com.hazelcast.config

Class EventJournalConfig

java.lang.Object

com.hazelcast.config.EventJournalConfig

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable

public class EventJournalConfig
extends Object
implements IdentifiedDataSerializable

Configuration for an event journal. The event journal keeps events related to a specific partition and data structure. For instance, it could keep map add, update, remove, merge events along with the key, old value, new value and so on. This configuration is not tied to a specific data structure and can be reused. NOTE This config is intended to be used with Hazelcast Jet and does not expose any features in Hazelcast IMDG.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_CAPACITY Default value of capacity of the event journal.
static int	DEFAULT_TTL_SECONDS Default value for the time to live property.

Constructor Summary

Constructors

Constructor and Description
EventJournalConfig()
EventJournalConfig(EventJournalConfig config) Clones a EventJournalConfig.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
int	getCapacity() Gets the capacity of the event journal.
int	getClassId() Returns type identifier for this class.
int	getFactoryId() Returns DataSerializableFactory factory ID for this class.
int	getTimeToLiveSeconds() Gets the time to live in seconds.
int	hashCode()
boolean	isEnabled() Returns if the event journal is enabled.
void	readData(ObjectDataInput in) Reads fields from the input stream
EventJournalConfig	setCapacity(int capacity) Sets the capacity of the event journal.
EventJournalConfig	setEnabled(boolean enabled) Enables or disables the event journal.
EventJournalConfig	setTimeToLiveSeconds(int timeToLiveSeconds) Sets the time to live in seconds.
String	toString()
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_CAPACITY

public static final int DEFAULT_CAPACITY

Default value of capacity of the event journal.

See Also:

Constant Field Values

DEFAULT_TTL_SECONDS

public static final int DEFAULT_TTL_SECONDS

Default value for the time to live property.

See Also:

Constant Field Values

Constructor Detail

EventJournalConfig

public EventJournalConfig()

EventJournalConfig

public EventJournalConfig(EventJournalConfig config)

Clones a EventJournalConfig.

Parameters:

config - the event journal config to clone

Throws:

NullPointerException - if the config is null

Method Detail

getCapacity

public int getCapacity()

Gets the capacity of the event journal. The capacity is the total number of items that the event journal can hold at any moment. The actual number of items contained in the journal can be lower.

NOTE The capacity is shared equally between all partitions. This is done by assigning each partition getCapacity() / partitionCount available slots in the event journal. Because of this, the effective total capacity may be somewhat lower and you must make sure that the configured capacity is at least greater than the partition count.

Returns:

the capacity.

setCapacity

public EventJournalConfig setCapacity(int capacity)

Sets the capacity of the event journal. The capacity is the total number of items that the event journal can hold at any moment. The actual number of items contained in the journal can be lower.

NOTE The capacity is shared equally between all partitions. This is done by assigning each partition getCapacity() / partitionCount available slots in the event journal. Because of this, the effective total capacity may be somewhat lower and you must make sure that the configured capacity is at least greater than the partition count.

Parameters:

capacity - the capacity.

Returns:

the updated config.

Throws:

IllegalArgumentException - if capacity smaller than 1.

See Also:

getCapacity()

getTimeToLiveSeconds

public int getTimeToLiveSeconds()

Gets the time to live in seconds.

Returns:

the time to live in seconds. Returns 0 the time to live if the items don't expire.

setTimeToLiveSeconds

public EventJournalConfig setTimeToLiveSeconds(int timeToLiveSeconds)

Sets the time to live in seconds. Time to live is the time the event journal retains items before removing them from the journal. The events are removed on journal read and write actions, not while the journal is idle.

Time to live can be disabled by setting timeToLiveSeconds to 0. This means that the events never expire but they can be overwritten when the capacity of the journal is exceeded.

Parameters:

timeToLiveSeconds - the time to live period in seconds

Returns:

the updated config

Throws:

IllegalArgumentException - if timeToLiveSeconds smaller than 0.

toString

public String toString()

Overrides:

toString in class Object

isEnabled

public boolean isEnabled()

Returns if the event journal is enabled.

Returns:

true if the event journal is enabled, false otherwise

setEnabled

public EventJournalConfig setEnabled(boolean enabled)

Enables or disables the event journal.

Parameters:

enabled - true if enabled, false otherwise.

Returns:

the updated config.

getFactoryId

public int getFactoryId()

Description copied from interface: IdentifiedDataSerializable

Returns DataSerializableFactory factory ID for this class.

Specified by:

getFactoryId in interface IdentifiedDataSerializable

Returns:

factory ID

getClassId

public int getClassId()

Description copied from interface: IdentifiedDataSerializable

Returns type identifier for this class. It should be unique per DataSerializableFactory.

Specified by:

getClassId in interface IdentifiedDataSerializable

Returns:

type ID

writeData

public void writeData(ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Parameters:

out - output

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

readData

public void readData(ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Parameters:

in - input

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the input stream has been closed.

equals

public final boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public final int hashCode()

Overrides:

hashCode in class Object