org.apache.flink.runtime.state.filemerging

Class DirectoryStreamStateHandle

java.lang.Object

org.apache.flink.runtime.state.filemerging.DirectoryStreamStateHandle

All Implemented Interfaces:

Serializable, StateObject, StreamStateHandle

public class DirectoryStreamStateHandle
extends Object
implements StreamStateHandle

This state handle represents a directory, usually used to be registered to SharedStateRegistry to track the life cycle of the directory.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.runtime.state.StateObject

StateObject.StateObjectLocation, StateObject.StateObjectSizeStatsCollector

Constructor Summary

Constructors

Constructor and Description
DirectoryStreamStateHandle(org.apache.flink.core.fs.Path directory)

Method Summary

Modifier and Type	Method and Description
Optional<byte[]>	asBytesIfInMemory()
SharedStateRegistryKey	createStateRegistryKey()
void	discardState() Discards the state referred to and solemnly owned by this handle, to free up resources in the persistent storage.
boolean	equals(Object o)
org.apache.flink.core.fs.Path	getDirectory()
long	getStateSize() This handle usually used to track the life cycle of the directory, therefore a fake size is provided.
PhysicalStateHandleID	getStreamStateHandleID()
int	hashCode()
static DirectoryStreamStateHandle	of(org.apache.flink.core.fs.Path directory)
org.apache.flink.core.fs.FSDataInputStream	openInputStream() Returns an FSDataInputStream that can be used to read back the data that was previously written to the stream.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.flink.runtime.state.StateObject

collectSizeStats

Constructor Detail

DirectoryStreamStateHandle

public DirectoryStreamStateHandle(@Nonnull
                                  org.apache.flink.core.fs.Path directory)

Method Detail

openInputStream

public org.apache.flink.core.fs.FSDataInputStream openInputStream()

Description copied from interface: StreamStateHandle

Returns an FSDataInputStream that can be used to read back the data that was previously written to the stream.

Specified by:

openInputStream in interface StreamStateHandle

asBytesIfInMemory

public Optional<byte[]> asBytesIfInMemory()

Specified by:

asBytesIfInMemory in interface StreamStateHandle

Returns:

Content of this handle as bytes array if it is already in memory.

getStreamStateHandleID

public PhysicalStateHandleID getStreamStateHandleID()

Specified by:

getStreamStateHandleID in interface StreamStateHandle

Returns:

a unique identifier of this handle.

createStateRegistryKey

public SharedStateRegistryKey createStateRegistryKey()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

getDirectory

public org.apache.flink.core.fs.Path getDirectory()

discardState

public void discardState()
                  throws Exception

Description copied from interface: StateObject

Discards the state referred to and solemnly owned by this handle, to free up resources in the persistent storage. This method is called when the state represented by this object will not be used anymore.

Specified by:

discardState in interface StateObject

Throws:

Exception

getStateSize

public long getStateSize()

This handle usually used to track the life cycle of the directory, therefore a fake size is provided.

Specified by:

getStateSize in interface StateObject

Returns:

Size of the state in bytes.

of

public static DirectoryStreamStateHandle of(@Nonnull
                                            org.apache.flink.core.fs.Path directory)