Library: Foundation
Package: Threading
Header: Poco/ActiveResult.h
Description
Creates an ActiveResultHolder. Pauses the caller until the result becomes available. Waits up to the specified interval for the result to become available. Returns true if the result became available, false otherwise. Waits up to the specified interval for the result to become available. Throws a TimeoutException if the result did not became available. Notifies the invoking thread that the result became available. Returns true if the active method failed (and threw an exception). Information about the exception can be obtained by calling error(). If the active method threw an exception, a textual representation of the exception is returned. An empty string is returned if the active method completed successfully. If the active method threw an exception, a clone of the exception object is returned, otherwise null. Sets the exception. Sets the exception. This class holds the result of an asynchronous method invocation (see class ActiveMethod). It is used to pass the result from the execution thread back to the invocation thread.
Member Summary
Member Functions: available, data, error, exception, failed, notify, operator =, swap, tryWait, wait
Types
ActiveResultHolderType
typedef ActiveResultHolder < ResultType > ActiveResultHolderType;
ResultType
typedef RT ResultType;
Constructors
ActiveResult 
ActiveResult(
ActiveResultHolderType * pHolder
);
Creates the active result. For internal use only.
ActiveResult
ActiveResult(
const ActiveResult & result
);
Copy constructor.
Destructor
~ActiveResult
~ActiveResult();
Destroys the result.
Member Functions
available
bool available() const;
Returns true if a result is available.
data
ResultType & data() const;
Returns a reference to the result data.
data
void data(
ResultType * pValue
);
data
ResultType & data();
Returns a non-const reference to the result data. For internal use only.
error
std::string error() const;
If the active method threw an exception, a textual representation of the exception is returned. An empty string is returned if the active method completed successfully.
error
void error(
const std::string & msg
);
Sets the failed flag and the exception message.
error
void error(
const Exception & exc
);
Sets the failed flag and the exception message.
exception
Exception * exception() const;
If the active method threw an exception, a clone of the exception object is returned, otherwise null.
failed
bool failed() const;
Returns true if the active method failed (and threw an exception). Information about the exception can be obtained by calling error().
notify
void notify();
Notifies the invoking thread that the result became available. For internal use only.
operator =
ActiveResult & operator = (
const ActiveResult & result
);
Assignment operator.
swap
void swap(
ActiveResult & result
) noexcept;
tryWait
bool tryWait(
long milliseconds
);
Waits up to the specified interval for the result to become available. Returns true if the result became available, false otherwise.
wait
void wait();
Pauses the caller until the result becomes available.
wait
void wait(
long milliseconds
);
Waits up to the specified interval for the result to become available. Throws a TimeoutException if the result did not became available.