OMQ::AbstractParallelReceiveStream Class Reference

this class handles stream classes that use an I/O thread to receive data More...

Inheritance diagram for OMQ::AbstractParallelReceiveStream:

Public Member Methods
	destructor ()
	disconnects and aborts the I/O thread if it's still running
nothing	cleanup ()
	called when the thread resource is still allocated and the thread exits or one of Qore::throw_thread_resource_exceptions() or Qore::throw_thread_resource_exceptions_to_mark() is called
private	abortInternMethod (string meth)
	if the I/O thread is running, then abort it, disconnect the connection, and throw a user-friendly exception what happened and how to avoid such situations in the future
private	abortIntern (string meth, string fmt)
	if the I/O thread is running, then abort it, disconnect the connection, and throw a user-friendly exception what happened and how to avoid such situations in the future

Private Member Methods
abstract	throwAbortedExceptionImpl (string meth)
	throw a user-friendly exception about why the I/O thread was aborted and the connection forcibly closed and how to avoid such situations in the future

Additional Inherited Members
Private:Internal Member Methods inherited from OMQ::AbstractParallelStream
	destructor ()
	wait for any I/O in progress to complete
nothing	cleanupBase ()
	called by child classes when the thread resource is still allocated and the thread exits or one of Qore::throw_thread_resource_exceptions() or Qore::throw_thread_resource_exceptions_to_mark() is called
private	waitIoComplete ()
	waits for the I/O thread to complete and returns
private	markIoInProgress ()
	marks the current connection as in progress; must be already checked beforehand that it's not in progress
private	markIoComplete ()
	performs thread cleanup on the background I/O thread if any is registered and running
OMQ::StreamInfo	getInfo ()
	returns performance information about the stream
private	checkError (string cmd)
	checks for an error in the background send thread; if there is one, then rethrows the exception in the main application / data thread
private	startStream ()
	opens the remote transaction by calling startStreamImpl() and starts the background I/O socket thread More...
private	socketThread (*ThreadLocalData my_tld)
	sets up thread-local data if possible and calls socketThreadImpl() that implements the background socket I/O for the object
private	abortIo (string reason)
	signals the end of queue operations
private bool	abortIoWait (string reason)
	signals the end of queue operations and waits until the socket thread terminates More...
private	beginTransaction (OMQ::DbStreamConfig m_config)
	starts or continues a remote transaction
private	commit (OMQ::DbStreamConfig m_config)
	commits a remote transaction
private	rollback (OMQ::DbStreamConfig m_config)
	rolls back a remote transaction
abstract OMQ::StreamConfig	config ()
	returns the configuration object
Qore::Thread::Counter	cnt ()
	confirmation counter for the socket I/O thread
OMQ::StreamInfo	m_info ()
	stream information
abstract	socketThreadImpl ()
	this method implements the background thread that handles the actual DataStream socket sends
abstract	startStreamImpl ()
	opens the remote transaction before starting the background I/O socket thread
Static Private:Internal Member Methods inherited from OMQ::AbstractParallelStream
static	staticCleanup ()
	performs static thread resource cleanup on I/O thread resources
static	checkStream (QorusSystemRestHelper helper, string op)
	checks if there is a stream operation running in the background, if so, a user-friendly exception is thrown
static	beginTransaction (QorusSystemRestHelper remote, string datasource, *timeout timeout_ms, *reference info)
	starts a transaction in a remote datasource More...
Private:Internal Attributes inherited from OMQ::AbstractParallelStream
const	DO_DISCONNECT = True
	A constant for rollback() methods to perform real disconnect.
const	DONT_DISCONNECT = False
	A constant for rollback() methods to keep the network connection alive.
Qore::Thread::Queue	dataq
	Queue for the socket I/O thread.
*hash	thread_ex
	exception info for send thread to communicate errors to the primary data thread
string	objid
	stream object identifier
const	StreamTerminatedError = "STREAM-TERMINATED"
	stream terminated error
const	ThreadKey = "_STREAM_"
	thread-local data key

Detailed Description

this class handles stream classes that use an I/O thread to receive data

such classes have the following characteristics:

• when aborting the I/O thread, the connection must be closed
• the destructor will abort any background I/O in progress, if the I/O thread is aborted, then it will disconnect the connection and throw a user-friendly exception explaining what went wrong and how to avoid it in the future
• whenever the main thread detects that all data has been received or a stream error has occured, the connection must be marked as available again (is call waitIoComplete())

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The documentation for this class was generated from the following file:

• Streams.qc