com.devexperts.qd

Interface QDTicker

All Superinterfaces:

QDCollector, QDStatsContainer, SubscriptionContainer

public interface QDTicker
extends QDCollector

The QDTicker represents a ticker-view of the data. In the ticker-view, only last data values are important and data events are generated only to bring data snapshot up-to-date. Such contract also allows QDTicker to provide random access to current data values.

Nested Class Summary

Nested classes/interfaces inherited from interface com.devexperts.qd.QDCollector

QDCollector.Builder<T extends QDCollector>, QDCollector.Factory

Method Summary

Modifier and Type	Method and Description
void	getData(RecordCursor.Owner owner, DataRecord record, int cipher, String symbol) Gets all data for the specified record, cipher, and symbol in a single call and sets RecordCursor via caller-provided RecordCursor.Owner to the corresponding memory storage in read-only mode.
boolean	getDataIfAvailable(RecordCursor.Owner owner, DataRecord record, int cipher, String symbol) Gets all data for the specified record, cipher, and symbol in a single call and sets RecordCursor via caller-provided RecordCursor.Owner to the corresponding memory storage in read-only mode if the corresponding data is available in the storage.
boolean	getDataIfSubscribed(RecordCursor.Owner owner, DataRecord record, int cipher, String symbol)
int	getInt(DataIntField field, int cipher, String symbol) Returns current value of specified Int-field.
Object	getObj(DataObjField field, int cipher, String symbol) Returns current value of specified Obj-field.
boolean	isAvailable(DataRecord record, int cipher, String symbol) Determines if value of specified record is available.

Methods inherited from interface com.devexperts.qd.QDCollector

agentBuilder, buildAgent, buildDistributor, close, createAgent, createAgent, createDistributor, createDistributor, distributorBuilder, examineData, examineData, examineDataBySubscription, executeLockBoundTask, getContract, getScheme, getStriper, getSymbol, hasEventTimeSequence, isStoreEverything, remove, setErrorHandler, setStoreEverything, setStoreEverythingFilter

Methods inherited from interface com.devexperts.qd.SubscriptionContainer

examineSubscription, examineSubscription, getSubscriptionSize, isSubscribed

Methods inherited from interface com.devexperts.qd.stats.QDStatsContainer

getStats

Method Detail

isAvailable

boolean isAvailable(DataRecord record,
                    int cipher,
                    String symbol)

Determines if value of specified record is available.

getInt

int getInt(DataIntField field,
           int cipher,
           String symbol)

Returns current value of specified Int-field. Returns 0 if such value does not exist or is unknown.

getObj

Object getObj(DataObjField field,
              int cipher,
              String symbol)

Returns current value of specified Obj-field. Returns null if such value does not exist or is unknown.

getData

void getData(RecordCursor.Owner owner,
             DataRecord record,
             int cipher,
             String symbol)

Gets all data for the specified record, cipher, and symbol in a single call and sets RecordCursor via caller-provided RecordCursor.Owner to the corresponding memory storage in read-only mode. This way, any fields can be retried from ticker without requiring any actual data copy or memory allocation.

getDataIfAvailable

boolean getDataIfAvailable(RecordCursor.Owner owner,
                           DataRecord record,
                           int cipher,
                           String symbol)

Gets all data for the specified record, cipher, and symbol in a single call and sets RecordCursor via caller-provided RecordCursor.Owner to the corresponding memory storage in read-only mode if the corresponding data is available in the storage. If the data was available then this method returns true. If the data was not available then this method returns false and the cursor is not changed.

Returns:

true if the data was available, false otherwise.

getDataIfSubscribed

boolean getDataIfSubscribed(RecordCursor.Owner owner,
                            DataRecord record,
                            int cipher,
                            String symbol)