OpenDDS::DCPS::ContentFilteredTopicImpl Class Reference

#include <ContentFilteredTopicImpl.h>

Inheritance diagram for OpenDDS::DCPS::ContentFilteredTopicImpl:

Collaboration diagram for OpenDDS::DCPS::ContentFilteredTopicImpl:

Public Member Functions
	ContentFilteredTopicImpl (const char name, DDS::Topic_ptr related_topic, const char filter_expression, DomainParticipantImpl *participant)
virtual	~ContentFilteredTopicImpl ()
char *	get_filter_expression ()
DDS::ReturnCode_t	get_expression_parameters (DDS::StringSeq &parameters)
DDS::ReturnCode_t	set_expression_parameters (const DDS::StringSeq &parameters)
DDS::Topic_ptr	get_related_topic ()
template<typename Sample >
bool	filter (const Sample &s) const
void	add_reader (DataReaderImpl &reader)
void	remove_reader (DataReaderImpl &reader)
const char *	get_filter_class_name () const
Private Member Functions
typedef	OPENDDS_VECTOR (WeakRcHandle< DataReaderImpl >) Readers
Private Attributes
OPENDDS_STRING	filter_expression_
FilterEvaluator	filter_eval_
DDS::StringSeq	expression_parameters_
DDS::Topic_var	related_topic_
Readers	readers_
ACE_Recursive_Thread_Mutex	lock_
	Concurrent access to expression_parameters_ and readers_.

Detailed Description

Definition at line 28 of file ContentFilteredTopicImpl.h.

Constructor & Destructor Documentation

OpenDDS::DCPS::ContentFilteredTopicImpl::ContentFilteredTopicImpl	(	const char *	name,
		DDS::Topic_ptr	related_topic,
		const char *	filter_expression,
		DomainParticipantImpl *	participant
	)

Definition at line 21 of file ContentFilteredTopicImpl.cpp.

References _duplicate(), ACE_TEXT(), OpenDDS::DCPS::DCPS_debug_level, filter_eval_, LM_DEBUG, and OpenDDS::DCPS::FilterEvaluator::number_parameters().

00024   : TopicDescriptionImpl(name,
00025       CORBA::String_var(related_topic->get_type_name()),
00026       dynamic_cast<TopicDescriptionImpl*>(related_topic)->get_type_support(),
00027       participant)
00028   , filter_expression_(filter_expression)
00029   , filter_eval_(filter_expression, false /*allowOrderBy*/)
00030   , related_topic_(DDS::Topic::_duplicate(related_topic))
00031 {
00032   if (DCPS_debug_level > 5) {
00033     ACE_DEBUG((LM_DEBUG,
00034       ACE_TEXT("(%P|%t) ContentFilteredTopicImpl::ContentFilteredTopicImpl() - ")
00035       ACE_TEXT("Creating cft with filter <%C> which requires <%d> parameters\n"),
00036       filter_expression, filter_eval_.number_parameters()));
00037   }
00038 }

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virtual OpenDDS::DCPS::ContentFilteredTopicImpl::~ContentFilteredTopicImpl ( ) [inline, virtual]

Definition at line 35 of file ContentFilteredTopicImpl.h.

00035 {}

Member Function Documentation

void OpenDDS::DCPS::ContentFilteredTopicImpl::add_reader ( DataReaderImpl & reader )

Definition at line 124 of file ContentFilteredTopicImpl.cpp.

References lock_, and readers_.

Referenced by OpenDDS::DCPS::DataReaderImpl::enable_filtering().

00125 {
00126   // readers_ does not own or reference-count the reader because
00127   // the readers reference this CFT and this CFT can't be removed
00128   // until all readers are gone (DomainParticipant::delete_contentfilteredtopic)
00129   ACE_GUARD(ACE_Recursive_Thread_Mutex, guard, lock_);
00130   readers_.push_back(reader);
00131 }

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template<typename Sample >

bool OpenDDS::DCPS::ContentFilteredTopicImpl::filter ( const Sample & s ) const [inline]

Definition at line 46 of file ContentFilteredTopicImpl.h.

00047   {
00048     ACE_GUARD_RETURN(ACE_Recursive_Thread_Mutex, guard, lock_, false);
00049     return filter_eval_.eval(s, expression_parameters_);
00050   }

DDS::ReturnCode_t OpenDDS::DCPS::ContentFilteredTopicImpl::get_expression_parameters ( DDS::StringSeq & parameters )

Definition at line 46 of file ContentFilteredTopicImpl.cpp.

References expression_parameters_, lock_, DDS::RETCODE_OK, and DDS::RETCODE_OUT_OF_RESOURCES.

00047 {
00048   ACE_GUARD_RETURN(ACE_Recursive_Thread_Mutex, guard, lock_,
00049     DDS::RETCODE_OUT_OF_RESOURCES);
00050   params = expression_parameters_;
00051   return DDS::RETCODE_OK;
00052 }

const char* OpenDDS::DCPS::ContentFilteredTopicImpl::get_filter_class_name ( ) const [inline]

Definition at line 55 of file ContentFilteredTopicImpl.h.

00056   {
00057     return filter_eval_.usesExtendedGrammar () ? "OPENDDSSQL" : "DDSSQL";
00058   }

char * OpenDDS::DCPS::ContentFilteredTopicImpl::get_filter_expression ( )

Implements DDS::ContentFilteredTopic.

Definition at line 40 of file ContentFilteredTopicImpl.cpp.

References filter_expression_, and FACE::string_dup().

00041 {
00042   return CORBA::string_dup(filter_expression_.c_str());
00043 }

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DDS::Topic_ptr OpenDDS::DCPS::ContentFilteredTopicImpl::get_related_topic ( )

Implements DDS::ContentFilteredTopic.

Definition at line 118 of file ContentFilteredTopicImpl.cpp.

References CORBA::LocalObject::_duplicate(), and related_topic_.

Referenced by OpenDDS::DCPS::SubscriberImpl::create_datareader().

00119 {
00120   return DDS::Topic::_duplicate(related_topic_);
00121 }

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typedef OpenDDS::DCPS::ContentFilteredTopicImpl::OPENDDS_VECTOR ( WeakRcHandle< DataReaderImpl > ) [private]

void OpenDDS::DCPS::ContentFilteredTopicImpl::remove_reader ( DataReaderImpl & reader )

Definition at line 134 of file ContentFilteredTopicImpl.cpp.

References lock_, readers_, and OpenDDS::DCPS::remove().

00135 {
00136   ACE_GUARD(ACE_Recursive_Thread_Mutex, guard, lock_);
00137   Readers::iterator end = readers_.end();
00138   readers_.erase(std::remove(readers_.begin(), end, reader), end);
00139 }

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DDS::ReturnCode_t OpenDDS::DCPS::ContentFilteredTopicImpl::set_expression_parameters ( const DDS::StringSeq & parameters )

Definition at line 61 of file ContentFilteredTopicImpl.cpp.

References ACE_TEXT(), OpenDDS::DCPS::DCPS_debug_level, expression_parameters_, filter_eval_, len, LM_ERROR, lock_, OpenDDS::DCPS::FilterEvaluator::number_parameters(), readers_, DDS::RETCODE_ERROR, DDS::RETCODE_OK, DDS::RETCODE_OUT_OF_RESOURCES, and OpenDDS::DCPS::swap().

00062 {
00063   ACE_GUARD_RETURN(ACE_Recursive_Thread_Mutex, guard, lock_,
00064     DDS::RETCODE_OUT_OF_RESOURCES);
00065 
00066   const CORBA::ULong len = p.length();
00067 
00068   // Check sequence of strings that give values to the 'parameters' (i.e., "%n" tokens)
00069   // in the filter_expression matches the size of the parameter sequence.
00070   // The tokens start with 0 which means that when the maximum number used is 1 we need
00071   // two parameters: %0 and %1
00072   if (len != filter_eval_.number_parameters()) {
00073     if (DCPS_debug_level > 1) {
00074         ACE_ERROR((LM_ERROR,
00075           ACE_TEXT("(%P|%t) ContentFilteredTopicImpl::set_expression_parameters() - ")
00076           ACE_TEXT("passed incorrect set of filter parameters, expected %d received %d\n"),
00077           filter_eval_.number_parameters(), len));
00078     }
00079     return DDS::RETCODE_ERROR;
00080   }
00081 
00082   if (len == expression_parameters_.length()) {
00083     const char* const* p_buf = p.get_buffer();
00084     char* const* e_buf = expression_parameters_.get_buffer();
00085 #ifdef _MSC_VER
00086 #pragma warning(push)
00087 #pragma warning(disable : 4996)
00088 #endif
00089     if (std::equal(&p_buf[0], &p_buf[len], &e_buf[0], string_equal)) {
00090       // no change, bail out now to avoid remote InfoRepo calls
00091       return DDS::RETCODE_OK;
00092     }
00093 #ifdef _MSC_VER
00094 #pragma warning(pop)
00095 #endif
00096   }
00097 
00098   expression_parameters_ = p;
00099 
00100   Readers readers_still_alive;
00101 
00102   for (Readers::iterator iter = readers_.begin(),
00103        end = readers_.end(); iter != end; ++iter) {
00104     DataReaderImpl_rch reader = iter->lock();
00105     if (reader) {
00106       reader->update_subscription_params(p);
00107       readers_still_alive.push_back(*iter);
00108     }
00109   }
00110 
00111   using namespace std;
00112   swap(readers_, readers_still_alive);
00113 
00114   return DDS::RETCODE_OK;
00115 }