com.hazelcast.cache.impl.journal

Class CacheEventJournalReadOperation<K,V,T>

java.lang.Object

com.hazelcast.spi.Operation

com.hazelcast.internal.journal.EventJournalReadOperation<T,InternalEventJournalCacheEvent>

com.hazelcast.cache.impl.journal.CacheEventJournalReadOperation<K,V,T>

Type Parameters:

T - the return type of the projection. It is equal to the journal event type if the projection is null or it is the identity projection

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, BlockingOperation, AllowedDuringPassiveState, PartitionAwareOperation, ReadonlyOperation

public class CacheEventJournalReadOperation<K,V,T>
extends EventJournalReadOperation<T,InternalEventJournalCacheEvent>

Reads from the cache event journal in batches. You may specify the start sequence, the minumum required number of items in the response, the maximum number of items in the response, a predicate that the events should pass and a projection to apply to the events in the journal. If the event journal currently contains less events than the required minimum, the call will wait until it has sufficient items. The predicate, filter and projection may be null in which case all elements are returned and no projection is applied.

Since:

3.9

Field Summary

Fields

Modifier and Type	Field and Description
protected Predicate<? super EventJournalCacheEvent<K,V>>	predicate
protected Function<? super EventJournalCacheEvent<K,V>,? extends T>	projection

Fields inherited from class com.hazelcast.internal.journal.EventJournalReadOperation

maxSize, minSize, name, namespace, resultSet, sequence, startSequence

Fields inherited from class com.hazelcast.spi.Operation

GENERIC_PARTITION_ID

Constructor Summary

Constructors

Constructor and Description
CacheEventJournalReadOperation()
CacheEventJournalReadOperation(String cacheName, long startSequence, int minSize, int maxSize, Predicate<? super EventJournalCacheEvent<K,V>> predicate, Function<? super EventJournalCacheEvent<K,V>,? extends T> projection)

Method Summary

Modifier and Type	Method and Description
protected ReadResultSetImpl<InternalEventJournalCacheEvent,T>	createResultSet()
int	getFactoryId() Returns DataSerializableFactory factory ID for this class.
int	getId() Returns type identifier for this class.
protected EventJournal<InternalEventJournalCacheEvent>	getJournal()
String	getServiceName()
protected void	readInternal(ObjectDataInput in)
protected void	writeInternal(ObjectDataOutput out)

Methods inherited from class com.hazelcast.internal.journal.EventJournalReadOperation

beforeRun, getResponse, getWaitKey, onWaitExpire, run, shouldWait

Methods inherited from class com.hazelcast.spi.Operation

afterRun, call, executedLocally, getCallerAddress, getCallerUuid, getCallId, getCallTimeout, getConnection, getInvocationTime, getLogger, getNodeEngine, getOperationResponseHandler, getPartitionId, getReplicaIndex, getService, getWaitTimeout, isUrgent, logError, onExecutionFailure, onInvocationException, onSetCallId, readData, requiresExplicitServiceName, returnsResponse, sendResponse, setCallerUuid, setNodeEngine, setOperationResponseHandler, setPartitionId, setReplicaIndex, setService, setServiceName, setValidateTarget, setWaitTimeout, toString, toString, validatesTarget, writeData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.hazelcast.nio.serialization.DataSerializable

readData, writeData

Methods inherited from interface com.hazelcast.spi.PartitionAwareOperation

getPartitionId

Methods inherited from interface com.hazelcast.spi.BlockingOperation

getWaitTimeout

Field Detail

predicate

protected Predicate<? super EventJournalCacheEvent<K,V>> predicate

projection

protected Function<? super EventJournalCacheEvent<K,V>,? extends T> projection

Constructor Detail

CacheEventJournalReadOperation

public CacheEventJournalReadOperation()

CacheEventJournalReadOperation

public CacheEventJournalReadOperation(String cacheName,
                                      long startSequence,
                                      int minSize,
                                      int maxSize,
                                      Predicate<? super EventJournalCacheEvent<K,V>> predicate,
                                      Function<? super EventJournalCacheEvent<K,V>,? extends T> projection)

Method Detail

getJournal

protected EventJournal<InternalEventJournalCacheEvent> getJournal()

Specified by:

getJournal in class EventJournalReadOperation<T,InternalEventJournalCacheEvent>

getFactoryId

public int getFactoryId()

Description copied from interface: IdentifiedDataSerializable

Returns DataSerializableFactory factory ID for this class.

Returns:

factory ID

getId

public int getId()

Description copied from interface: IdentifiedDataSerializable

Returns type identifier for this class. It should be unique per DataSerializableFactory.

Returns:

type ID

getServiceName

public String getServiceName()

Specified by:

getServiceName in class EventJournalReadOperation<T,InternalEventJournalCacheEvent>

writeInternal

protected void writeInternal(ObjectDataOutput out)
                      throws IOException

Overrides:

writeInternal in class EventJournalReadOperation<T,InternalEventJournalCacheEvent>

Throws:

IOException

readInternal

protected void readInternal(ObjectDataInput in)
                     throws IOException

Overrides:

readInternal in class EventJournalReadOperation<T,InternalEventJournalCacheEvent>

Throws:

IOException

createResultSet

protected ReadResultSetImpl<InternalEventJournalCacheEvent,T> createResultSet()

Specified by:

createResultSet in class EventJournalReadOperation<T,InternalEventJournalCacheEvent>