All Classes

Class	Description
AbstractBaseTriggerPolicy<T extends Serializable,S>
AllStreamGrouping	This is the stream grouping strategy that all tuples are transmitted to all instances of a bolt.
AlreadyAliveException
AssignableMetric<T>
BaseBasicBolt
BaseComponent
BaseComponentDeclarer<T extends ComponentConfigurationDeclarer<?>>
BaseConfigurationDeclarer<T extends ComponentConfigurationDeclarer<?>>
BaseRichBolt
BaseRichSpout
BaseStatefulWindowedBolt<K extends Serializable,V extends Serializable>
BaseTaskHook
BaseWindowedBolt
BaseWindowedBolt.Count	Holds a count value for count based windows and sliding intervals.
BasicBoltExecutor
BasicOutputCollector
BoltAckInfo
BoltDeclarer
BoltExecuteInfo
BoltFailInfo
Builder	Builder is used to register all sources.
BuilderImpl	BuilderImpl implements the Builder interface.
CombinedMetric<T>
ComplexSink<R>	ConsumerSink is a very simple Sink that basically invokes a user supplied consume function for every tuple.
ComplexSource<R>	SupplierSource is a way to wrap a supplier function inside a Heron Spout.
ComponentConfigurationDeclarer<T extends ComponentConfigurationDeclarer<?>>
ConcurrentCountMetric
Config	Topology configs are specified as a plain old map.
Config	Config is the way users configure the execution of the topology.
Config.Builder
Config.DeliverySemantics	An enum encapsulating the delivery semantics that can be applied to Heron topologies.
Config.Serializer	An enum encapsulating the serializers that can be used for data in the topology.
Config.TopologyReliabilityMode	What is the reliability mode under which we are running this topology Topology writers must set TOPOLOGY_RELIABILITY_MODE to one one of the following modes
Constants
ConsumerSink<R>	ConsumerSink is a very simple Sink that basically invokes a user supplied consume function for every tuple.
ConsumerStreamlet<R>	ConsumerStreamlet represents an empty Streamlet that is made up of elements from the parent streamlet after consuming every element.
Context	Context is the information available at runtime for operators like transform.
ContextImpl	Context is the information available at runtime for operators like transform.
CountByKeyAndWindowStreamlet<R,K>	CountByKeyAndWindowStreamlet represents a KVStreamlet that is the result of counting all elements within each window defined by a user supplied Window Config.
CountByKeyStreamlet<R,K>	ReduceByKeyAndWindowStreamlet represents a KVStreamlet that is the result of applying user supplied reduceFn on all elements within each window defined by a user supplied Window Config.
CountEvictionPolicy<T extends Serializable>	An eviction policy that tracks event counts and can evict based on a threshold count.
CountMetric
CountStatAndMetric	Acts as a Count Metric, but also keeps track of approximate counts for the last 10 mins, 3 hours, 1 day, and all time.
CountTriggerPolicy<T extends Serializable>	A trigger that tracks event counts and calls back TriggerHandler.onTrigger() when the count threshold is hit.
CountWindowConfig	CountWindowConfig implements a count based WindowConfig.
CumulativeCountMetric	This is a different kind of counter that value is not reset after fetched.
CustomStreamGrouping	This is the interface for user defined stream grouping strategies.
CustomStreamlet<R,T>	CustomStreamlet represents a Streamlet that is made up of applying the user supplied custom operator to each element of the parent streamlet.
CustomWindowConfig	CustomWindowConfig implements a trigger/eviction based WindowConfig.
DefaultEvictionContext
DefaultKryoFactory
DefaultKryoFactory.KryoSerializableDefault
DefaultMaxSpoutPendingTuner	This is a class that helps to auto tune the max spout pending value
DirectStreamGrouping	This is the stream grouping strategy that tuples are sent to the instance of choice.
EmitInfo
Event<T extends Serializable>	An event is a wrapper object that gets stored in the window.
EventImpl<T extends Serializable>
EvictionContext	Context information that can be used by the eviction policy
EvictionPolicy<T extends Serializable,S>	Eviction policy tracks events and decides whether an event should be evicted from the window or not.
EvictionPolicy.Action	The action to be taken when EvictionPolicy.evict(Event) is invoked.
FailedException
Fields
FieldsStreamGrouping	This is the stream grouping strategy that tuples are sent to the particular instance of the downstream bolt based on the values of a specified fields.
FilterOperator<R>	FilterOperator implements the functionality of the filter operation It takes in a filterFunction predicate as the input.
FilterStreamlet<R>	FilterStreamlet represents a Streamlet that is made up of elements from the parent Streamlet after applying a user supplied filter function.
FlatMapOperator<R,T>	FlatMapOperator is the class that implements the flatMap functionality.
FlatMapStreamlet<R,T>	FlatMapStreamlet represents a Streamlet that is made up of applying the user supplied flatMap function to each element of the parent streamlet and flattening out the result.
GeneralReduceByKeyAndWindowOperator<R,K,T>	ReduceByKeyAndWindowOperator is the class that implements reduceByKeyAndWindow functionality.
GeneralReduceByKeyAndWindowStreamlet<R,K,T>	ReduceByKeyAndWindowStreamlet represents a KVStreamlet that is the result of applying user supplied reduceFn on all elements within each window defined by a user supplied Window Config.
GeneralReduceByKeyOperator<R,K,T>	ReduceByKeyOperator is the class that implements the reduce functionality.
GeneralReduceByKeyStreamlet<R,K,T>	GeneralReduceByKeyStreamlet represents a KVStreamlet that is the result of applying user supplied reduceFn on all elements.
GeneralTopologyContext
GlobalMetrics	Singleton class which exposes a simple globally available counter for heron jobs.
GlobalStreamGrouping	This is the stream grouping strategy that all tuples are transmitted to a single instance of a bolt with the lowest task id.
HashMapState<K extends Serializable,V extends Serializable>	A State backed up by HashMap
HeronSubmitter	Use this class to submit topologies to run on the Heron cluster.
HeronTopology
IBasicBolt
IBasicOutputCollector
IBolt	An IBolt represents a component that takes tuples as input and produces tuples as output.
ICombiner<T>	Interface for classes that are able to combine multiple objects into one result.
IComponent	Common methods for all possible components in a topology.
IErrorReporter
IKryoDecorator
IKryoFactory	An interface that controls the Kryo instance used by Storm for serialization.
IMetric<T>	Interface for a metric that can be tracked
IMetricsRegister
IMultiSchemableSpout
InvalidTopologyException
IOutputCollector
IPluggableSerializer
IReducer<T,U,V>	Apply an update to an accumulator for which a result can be extracted.
IRichBolt	When writing topologies using Java, IRichBolt and IRichSpout are the main interfaces to use to implement components of the topology.
IRichSpout	When writing topologies using Java, IRichBolt and IRichSpout are the main interfaces to use to implement components of the topology.
ISchemableSpout
ISpout	ISpout is the core interface for implementing spouts.
ISpoutOutputCollector
IStatefulComponent<K extends Serializable,V extends Serializable>	Defines a component that saves its internal state in the State interface
IStatefulWindowedBolt<K extends Serializable,V extends Serializable>
IStreamletBasicOperator<R,T>	The interface for streamlet operators.
IStreamletOperator<R,T>	The base interface for all Streamlet operator interfaces.
IStreamletRichOperator<R,T>	The interface for custom operators: it can be used to create operators based on existing Bolts (subclasses of IRichBolt).
IStreamletWindowOperator<R,T>	The interface for streamlet operators.
ITaskHook
ITwoPhaseStatefulComponent<K extends Serializable,V extends Serializable>	Defines a stateful component that is aware of Heron topology's "two-phase commit".
IUpdatable	Bolt or spout instances should implement this method if they wish to be informed of changed to the topology context during the lifecycle of the instance.
IWindowedBolt	A bolt abstraction for supporting time and count based sliding & tumbling windows.
JavaSerializer
JoinCustomGrouping<R,K>	JoinCustomGrouping is the class that routes the incoming tuples into the JoinOperator.
JoinOperator<K,V1,V2,VR>	JoinOperator is the bolt that implements the join/leftJoin/innerJoin functionality.
JoinStreamlet<K,R,S,T>	JoinStreamlet represents a KVStreamlet that is the result of joining two KVStreamlets left and right using a WindowConfig.
JoinType
KeyByOperator<R,K,V>	KeyByOperator is the class that implements keyBy functionality.
KeyByStreamlet<R,K,V>	KeyByStreamlet represents a KVStreamlet that is the result of applying key and value extractors on all elements.
KeyedWindow<T>	Transformation depending on Windowing pass on the window/key information using this class
KeyValue<K,V>	Certain operations in the Streamlet API, like join/reduce, necessitate the concept of key value pairs.
KryoSerializer	KryoSerializer is a wrapper around Heron's IPluggableSerializer.
KryoSerializer	KryoSerializer has been moved to heron.api.serializer package so that it can be used by Heron topologies written in low level API.
KVStreamlet<K,V>	A KVStreamlet is a Streamlet with KeyValue data.
KVStreamletShadow<K,V>	KVStreamletShadow is a decorator for StreamletImpl> objects.
LatencyStatAndMetric	Acts as a Latency Metric, but also keeps track of approximate latency for the last 10 mins, 3 hours, 1 day, and all time.
LogSink<R>	LogSink is a very simple Bolt that implements the log functionality.
LogStreamlet<R>	LogStreamlet represents en empty Streamlet that is made up of elements from the parent streamlet after logging each element.
MapOperator<R,T>	MapOperator is the class that implements the map functionality.
MapStreamlet<R,T>	MapStreamlet represents a Streamlet that is made up of applying the user supplied map function to each element of the parent streamlet.
MeanReducer
MeanReducerState
MultiAssignableMetric<T extends Number>
MultiCountMetric
MultiReducedMetric<T,U,V>
MultiScheme
NoneStreamGrouping	This is the stream grouping strategy that is the same as shuffle grouping.
OutputCollector	This output collector exposes the API for emitting tuples from an IRichBolt.
OutputFieldsDeclarer
OutputFieldsGetter
Pair<T1,T2>	A pair of values.
RawMultiScheme
RawScheme
ReduceByKeyAndWindowCustomGrouping<R,K>	ReduceByKeyAndWindowCustomGrouping is the class that routes the incoming tuples into the ReduceByKeyAndWindowOperator.
ReduceByKeyAndWindowOperator<R,K,T>	ReduceByKeyAndWindowOperator is the class that implements reduceByKeyAndWindow functionality.
ReduceByKeyAndWindowStreamlet<R,K,T>	ReduceByKeyAndWindowStreamlet represents a KVStreamlet that is the result of applying user supplied reduceFn on all elements within each window defined by a user supplied Window Config.
ReduceByKeyOperator<R,K,T>	ReduceByKeyOperator is the class that implements the reduce functionality.
ReduceByKeyStreamlet<R,K,T>	ReduceByKeyStreamlet represents a KVStreamlet that is the result of applying user supplied reduceFn on all elements.
ReducedMetric<T,U,V>	Apply an update to an metric using an IReducer for which a result can be extracted.
RemapCustomGrouping<R>	RemapCustomGrouping is the class that routes the incoming tuples into the ReMapBolt.
RemapStreamlet<R>	RemapStreamlet represents a Streamlet that is the result of applying user supplied remapFn on all elements of its parent Streamlet.
ReportedFailedException
Runner	Runner is used to run a topology that is built by the builder.
Scheme
SchemeAsMultiScheme
SerializableBiFunction<A,B,C>	All user supplied transformation functions have to be serializable.
SerializableBinaryOperator<T>	All user supplied transformation functions have to be serializable.
SerializableConsumer<T>	All user supplied transformation functions have to be serializable.
SerializableFunction<A,B>	All user supplied transformation functions have to be serializable.
SerializablePredicate<T>	All user supplied transformation functions have to be serializable.
SerializableSerializer
SerializableSupplier<T>	All user supplied transformation functions have to be serializable.
SerializableTransformer<I,O>	All user supplied transformation functions have to be serializable.
ShuffleStreamGrouping	This is the stream grouping strategy that tuples are randomly distributed to instances of the bolt.
Sink<T>	Sink is how Streamlet's end.
SinkStreamlet<R>	SinkStreamlet represents en empty Streamlet that is made up of elements from the parent streamlet after consuming every element.
Slf4jUtils
Source<T>	Source is how Streamlet's originate.
SourceStreamlet<R>	SourceStreamlet is a very quick and flexible way of creating a Streamlet from a user supplied Generator Function.
SplitOperator<R>	SplitOperator is the class that implements the split functionality.
SplitStreamlet<R>	SplitStreamlet represents a Streamlet that splits an incoming stream into multiple streams using a split function.
SpoutAckInfo
SpoutDeclarer
SpoutFailInfo
SpoutOutputCollector	This output collector exposes the API for emitting tuples from an IRichSpout.
SpoutStreamlet<R>	SpoutStreamlet is a quick way of creating a Streamlet from an user supplied Spout object.
State<K extends Serializable,V extends Serializable>	State represents the state interface as seen by stateful bolts and spouts.
StatefulWindowedBoltExecutor<K extends Serializable,V extends Serializable>
StreamGrouping	This is the interface of stream grouping at runtime the tasks in the target bolt.
Streamlet<R>	A Streamlet is a (potentially unbounded) ordered collection of tuples.
StreamletBase<R>	A Streamlet is a (potentially unbounded) ordered collection of tuples.
StreamletBaseImpl<R>	A Streamlet is a (potentially unbounded) ordered collection of tuples.
StreamletBaseImpl.StreamletNamePrefix
StreamletImpl<R>	A Streamlet is a (potentially unbounded) ordered collection of tuples.
StreamletOperator<R,T>	The Bolt interface that other operators of the streamlet packages extend.
StreamletReducers	This class contains a few standard reduces that can be used with Streamlet reduce functions such as reduceByKeyAndWindow.
StreamletShadow<R>	StreamletShadow is a special kind of StreamletImpl object: - It is still an StreamletImpl therefore it supports all Streamlet functions like filter() and map(), and can be the parent object of other StreamletImpl objects.
StreamletSource	StreamletSource is the base class for all streamlet sources.
StreamletUtils
StreamletWindowOperator<R,T>	The Bolt interface that other windowed operators of the streamlet packages extend.
SupplierSource<R>	SupplierSource is a way to wrap a supplier function inside a Heron Spout.
SupplierStreamlet<R>	SupplierStreamlet is a very quick and flexible way of creating a Streamlet from an user supplied Supplier Function.
TimeEvictionPolicy<T extends Serializable>	Eviction policy that evicts events based on time duration.
TimestampExtractor	Interface to be implemented for extracting timestamp from a tuple.
TimeTriggerPolicy<T extends Serializable>	Invokes TriggerHandler.onTrigger() after the duration.
TimeWindowConfig	TimeWindowConfig implements a time based WindowConfig.
TopologyBuilder	TopologyBuilder exposes the Java API for specifying a topology for Heron to execute.
TopologyContext	A TopologyContext is given to bolts and spouts in their "prepare" and "open" methods, respectively.
TopologySubmissionException	Thrown to indicate that the application has attempted to submit an invalid topology.
TopologyUtils	Utility to process TopologyAPI.Topology proto
TransformOperator<R,T>	TransformOperator is the class that implements the transform functionality.
TransformStreamlet<R,T>	TransformStreamlet represents a Streamlet that is made up of applying the user supplied transform function to each element of the parent streamlet.
TriggerHandler	The callback fired by TriggerPolicy when the trigger condition is satisfied.
TriggerPolicy<T extends Serializable,S>	Triggers the window calculations based on the policy.
Tuple	The tuple is the main data structure in Heron.
TupleFieldTimestampExtractor	A TimestampExtractor that extracts timestamp from a specific field in the tuple.
TupleUtils
TupleWindow	A Window that contains Tuple objects.
TupleWindowImpl	Holds the expired, new and current tuples in a window.
UnionOperator<I>	UnionOperator is the class that implements the union functionality.
UnionStreamlet<I>	UnionStreamlet is a Streamlet composed of all the elements of two parent streamlets.
Utils
Values	A convenience class for making tuple values using new Values("field1", 2, 3) syntax.
WatermarkCountEvictionPolicy<T extends Serializable>	An eviction policy that tracks count based on watermark ts and evicts events up to the watermark based on a threshold count.
WatermarkCountTriggerPolicy<T extends Serializable>	A trigger policy that tracks event counts and sets the context for eviction policy to evict based on latest watermark time.
WaterMarkEvent<T extends Serializable>	Watermark event used for tracking progress of time when processing event based ts.
WaterMarkEventGenerator<T extends Serializable>	Tracks tuples across input streams and periodically emits watermark events.
WatermarkTimeEvictionPolicy<T extends Serializable>	An eviction policy that evicts events based on time duration taking watermark time and event lag into account.
WatermarkTimeTriggerPolicy<T extends Serializable>	Handles watermark events and triggers TriggerHandler.onTrigger() for each window interval that has events to be processed up to the watermark ts.
Window<T>	A view of events in a sliding window.
Window	Window is a container containing information about a particular window.
WindowConfig	WindowConfig allows Streamlet API users to program window configuration for operations that rely on windowing.
WindowedBoltExecutor	An IWindowedBolt wrapper that does the windowing of tuples.
WindowingConfigs
WindowLifecycleListener<T>	A callback for expiry, activation of events tracked by the WindowManager
WindowManager<T extends Serializable>	Tracks a window of events and fires WindowLifecycleListener callbacks on expiry of events or activation of the window due to TriggerPolicy.