executable to perform certain important tasks before control is handed off to the program executable and after control is returned from it.

This class replaces the program executable class as the ESS executable in the pre-processing phase. When ESS enters the execution stage, it run this class. At this point, this class performs two actions:

• Setup the RequestInfoMap for support classes
• Run the program executable

This class also implements the Cencellable interface. When cancel() is called on this class, it in turn inspects to see if the underlying program executable implements Cancellable and if yes, invokes it. Else no action is performed.

At the end of the execution, all open resources are closed and control is is returned back to ESS. If an unexpected error occurs during program execution, this error is caught, logged (to the request log file) and re-thrown appropriately.

Version:

$Header: ess/src/oracle/as/scheduler/cp/exec/ExecutableWrapper.java /main/6 2009/05/27 11:36:57 dcraft Exp $

Field Summary

static java.lang.String	JAVA_RUNTIME_RESOURCE_BUNDLE_BASE_NAME Constant representing the base name of CP Java Runtime Resouce Bundle.
static java.lang.String	LOGGER_PREFIX The prefix to use when logging messages via ODL.

Constructor Summary

ExecutableWrapper()

Method Summary

void	cancel() Implement the cancel() method in the Cancellable interface.
protected boolean	canLog(java.util.logging.Level level) Check if log message can be written to the ODL log at a particular level.
void	execute(RequestExecutionContext context, RequestParameters params) Implements the execute() method from the Executable interface.
protected void	init() Initialize instance variables

Methods inherited from class java.lang.Object

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

Field Detail

JAVA_RUNTIME_RESOURCE_BUNDLE_BASE_NAME

public static final java.lang.String JAVA_RUNTIME_RESOURCE_BUNDLE_BASE_NAME

Constant representing the base name of CP Java Runtime Resouce Bundle.

See Also:

Constant Field Values

LOGGER_PREFIX

public static final java.lang.String LOGGER_PREFIX

The prefix to use when logging messages via ODL.

See Also:

Constant Field Values

Constructor Detail

ExecutableWrapper

public ExecutableWrapper()

Method Detail

execute

public void execute(RequestExecutionContext context,
                    RequestParameters params)
             throws ExecutionErrorException,
                    ExecutionWarningException,
                    ExecutionCancelledException,
                    ExecutionPausedException

Implements the execute() method from the Executable interface.

Specified by:

execute in interface Executable

Parameters:

context - the context of the current request

params - the parameters associated with this request

Throws:

ExecutionErrorException - if an error occurs during execution

ExecutionWarningException - if an warning occurs during execution

ExecutionCancelledException - if execution is cancelled by the program for any reason

ExecutionPausedException - if the program logic wants to pause this request

See Also:

State

init

protected void init()

Initialize instance variables

cancel

public void cancel()

Implement the cancel() method in the Cancellable interface.

Specified by:

cancel in interface Cancellable

canLog

protected boolean canLog(java.util.logging.Level level)

Check if log message can be written to the ODL log at a particular level.

Parameters:

level - a Level value

Returns:

a boolean value

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