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Tp::PendingOperation Class Reference

The PendingOperation class is a base class for pending asynchronous operations. More...

`#include <TelepathyQt/PendingOperation>`

Inherits QObject.

Inherited by Tp::Farstream::PendingChannel, Tp::PendingAccount, Tp::PendingCallContent, Tp::PendingCaptchas, Tp::PendingChannel, Tp::PendingChannelRequest, Tp::PendingComposite, Tp::PendingConnection, Tp::PendingContactAttributes, Tp::PendingContactInfo, Tp::PendingContacts, Tp::PendingDBusTubeConnection, Tp::PendingDebugMessageList, Tp::PendingFailure, Tp::PendingHandles, Tp::PendingReady, Tp::PendingSendMessage, Tp::PendingStreamedMediaStreams, Tp::PendingStreamTubeConnection, Tp::PendingString, Tp::PendingStringList, Tp::PendingSuccess, Tp::PendingVariant, Tp::PendingVariantMap, and Tp::PendingVoid.

## Signals

void | finished (Tp::PendingOperation *operation)

## Public Member Functions

virtual | ~PendingOperation ()
bool | isFinished () const
bool | isValid () const
bool | isError () const
QString | errorName () const
QString | errorMessage () const

## Protected Slots

void | setFinished ()
void | setFinishedWithError (const QString &name, const QString &message)
void | setFinishedWithError (const QDBusError &error)

## Protected Member Functions

| PendingOperation (const SharedPtr< RefCounted > &object)
SharedPtr< RefCounted > | object () const

## Detailed Description

The PendingOperation class is a base class for pending asynchronous operations.

This class represents an incomplete asynchronous operation, such as a D-Bus method call. When the operation has finished, it emits finished(). The slot or slots connected to the finished() signal may obtain additional information from the pending operation.

In simple cases, like a D-Bus method with no 'out' arguments or for which all 'out' arguments are to be ignored (so the possible results are success with no extra information, or failure with an error code), the trivial subclass PendingVoid can be used.

For pending operations that produce a result, another subclass of PendingOperation can be used, with additional methods that provide that result to the library user.

After finished() is emitted, the PendingOperation is automatically deleted using deleteLater(), so library users must not explicitly delete this object.

The design is loosely based on KDE's KJob.

See Asynchronous Object Model

## Constructor & Destructor Documentation

Tp::PendingOperation::~PendingOperation | ( |  | ) |

virtual

Class destructor.

Tp::PendingOperation::PendingOperation | ( | const SharedPtr< RefCounted > & | object | ) |

protected

Construct a new PendingOperation object.

Parameters

  object | The object on which this pending operation takes place.

## Member Function Documentation

bool Tp::PendingOperation::isFinished | ( |  | ) | const

Return whether or not the request has finished processing.

The signal finished() is emitted when this changes from `false` to true.

Equivalent to `(isValid() || isError())`.

Returns
  `true` if the request has finished, `false` otherwise.

See Also
  finished()

bool Tp::PendingOperation::isValid | ( |  | ) | const

Return whether or not the request completed successfully. If the request has not yet finished processing (isFinished() returns `false`), this cannot yet be known, and `false` will be returned.

Equivalent to `(isFinished() && !isError())`.

Returns
  `true` if the request has finished processing and has completed successfully, `false` otherwise.

bool Tp::PendingOperation::isError | ( |  | ) | const

Return whether or not the request resulted in an error.

If the request has not yet finished processing (isFinished() returns `false`), this cannot yet be known, and `false` will be returned.

Equivalent to `(isFinished() && !isValid())`.

Returns
  `true` if the request has finished processing and has resulted in an error, `false` otherwise.

QString Tp::PendingOperation::errorName | ( |  | ) | const

If isError() returns `true`, returns the D-Bus error with which the operation failed. If the operation succeeded or has not yet finished, returns an empty string.

Returns
  A D-Bus error name, or an empty string.

QString Tp::PendingOperation::errorMessage | ( |  | ) | const

If isError() would return `true`, returns a debugging message associated with the error, which may be an empty string. Otherwise, return an empty string.

Returns
  A debugging message, or an empty string.

void Tp::PendingOperation::finished | ( | Tp::PendingOperation * | operation | ) |

signal

Emitted when the pending operation finishes, i.e. when isFinished() changes from `false` to `true`.

Parameters

  operation | This operation object, from which further information may be obtained.

SharedPtr< RefCounted > Tp::PendingOperation::object | ( |  | ) | const

protected

Return the object on which this pending operation takes place.

Returns
  A pointer to a RefCounted object.

void Tp::PendingOperation::setFinished | ( |  | ) |

protected slot

Record that this pending operation has finished successfully, and emit the finished() signal next time the event loop runs.

void Tp::PendingOperation::setFinishedWithError | ( | const QString & | name,
|  | const QString & | message
| ) |  |

protected slot

Record that this pending operation has finished with an error, and emit the finished() signal next time the event loop runs.

Parameters

  name | The D-Bus error name, which must be non-empty.
  message | The debugging message.

void Tp::PendingOperation::setFinishedWithError | ( | const QDBusError & | error | ) |

protected slot

Record that this pending operation has finished with an error, and emit the finished() signal next time the event loop runs.

Parameters

  error | The error.

See Also
  finished()