org.wso2.siddhi.core.util.snapshot

Interface Snapshotable

All Known Implementing Classes:

AbsentLogicalPreStateProcessor, AbsentStreamPreStateProcessor, AbstractAggregationAttributeExecutor, AbstractStreamProcessor, AggregateWindowProcessor, AggregationAttributeExecutor, AllPerEventOutputRateLimiter, AllPerTimeOutputRateLimiter, AttributeAggregator, AvgAttributeAggregator, CastFunctionExecutor, CoalesceFunctionExecutor, ConvertFunctionExecutor, CountAttributeAggregator, CountPreStateProcessor, CronWindowProcessor, CurrentTimeMillisFunctionExecutor, DefaultFunctionExecutor, DistinctCountAttributeAggregator, DistributedTransport, EventTimeBasedScheduler, EventTimestampFunctionExecutor, ExternalTimeBatchWindowProcessor, ExternalTimeWindowProcessor, FirstGroupByPerEventOutputRateLimiter, FirstGroupByPerTimeOutputRateLimiter, FirstPerEventOutputRateLimiter, FirstPerTimeOutputRateLimiter, FrequentWindowProcessor, FunctionExecutor, GroupByAggregationAttributeExecutor, IfThenElseFunctionExecutor, IncrementalStartTimeEndTimeFunctionExecutor, IncrementalTimeGetTimeZone, IncrementalUnixTimeFunctionExecutor, InMemorySink, InMemorySource, InMemoryTable, InstanceOfBooleanFunctionExecutor, InstanceOfDoubleFunctionExecutor, InstanceOfFloatFunctionExecutor, InstanceOfIntegerFunctionExecutor, InstanceOfLongFunctionExecutor, InstanceOfStringFunctionExecutor, LastGroupByPerEventOutputRateLimiter, LastGroupByPerTimeOutputRateLimiter, LastPerEventOutputRateLimiter, LastPerTimeOutputRateLimiter, LengthBatchWindowProcessor, LengthWindowProcessor, LogicalPreStateProcessor, LogSink, LogStreamProcessor, LossyFrequentWindowProcessor, MaxAttributeAggregator, MaxForeverAttributeAggregator, MaximumFunctionExecutor, MinAttributeAggregator, MinForeverAttributeAggregator, MinimumFunctionExecutor, MultiClientDistributedSink, OutputRateLimiter, PartitionRuntime, PassThroughOutputRateLimiter, Pol2CartStreamFunctionProcessor, Scheduler, ScriptFunctionExecutor, SingleClientDistributedSink, Sink, SinkHandler, SortWindowProcessor, Source, SourceHandler, StdDevAttributeAggregator, StreamFunctionProcessor, StreamPreStateProcessor, StreamProcessor, SumAttributeAggregator, SystemTimeBasedScheduler, TableWindowProcessor, TimeBatchWindowProcessor, TimeLengthWindowProcessor, TimeWindowProcessor, UUIDFunctionExecutor, Window, WindowProcessor, WindowWindowProcessor, WrappedSnapshotOutputRateLimiter

public interface Snapshotable

Parent interface which should be implemented by every processing elements of Siddhi event processing chain so that they can save the current state and poll for previous state in case of an issue.

Method Summary

Modifier and Type	Method and Description
Map<String,Object>	currentState() Used to collect the serializable state of the processing element, that need to be persisted for the reconstructing the element to the same state on a different point of time
String	getElementId()
void	restoreState(Map<String,Object> state) Used to restore serialized state of the processing element, for reconstructing the element to the same state as if was on a previous point of time.

Method Detail

currentState

Map<String,Object> currentState()

Used to collect the serializable state of the processing element, that need to be persisted for the reconstructing the element to the same state on a different point of time

Returns:

stateful objects of the processing element as an array

restoreState

void restoreState(Map<String,Object> state)

Used to restore serialized state of the processing element, for reconstructing the element to the same state as if was on a previous point of time.

Parameters:

state - the stateful objects of the element as an array on the same order provided by currentState().

getElementId

String getElementId()