ThreadWeaver::DependencyPolicy

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#include <dependencypolicy.h>

Inheritance diagram for ThreadWeaver::DependencyPolicy:

Public Member Functions

 ~DependencyPolicy () override
 
void addDependency (const Dependency &dep)
 
void addDependency (JobPointer jobA, JobPointer jobB)
 
bool canRun (JobPointer) override
 
void destructed (JobInterface *job) override
 
void free (JobPointer) override
 
bool isEmpty () const
 
void release (JobPointer) override
 
bool removeDependency (const Dependency &dep)
 
bool removeDependency (JobPointer jobA, JobPointer jobB)
 
void resolveDependencies (JobPointer)
 

Static Public Member Functions

static DependencyPolicyinstance ()
 

Protected Member Functions

bool hasUnresolvedDependencies (JobPointer) const
 

Detailed Description

DependencyPolicy implements execution-time dependencies dependencies between Jobs.

To declare that Job B can only be executed when Job A is finished, call addDependency.

Be aware of circular dependencies. All dependencies on a Job will be removed if the Job object is destructed. Sequence uses dependencies to implement the ordered execution of the sequence elements.

Definition at line 32 of file dependencypolicy.h.

Constructor & Destructor Documentation

◆ ~DependencyPolicy()

DependencyPolicy::~DependencyPolicy ( )
override

Destructor.

Definition at line 54 of file dependencypolicy.cpp.

Member Function Documentation

◆ addDependency()

void DependencyPolicy::addDependency ( JobPointer  jobA,
JobPointer  jobB 
)

Add jobB as a dependency of jobA.

jobA will only be executed after jobB has been successfully processed.

Parameters
jobAthe depending job
jobBthe job jobA depends on

Definition at line 59 of file dependencypolicy.cpp.

◆ canRun()

bool DependencyPolicy::canRun ( JobPointer  )
overridevirtual

canRun() is called before the job is executed.

The job will only be executed if canRun() returns true.

Implements ThreadWeaver::QueuePolicy.

Definition at line 166 of file dependencypolicy.cpp.

◆ destructed()

void DependencyPolicy::destructed ( JobInterface *  job)
overridevirtual

destructing() is called when a Job that has this queue policy assigned gets destructed.

Implements ThreadWeaver::QueuePolicy.

Definition at line 191 of file dependencypolicy.cpp.

◆ free()

void DependencyPolicy::free ( JobPointer  )
overridevirtual

free() is called after the job has been executed.

It is guaranteed that free is called only after canRun() returned true at an earlier time.

Implements ThreadWeaver::QueuePolicy.

Definition at line 172 of file dependencypolicy.cpp.

◆ hasUnresolvedDependencies()

bool DependencyPolicy::hasUnresolvedDependencies ( JobPointer  job) const
protected

Query whether the job has an unresolved dependency.

In case it does, the policy will return false from canRun().

Definition at line 147 of file dependencypolicy.cpp.

◆ release()

void DependencyPolicy::release ( JobPointer  )
overridevirtual

release() is called if canRun() returned true, but the job has not been executed for external reasons.

For example, a second QueuePolicy could have returned false from canRun() for the same job.

Implements ThreadWeaver::QueuePolicy.

Definition at line 185 of file dependencypolicy.cpp.

◆ removeDependency()

bool DependencyPolicy::removeDependency ( JobPointer  jobA,
JobPointer  jobB 
)

Remove a dependency.

The dependency of jobA on jobB is removed. If no dependencies are left for jobA, canRun will return true. Returns false if the given object is not dependency of this job.

Parameters
jobAthe depending job
jobBthe job jobA depends on
Returns
true if dependency existed, false otherwise

Definition at line 79 of file dependencypolicy.cpp.

◆ resolveDependencies()

void DependencyPolicy::resolveDependencies ( JobPointer  job)

Resolve all dependencies for a job.

This method is called after the Job has been finished, or when it is deleted without being executed (performed by the destructor). The method will remove all entries stating that another Job depends on this one.

Definition at line 110 of file dependencypolicy.cpp.


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