Package org.apache.samza.system

Interface Summary

Interface	Description
ExtendedSystemAdmin	Interface extends the more generic SystemAdmin interface TODO: Merge this interface method with SystemAdmin when we upgrade to JDK 1.8
SystemAdmin	Helper interface attached to an underlying system to fetch information about streams, partitions, offsets, etc.
SystemConsumer	SystemConsumer is the interface that must be implemented by any system that wishes to integrate with Samza.
SystemFactory	Build the SystemConsumer and SystemProducer for a particular system, as well as the accompanying SystemAdmin.
SystemProducer	SystemProducers are how Samza writes messages from StreamTasks to outside systems, such as messaging systems like Kafka, or file systems.
SystemStreamPartitionMatcher

Class Summary

Class	Description
ControlMessage	The abstract class of all control messages, containing the task that produces the control message, the total number of producer tasks, and a version number.
EndOfStreamMessage	The EndOfStreamMessage is a control message that is sent out to next stage once the task has consumed to the end of a bounded stream.
IncomingMessageEnvelope	This class represents a message envelope that is received by a StreamTask for each message that is received from a partition of a specific input stream.
OutgoingMessageEnvelope	An OutgoingMessageEnvelope is sent to a specified SystemStream via the appropriate SystemProducer from the user's StreamTask.
StreamSpec	StreamSpec is a blueprint for creating, validating, or simply describing a stream in the runtime environment.
SystemStream	Streams in Samza consist of both the stream name and the system to which the stream belongs.
SystemStreamMetadata	SystemAdmins use this class to return useful metadata about a stream's offset and partition information.
SystemStreamMetadata.SystemStreamPartitionMetadata	Provides offset information for a given SystemStreamPartition.
SystemStreamPartition	Aggregate object representing a both the SystemStream and Partition.
SystemStreamPartitionIterator	Iterator that wraps a SystemConsumer to iterate over the messages the consumer provides for the specified SystemStreamPartition.
WatermarkMessage	The WatermarkMessage is a control message that is sent out to next stage with a watermark timestamp and the task that produces the watermark.

Enum Summary

Enum	Description
MessageType	The type of the intermediate stream message.
SystemStreamMetadata.OffsetType	OffsetType is an enum used to define which offset should be used when reading from a SystemStreamPartition for the first time.

Exception Summary

Exception	Description
StreamValidationException
SystemProducerException