Package com.devexperts.qd

This package contains basic interfaces and other API elements of QD system which shall be sufficient for the client application programmer.

See: Description

Interface Summary

Interface	Description
DataConsumer	Deprecated Use RecordConsumer.
DataField	Common super-interface for DataIntField and DataObjField.
DataIntField	The DataIntField defines identity and access API for Int-fields.
DataIterator	The DataIterator defines protocol of serial access to the data using Iterator pattern.
DataListener	The DataListener is used to receive notifications about data availability in the corresponding data providers.
DataObjField	The DataObjField defines identity and access API for Obj-fields.
DataProvider	The DataProvider allows retrieval of accumulated data.
DataRecord	The DataRecord defines identity and content of generic data record.
DataScheme	The DataScheme defines overall scheme of data records and fields.
DataSchemeFactory	Creates data scheme instance for the given specification.
DataVisitor	The DataVisitor defines protocol of serial access to the data using Visitor pattern.
HistorySubscriptionFilter	Filter for history subscription to avoid memory overload with history.
QDAgent	The QDAgent represents an individual data consumer in the QDCollector.
QDAgent.AttachmentStrategy<T>
QDAgent.Builder	Builder for collector agents.
QDCollector	The QDCollector represents a hub which collects subscription from data consumers and distributes it among data providers and at the same time it collects data from data providers and distributes it among data consumers.
QDCollector.Builder<T extends QDCollector>	Builder for collectors.
QDCollector.Factory	Factory for QDCollector instances.
QDDistributor	The QDDistributor represents an individual data provider in the QDCollector.
QDDistributor.Builder	Builder for collector distributors.
QDErrorHandler	Error handler interface for exceptions in data and subscription listeners.
QDFilter.UpdateListener	Filter update notification interface.
QDHistory	The QDHistory represents a history-view of the data.
QDStream	The QDStream represents a stream-view of the data.
QDTicker	The QDTicker represents a ticker-view of the data.
StableSubscriptionFilter	Stable subscription filter has a fixed logic (it cannot depend on any external resources or state) and it is reconstructible from string by SubscriptionFilterFactory.
SubscriptionConsumer	Deprecated Use RecordConsumer.
SubscriptionContainer	The SubscriptionContainer represents data structure that keeps subscription in map-like fashion.
SubscriptionFilter	The SubscriptionFilter is used to block unwanted subscription.
SubscriptionFilterFactory	Deprecated Use QDFilterFactory instead.
SubscriptionIterator	The SubscriptionIterator provides serial access to subscription.
SubscriptionListener	The SubscriptionListener is used to receive notifications about subscription availability in the corresponding subscription providers.
SubscriptionProvider	The SubscriptionProvider allows retrieval of accumulated subscription.
SubscriptionVisitor	The SubscriptionVisitor provides serial access to subscription.
SymbolCodec	The SymbolCodec defines coding and serialization of symbols.
SymbolCodec.Resolver	Symbol resolver to reuse string symbol instances.
SymbolReceiver	The SymbolReceiver interface provides a way to retrieve encoded cipher-symbol pair from certain methods.
SymbolStriper	Symbol striping strategy that allows to split whole symbol universe into several smaller "stripes".

Class Summary

Class	Description
DataBuffer	Deprecated Use RecordBuffer instead.
QDFactory	The QDFactory creates implementations for core QD components.
QDFilter	Filter for QD data and subscription.
QDFilter.Updated	Represents the most recent (updated) version of the dynamic filter.
QDLog	Deprecated
SerialFieldType	Describes serial type of data fields that are transferred via QTP.
SerialFieldType.Bits	Bit patterns for serial field type ids.
SubscriptionBuffer	Deprecated Use RecordBuffer with a mode of SUBSCRIPTION or HISTORY_SUBSCRIPTION.
SymbolCodec.Reader	Stateful symbol reader.
SymbolCodec.Writer	Stateful symbol writer.
SymbolList

Enum Summary

Enum	Description
QDAgent.BufferOverflowStrategy	Strategy for handling of stream and history buffer overflow events.
QDContract	All available contracts for QDCollector.
QDFilter.Kind
QDFilter.SyntaxPrecedence

Annotation Types Summary

Annotation Type	Description
SpecificSubscriptionFilter	Describes project-specific subscription filter.

Package com.devexperts.qd Description

This package contains basic interfaces and other API elements of QD system which shall be sufficient for the client application programmer.

The general API of QD falls into several categories:

• Data definition API. It includes DataIntField, DataObjField, DataRecord, DataScheme and SymbolCodec (with SymbolReceiver).
• Data transfer API. It includes DataIterator, DataVisitor, DataConsumer, DataProvider (with DataListener) and DataBuffer.
• Subscription transfer API. It includes SubscriptionIterator, SubscriptionVisitor, SubscriptionConsumer, SubscriptionProvider (with SubscriptionListener) and SubscriptionBuffer.
• Subscription filtering API. It includes SubscriptionFilter.
• Consumer representation API. It includes QDAgent.
• Provider representation API. It includes QDDistributor.
• QD component API. It includes QDCollector, QDTicker, QDStream, QDHistory and QDFactory.

The specific APIs of QD required to create and operate specific subsystems are defined in other packages.

Most APIs have default implementations for common cases; these are placed according to their classification. See individual packages for details.