com.hazelcast.jet.core.processor

Class SourceProcessors

java.lang.Object

com.hazelcast.jet.core.processor.SourceProcessors

public final class SourceProcessors
extends Object

Static utility class with factories of source processors (the DAG entry points). For other kinds for a vertices refer to the package-level documentation.

Since:

Jet 3.0

Method Summary

Modifier and Type	Method and Description
static <C,T,S> ProcessorMetaSupplier	convenientSourceP(FunctionEx<? super Processor.Context,? extends C> createFn, BiConsumerEx<? super C,? super SourceBuilder.SourceBuffer<T>> fillBufferFn, FunctionEx<? super C,? extends S> createSnapshotFn, BiConsumerEx<? super C,? super List<S>> restoreSnapshotFn, ConsumerEx<? super C> destroyFn, int preferredLocalParallelism, boolean isBatch, Permission permission) Returns a supplier of processors for a source that the user can create using the SourceBuilder.
static <C,T,S> ProcessorMetaSupplier	convenientTimestampedSourceP(FunctionEx<? super Processor.Context,? extends C> createFn, BiConsumerEx<? super C,? super SourceBuilder.TimestampedSourceBuffer<T>> fillBufferFn, EventTimePolicy<? super T> eventTimePolicy, FunctionEx<? super C,? extends S> createSnapshotFn, BiConsumerEx<? super C,? super List<S>> restoreSnapshotFn, ConsumerEx<? super C> destroyFn, int preferredLocalParallelism) Returns a supplier of processors for a source that the user can create using the SourceBuilder.
static ProcessorMetaSupplier	readCacheP(String cacheName) Returns a supplier of processors for Sources.cache(String).
static <R> ProcessorMetaSupplier	readFilesP(String directory, Charset charset, String glob, boolean sharedFileSystem, BiFunctionEx<? super String,? super String,? extends R> mapOutputFn) Returns a supplier of processors for Sources.filesBuilder(java.lang.String).
static <I> ProcessorMetaSupplier	readFilesP(String directory, String glob, boolean sharedFileSystem, boolean ignoreFileNotFound, FunctionEx<? super Path,? extends Stream<I>> readFileFn) Returns a supplier of processors for FileSources.files(String) to read local files.
static <I> ProcessorMetaSupplier	readFilesP(String directory, String glob, boolean sharedFileSystem, FunctionEx<? super Path,? extends Stream<I>> readFileFn) Returns a supplier of processors for Sources.filesBuilder(java.lang.String).
static <T> ProcessorMetaSupplier	readJdbcP(DataConnectionRef dataConnectionRef, ToResultSetFunction resultSetFn, FunctionEx<? super ResultSet,? extends T> mapOutputFn) Returns a supplier of processors for Sources.jdbc( DataConnectionRef, ToResultSetFunction, FunctionEx).
static <T> ProcessorMetaSupplier	readJdbcP(String connectionURL, String query, FunctionEx<? super ResultSet,? extends T> mapOutputFn) Returns a supplier of processors for Sources.jdbc(String, String, FunctionEx).
static <T> ProcessorMetaSupplier	readJdbcP(SupplierEx<? extends Connection> newConnectionFn, ToResultSetFunction resultSetFn, FunctionEx<? super ResultSet,? extends T> mapOutputFn) Returns a supplier of processors for Sources.jdbc( SupplierEx, ToResultSetFunction, FunctionEx).
static ProcessorMetaSupplier	readListP(String listName) Returns a supplier of processors for Sources.list(String).
static ProcessorMetaSupplier	readMapP(String mapName) Returns a supplier of processors for Sources.map(String).
static <T,K,V> ProcessorMetaSupplier	readMapP(String mapName, Predicate<K,V> predicate, Projection<? super Map.Entry<K,V>,? extends T> projection) Returns a supplier of processors for Sources.map(String, Predicate, Projection).
static ProcessorSupplier	readRemoteCacheP(String cacheName, ClientConfig clientConfig) Returns a supplier of processors for Sources.remoteCache(String, ClientConfig).
static ProcessorMetaSupplier	readRemoteListP(String listName, ClientConfig clientConfig) Returns a supplier of processors for Sources.remoteList(String, ClientConfig).
static ProcessorSupplier	readRemoteMapP(String mapName, ClientConfig clientConfig) Returns a supplier of processors for Sources.remoteMap(String, ClientConfig).
static <T,K,V> ProcessorSupplier	readRemoteMapP(String mapName, ClientConfig clientConfig, Predicate<K,V> predicate, Projection<? super Map.Entry<K,V>,? extends T> projection) Returns a supplier of processors for Sources.remoteMap(String, ClientConfig, Predicate, Projection).
static <K,V> ProcessorMetaSupplier	streamCacheP(String cacheName, JournalInitialPosition initialPos, EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy) Returns a supplier of processors for Sources.cacheJournal(String, JournalInitialPosition).
static <T,K,V> ProcessorMetaSupplier	streamCacheP(String cacheName, PredicateEx<? super EventJournalCacheEvent<K,V>> predicateFn, FunctionEx<? super EventJournalCacheEvent<K,V>,? extends T> projectionFn, JournalInitialPosition initialPos, EventTimePolicy<? super T> eventTimePolicy) Returns a supplier of processors for Sources.cacheJournal(String, JournalInitialPosition, FunctionEx, PredicateEx).
static ProcessorMetaSupplier	streamFilesP(String watchedDirectory, Charset charset, String glob, boolean sharedFileSystem, BiFunctionEx<? super String,? super String,?> mapOutputFn) Returns a supplier of processors for Sources.filesBuilder(java.lang.String).
static <T> ProcessorMetaSupplier	streamJmsQueueP(String destination, ProcessingGuarantee maxGuarantee, EventTimePolicy<? super T> eventTimePolicy, SupplierEx<? extends javax.jms.Connection> newConnectionFn, FunctionEx<? super javax.jms.Session,? extends javax.jms.MessageConsumer> consumerFn, FunctionEx<? super javax.jms.Message,?> messageIdFn, FunctionEx<? super javax.jms.Message,? extends T> projectionFn) Returns a supplier of processors for Sources.jmsQueueBuilder(com.hazelcast.function.SupplierEx<? extends javax.jms.ConnectionFactory>).
static <T> ProcessorMetaSupplier	streamJmsTopicP(String destination, boolean isSharedConsumer, ProcessingGuarantee maxGuarantee, EventTimePolicy<? super T> eventTimePolicy, SupplierEx<? extends javax.jms.Connection> newConnectionFn, FunctionEx<? super javax.jms.Session,? extends javax.jms.MessageConsumer> consumerFn, FunctionEx<? super javax.jms.Message,?> messageIdFn, FunctionEx<? super javax.jms.Message,? extends T> projectionFn) Returns a supplier of processors for Sources.jmsTopicBuilder(com.hazelcast.function.SupplierEx<? extends javax.jms.ConnectionFactory>).
static <K,V> ProcessorMetaSupplier	streamMapP(String mapName, JournalInitialPosition initialPos, EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy) Returns a supplier of processors for Sources.mapJournal(String, JournalInitialPosition).
static <T,K,V> ProcessorMetaSupplier	streamMapP(String mapName, PredicateEx<? super EventJournalMapEvent<K,V>> predicateFn, FunctionEx<? super EventJournalMapEvent<K,V>,? extends T> projectionFn, JournalInitialPosition initialPos, EventTimePolicy<? super T> eventTimePolicy) Returns a supplier of processors for Sources.mapJournal(String, JournalInitialPosition, FunctionEx, PredicateEx).
static <K,V> ProcessorMetaSupplier	streamRemoteCacheP(String cacheName, ClientConfig clientConfig, JournalInitialPosition initialPos, EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy) Returns a supplier of processors for Sources.remoteCacheJournal(String, ClientConfig, JournalInitialPosition).
static <T,K,V> ProcessorMetaSupplier	streamRemoteCacheP(String cacheName, ClientConfig clientConfig, PredicateEx<? super EventJournalCacheEvent<K,V>> predicateFn, FunctionEx<? super EventJournalCacheEvent<K,V>,? extends T> projectionFn, JournalInitialPosition initialPos, EventTimePolicy<? super T> eventTimePolicy) Returns a supplier of processors for Sources.remoteCacheJournal(String, ClientConfig, JournalInitialPosition, FunctionEx, PredicateEx).
static <K,V> ProcessorMetaSupplier	streamRemoteMapP(String mapName, ClientConfig clientConfig, JournalInitialPosition initialPos, EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy) Returns a supplier of processors for Sources.remoteMapJournal(String, ClientConfig, JournalInitialPosition).
static <T,K,V> ProcessorMetaSupplier	streamRemoteMapP(String mapName, ClientConfig clientConfig, PredicateEx<? super EventJournalMapEvent<K,V>> predicateFn, FunctionEx<? super EventJournalMapEvent<K,V>,? extends T> projectionFn, JournalInitialPosition initialPos, EventTimePolicy<? super T> eventTimePolicy) Returns a supplier of processors for Sources.remoteMapJournal(String, ClientConfig, JournalInitialPosition, FunctionEx, PredicateEx).
static ProcessorMetaSupplier	streamSocketP(String host, int port, Charset charset) Returns a supplier of processors for Sources.socket(String, int, Charset).

Methods inherited from class java.lang.Object

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

Method Detail

readMapP

@Nonnull
public static ProcessorMetaSupplier readMapP(@Nonnull
                                                      String mapName)

Returns a supplier of processors for Sources.map(String).

readMapP

@Nonnull
public static <T,K,V> ProcessorMetaSupplier readMapP(@Nonnull
                                                              String mapName,
                                                              @Nonnull
                                                              Predicate<K,V> predicate,
                                                              @Nonnull
                                                              Projection<? super Map.Entry<K,V>,? extends T> projection)

Returns a supplier of processors for Sources.map(String, Predicate, Projection).

streamMapP

@Nonnull
public static <K,V> ProcessorMetaSupplier streamMapP(@Nonnull
                                                              String mapName,
                                                              @Nonnull
                                                              JournalInitialPosition initialPos,
                                                              @Nonnull
                                                              EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy)

Returns a supplier of processors for Sources.mapJournal(String, JournalInitialPosition).

streamMapP

@Nonnull
public static <T,K,V> ProcessorMetaSupplier streamMapP(@Nonnull
                                                                String mapName,
                                                                @Nonnull
                                                                PredicateEx<? super EventJournalMapEvent<K,V>> predicateFn,
                                                                @Nonnull
                                                                FunctionEx<? super EventJournalMapEvent<K,V>,? extends T> projectionFn,
                                                                @Nonnull
                                                                JournalInitialPosition initialPos,
                                                                @Nonnull
                                                                EventTimePolicy<? super T> eventTimePolicy)

Returns a supplier of processors for Sources.mapJournal(String, JournalInitialPosition, FunctionEx, PredicateEx).

readRemoteMapP

@Nonnull
public static ProcessorSupplier readRemoteMapP(@Nonnull
                                                        String mapName,
                                                        @Nonnull
                                                        ClientConfig clientConfig)

Returns a supplier of processors for Sources.remoteMap(String, ClientConfig).

readRemoteMapP

@Nonnull
public static <T,K,V> ProcessorSupplier readRemoteMapP(@Nonnull
                                                                String mapName,
                                                                @Nonnull
                                                                ClientConfig clientConfig,
                                                                @Nonnull
                                                                Predicate<K,V> predicate,
                                                                @Nonnull
                                                                Projection<? super Map.Entry<K,V>,? extends T> projection)

Returns a supplier of processors for Sources.remoteMap(String, ClientConfig, Predicate, Projection).

streamRemoteMapP

@Nonnull
public static <K,V> ProcessorMetaSupplier streamRemoteMapP(@Nonnull
                                                                    String mapName,
                                                                    @Nonnull
                                                                    ClientConfig clientConfig,
                                                                    @Nonnull
                                                                    JournalInitialPosition initialPos,
                                                                    @Nonnull
                                                                    EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy)

Returns a supplier of processors for Sources.remoteMapJournal(String, ClientConfig, JournalInitialPosition).

streamRemoteMapP

@Nonnull
public static <T,K,V> ProcessorMetaSupplier streamRemoteMapP(@Nonnull
                                                                      String mapName,
                                                                      @Nonnull
                                                                      ClientConfig clientConfig,
                                                                      @Nonnull
                                                                      PredicateEx<? super EventJournalMapEvent<K,V>> predicateFn,
                                                                      @Nonnull
                                                                      FunctionEx<? super EventJournalMapEvent<K,V>,? extends T> projectionFn,
                                                                      @Nonnull
                                                                      JournalInitialPosition initialPos,
                                                                      @Nonnull
                                                                      EventTimePolicy<? super T> eventTimePolicy)

Returns a supplier of processors for Sources.remoteMapJournal(String, ClientConfig, JournalInitialPosition, FunctionEx, PredicateEx).

readCacheP

@Nonnull
public static ProcessorMetaSupplier readCacheP(@Nonnull
                                                        String cacheName)

Returns a supplier of processors for Sources.cache(String).

streamCacheP

@Nonnull
public static <K,V> ProcessorMetaSupplier streamCacheP(@Nonnull
                                                                String cacheName,
                                                                @Nonnull
                                                                JournalInitialPosition initialPos,
                                                                @Nonnull
                                                                EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy)

Returns a supplier of processors for Sources.cacheJournal(String, JournalInitialPosition).

streamCacheP

@Nonnull
public static <T,K,V> ProcessorMetaSupplier streamCacheP(@Nonnull
                                                                  String cacheName,
                                                                  @Nonnull
                                                                  PredicateEx<? super EventJournalCacheEvent<K,V>> predicateFn,
                                                                  @Nonnull
                                                                  FunctionEx<? super EventJournalCacheEvent<K,V>,? extends T> projectionFn,
                                                                  @Nonnull
                                                                  JournalInitialPosition initialPos,
                                                                  @Nonnull
                                                                  EventTimePolicy<? super T> eventTimePolicy)

Returns a supplier of processors for Sources.cacheJournal(String, JournalInitialPosition, FunctionEx, PredicateEx).

readRemoteCacheP

@Nonnull
public static ProcessorSupplier readRemoteCacheP(@Nonnull
                                                          String cacheName,
                                                          @Nonnull
                                                          ClientConfig clientConfig)

Returns a supplier of processors for Sources.remoteCache(String, ClientConfig).

streamRemoteCacheP

@Nonnull
public static <K,V> ProcessorMetaSupplier streamRemoteCacheP(@Nonnull
                                                                      String cacheName,
                                                                      @Nonnull
                                                                      ClientConfig clientConfig,
                                                                      @Nonnull
                                                                      JournalInitialPosition initialPos,
                                                                      @Nonnull
                                                                      EventTimePolicy<? super Map.Entry<K,V>> eventTimePolicy)

Returns a supplier of processors for Sources.remoteCacheJournal(String, ClientConfig, JournalInitialPosition).

streamRemoteCacheP

@Nonnull
public static <T,K,V> ProcessorMetaSupplier streamRemoteCacheP(@Nonnull
                                                                        String cacheName,
                                                                        @Nonnull
                                                                        ClientConfig clientConfig,
                                                                        @Nonnull
                                                                        PredicateEx<? super EventJournalCacheEvent<K,V>> predicateFn,
                                                                        @Nonnull
                                                                        FunctionEx<? super EventJournalCacheEvent<K,V>,? extends T> projectionFn,
                                                                        @Nonnull
                                                                        JournalInitialPosition initialPos,
                                                                        @Nonnull
                                                                        EventTimePolicy<? super T> eventTimePolicy)

Returns a supplier of processors for Sources.remoteCacheJournal(String, ClientConfig, JournalInitialPosition, FunctionEx, PredicateEx).

readListP

@Nonnull
public static ProcessorMetaSupplier readListP(@Nonnull
                                                       String listName)

Returns a supplier of processors for Sources.list(String).

readRemoteListP

@Nonnull
public static ProcessorMetaSupplier readRemoteListP(@Nonnull
                                                             String listName,
                                                             @Nonnull
                                                             ClientConfig clientConfig)

Returns a supplier of processors for Sources.remoteList(String, ClientConfig).

streamSocketP

@Nonnull
public static ProcessorMetaSupplier streamSocketP(@Nonnull
                                                           String host,
                                                           int port,
                                                           @Nonnull
                                                           Charset charset)

Returns a supplier of processors for Sources.socket(String, int, Charset).

readFilesP

@Nonnull
public static <R> ProcessorMetaSupplier readFilesP(@Nonnull
                                                            String directory,
                                                            @Nonnull
                                                            Charset charset,
                                                            @Nonnull
                                                            String glob,
                                                            boolean sharedFileSystem,
                                                            @Nonnull
                                                            BiFunctionEx<? super String,? super String,? extends R> mapOutputFn)

Returns a supplier of processors for Sources.filesBuilder(java.lang.String). See FileSourceBuilder.build() for more details.

readFilesP

@Nonnull
public static <I> ProcessorMetaSupplier readFilesP(@Nonnull
                                                            String directory,
                                                            @Nonnull
                                                            String glob,
                                                            boolean sharedFileSystem,
                                                            @Nonnull
                                                            FunctionEx<? super Path,? extends Stream<I>> readFileFn)

Returns a supplier of processors for Sources.filesBuilder(java.lang.String). See FileSourceBuilder.build() for more details.

readFilesP

@Nonnull
public static <I> ProcessorMetaSupplier readFilesP(@Nonnull
                                                            String directory,
                                                            @Nonnull
                                                            String glob,
                                                            boolean sharedFileSystem,
                                                            boolean ignoreFileNotFound,
                                                            @Nonnull
                                                            FunctionEx<? super Path,? extends Stream<I>> readFileFn)

Returns a supplier of processors for FileSources.files(String) to read local files.

streamFilesP

@Nonnull
public static ProcessorMetaSupplier streamFilesP(@Nonnull
                                                          String watchedDirectory,
                                                          @Nonnull
                                                          Charset charset,
                                                          @Nonnull
                                                          String glob,
                                                          boolean sharedFileSystem,
                                                          @Nonnull
                                                          BiFunctionEx<? super String,? super String,?> mapOutputFn)

Returns a supplier of processors for Sources.filesBuilder(java.lang.String). See FileSourceBuilder.buildWatcher() for more details.

streamJmsQueueP

@Nonnull
public static <T> ProcessorMetaSupplier streamJmsQueueP(@Nullable
                                                                 String destination,
                                                                 @Nonnull
                                                                 ProcessingGuarantee maxGuarantee,
                                                                 @Nonnull
                                                                 EventTimePolicy<? super T> eventTimePolicy,
                                                                 @Nonnull
                                                                 SupplierEx<? extends javax.jms.Connection> newConnectionFn,
                                                                 @Nonnull
                                                                 FunctionEx<? super javax.jms.Session,? extends javax.jms.MessageConsumer> consumerFn,
                                                                 @Nonnull
                                                                 FunctionEx<? super javax.jms.Message,?> messageIdFn,
                                                                 @Nonnull
                                                                 FunctionEx<? super javax.jms.Message,? extends T> projectionFn)

Returns a supplier of processors for Sources.jmsQueueBuilder(com.hazelcast.function.SupplierEx<? extends javax.jms.ConnectionFactory>).

Parameters:

maxGuarantee - maximum processing guarantee for the source. You can use it to disable acknowledging in transactions to save transaction overhead

streamJmsTopicP

@Nonnull
public static <T> ProcessorMetaSupplier streamJmsTopicP(@Nullable
                                                                 String destination,
                                                                 boolean isSharedConsumer,
                                                                 @Nonnull
                                                                 ProcessingGuarantee maxGuarantee,
                                                                 @Nonnull
                                                                 EventTimePolicy<? super T> eventTimePolicy,
                                                                 @Nonnull
                                                                 SupplierEx<? extends javax.jms.Connection> newConnectionFn,
                                                                 @Nonnull
                                                                 FunctionEx<? super javax.jms.Session,? extends javax.jms.MessageConsumer> consumerFn,
                                                                 @Nonnull
                                                                 FunctionEx<? super javax.jms.Message,?> messageIdFn,
                                                                 @Nonnull
                                                                 FunctionEx<? super javax.jms.Message,? extends T> projectionFn)

Returns a supplier of processors for Sources.jmsTopicBuilder(com.hazelcast.function.SupplierEx<? extends javax.jms.ConnectionFactory>).

Parameters:

isSharedConsumer - true, if createSharedConsumer() or createSharedDurableConsumer() was used to create the consumer in the consumerFn

maxGuarantee - maximum processing guarantee for the source. You can use it to disable acknowledging in transactions to save transaction overhead

readJdbcP

public static <T> ProcessorMetaSupplier readJdbcP(@Nonnull
                                                  SupplierEx<? extends Connection> newConnectionFn,
                                                  @Nonnull
                                                  ToResultSetFunction resultSetFn,
                                                  @Nonnull
                                                  FunctionEx<? super ResultSet,? extends T> mapOutputFn)

Returns a supplier of processors for Sources.jdbc( SupplierEx, ToResultSetFunction, FunctionEx).

readJdbcP

public static <T> ProcessorMetaSupplier readJdbcP(@Nonnull
                                                  DataConnectionRef dataConnectionRef,
                                                  @Nonnull
                                                  ToResultSetFunction resultSetFn,
                                                  @Nonnull
                                                  FunctionEx<? super ResultSet,? extends T> mapOutputFn)

Returns a supplier of processors for Sources.jdbc( DataConnectionRef, ToResultSetFunction, FunctionEx).

Since:

5.2

readJdbcP

public static <T> ProcessorMetaSupplier readJdbcP(@Nonnull
                                                  String connectionURL,
                                                  @Nonnull
                                                  String query,
                                                  @Nonnull
                                                  FunctionEx<? super ResultSet,? extends T> mapOutputFn)

Returns a supplier of processors for Sources.jdbc(String, String, FunctionEx).

convenientSourceP

@Nonnull
public static <C,T,S> ProcessorMetaSupplier convenientSourceP(@Nonnull
                                                                       FunctionEx<? super Processor.Context,? extends C> createFn,
                                                                       @Nonnull
                                                                       BiConsumerEx<? super C,? super SourceBuilder.SourceBuffer<T>> fillBufferFn,
                                                                       @Nonnull
                                                                       FunctionEx<? super C,? extends S> createSnapshotFn,
                                                                       @Nonnull
                                                                       BiConsumerEx<? super C,? super List<S>> restoreSnapshotFn,
                                                                       @Nonnull
                                                                       ConsumerEx<? super C> destroyFn,
                                                                       int preferredLocalParallelism,
                                                                       boolean isBatch,
                                                                       @Nullable
                                                                       Permission permission)

Returns a supplier of processors for a source that the user can create using the SourceBuilder. This variant creates a source that emits items without timestamps.

Type Parameters:

C - type of the source's context object

T - type of items the source emits

S - type of object saved to state snapshot

Parameters:

createFn - function that creates the source's context object

fillBufferFn - function that fills Jet's buffer with items to emit

createSnapshotFn - function that returns a snapshot of the context object's state

restoreSnapshotFn - function that restores the context object's state from a snapshot

destroyFn - function that cleans up the resources held by the context object

preferredLocalParallelism - preferred local parallelism of the source vertex. Special values: -> use the cluster's default local parallelism; 0 -> create a single processor for the entire cluster (total parallelism = 1)

isBatch - true, if the fillBufferFn will call buffer.close(), that is whether the source reads a bounded or unbounded set of data

convenientTimestampedSourceP

@Nonnull
public static <C,T,S> ProcessorMetaSupplier convenientTimestampedSourceP(@Nonnull
                                                                                  FunctionEx<? super Processor.Context,? extends C> createFn,
                                                                                  @Nonnull
                                                                                  BiConsumerEx<? super C,? super SourceBuilder.TimestampedSourceBuffer<T>> fillBufferFn,
                                                                                  @Nonnull
                                                                                  EventTimePolicy<? super T> eventTimePolicy,
                                                                                  @Nonnull
                                                                                  FunctionEx<? super C,? extends S> createSnapshotFn,
                                                                                  @Nonnull
                                                                                  BiConsumerEx<? super C,? super List<S>> restoreSnapshotFn,
                                                                                  @Nonnull
                                                                                  ConsumerEx<? super C> destroyFn,
                                                                                  int preferredLocalParallelism)

Returns a supplier of processors for a source that the user can create using the SourceBuilder. This variant creates a source that emits timestamped events.

Type Parameters:

C - type of the context object

T - type of items the source emits

S - type of the object saved to state snapshot

Parameters:

createFn - function that creates the source's context object

fillBufferFn - function that fills Jet's buffer with items to emit

eventTimePolicy - parameters for watermark generation

createSnapshotFn - function that returns a snapshot of the context object's state

restoreSnapshotFn - function that restores the context object's state from a snapshot

destroyFn - function that cleans up the resources held by the context object

preferredLocalParallelism - preferred local parallelism of the source vertex. Special values: -> use the cluster's default local parallelism; 0 -> create a single processor for the entire cluster (total parallelism = 1)