org.camunda.bpm.engine.impl
Class DefaultPriorityProvider<T>

java.lang.Object
  org.camunda.bpm.engine.impl.DefaultPriorityProvider<T>

Type Parameters:

T - the type of the param to determine the priority

All Implemented Interfaces:

PriorityProvider<T>

Direct Known Subclasses:

DefaultExternalTaskPriorityProvider, DefaultJobPriorityProvider

public abstract class DefaultPriorityProvider<T>
extends Object
implements PriorityProvider<T>

Represents a default priority provider, which contains some functionality to evaluate the priority. Can be used as base class for other priority providers. *

Author:

Christopher Zell

Field Summary

static long	DEFAULT_PRIORITY The default priority.
static long	DEFAULT_PRIORITY_ON_RESOLUTION_FAILURE The default priority in case of resolution failure.

Constructor Summary

DefaultPriorityProvider()

Method Summary

long	determinePriority(ExecutionEntity execution, T param)
protected Long	evaluateValueProvider(ParameterValueProvider valueProvider, ExecutionEntity execution, String errorMessageHeading) Evaluates a given value provider with the given execution entity to determine the correct value.
long	getDefaultPriority() Returns the default priority.
long	getDefaultPriorityOnResolutionFailure() Returns the default priority in case of resolution failure.
protected Long	getProcessDefinedPriority(ProcessDefinitionImpl processDefinition, String propertyKey, ExecutionEntity execution, String errorMsgHead) Returns the priority which is defined in the given process definition.
protected abstract Long	getProcessDefinitionPriority(ExecutionEntity execution, T param) Returns the priority defined in the process definition.
protected abstract Long	getSpecificPriority(ExecutionEntity execution, T param) Returns the priority defined in the specific entity.
protected boolean	isSymptomOfContextSwitchFailure(Throwable t, ExecutionEntity contextExecution)
protected boolean	isValidLongValue(Number value) Checks if the given number is a valid long value.
protected abstract void	logNotDeterminingPriority(ExecutionEntity execution, Object value, ProcessEngineException e) Logs the exception which was thrown if the priority can not be determined.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_PRIORITY

public static long DEFAULT_PRIORITY

The default priority.

DEFAULT_PRIORITY_ON_RESOLUTION_FAILURE

public static long DEFAULT_PRIORITY_ON_RESOLUTION_FAILURE

The default priority in case of resolution failure.

Constructor Detail

DefaultPriorityProvider

public DefaultPriorityProvider()

Method Detail

getDefaultPriority

public long getDefaultPriority()

Returns the default priority.

Returns:

the default priority

getDefaultPriorityOnResolutionFailure

public long getDefaultPriorityOnResolutionFailure()

Returns the default priority in case of resolution failure.

Returns:

the default priority

evaluateValueProvider

protected Long evaluateValueProvider(ParameterValueProvider valueProvider,
                                     ExecutionEntity execution,
                                     String errorMessageHeading)

Evaluates a given value provider with the given execution entity to determine the correct value. The error message heading is used for the error message if the validation fails because the value is no valid priority.

Parameters:

valueProvider - the provider which contains the value

execution - the execution entity

errorMessageHeading - the heading which is used for the error message

Returns:

the valid priority value

determinePriority

public long determinePriority(ExecutionEntity execution,
                              T param)

Specified by:

determinePriority in interface PriorityProvider<T>

Parameters:

execution - may be null when the job is not created in the context of a running process instance (e.g. a timer start event)

Returns:

the determined priority

getSpecificPriority

protected abstract Long getSpecificPriority(ExecutionEntity execution,
                                            T param)

Returns the priority defined in the specific entity. Like a job definition priority or an activity priority. The result can also be null in that case the process priority will be used.

Parameters:

execution - the current execution

param - the generic param

Returns:

the specific priority

getProcessDefinitionPriority

protected abstract Long getProcessDefinitionPriority(ExecutionEntity execution,
                                                     T param)

Returns the priority defined in the process definition. Can also be null in that case the fallback is the default priority.

Parameters:

execution - the current execution

param - the generic param

Returns:

the priority defined in the process definition

getProcessDefinedPriority

protected Long getProcessDefinedPriority(ProcessDefinitionImpl processDefinition,
                                         String propertyKey,
                                         ExecutionEntity execution,
                                         String errorMsgHead)

Returns the priority which is defined in the given process definition. The priority value is identified with the given propertyKey. Returns null if the process definition is null or no priority was defined.

Parameters:

processDefinition - the process definition that should contains the priority

propertyKey - the key which identifies the property

execution - the current execution

errorMsgHead - the error message header which is used if the evaluation fails

Returns:

the priority defined in the given process

logNotDeterminingPriority

protected abstract void logNotDeterminingPriority(ExecutionEntity execution,
                                                  Object value,
                                                  ProcessEngineException e)

Logs the exception which was thrown if the priority can not be determined.

Parameters:

execution - the current execution entity

value - the current value

e - the exception which was catched

isSymptomOfContextSwitchFailure

protected boolean isSymptomOfContextSwitchFailure(Throwable t,
                                                  ExecutionEntity contextExecution)

isValidLongValue

protected boolean isValidLongValue(Number value)

Checks if the given number is a valid long value.

Parameters:

value - the number which should be checked

Returns:

true if is a valid long value, false otherwise