com.netflix.hollow.core.util

Class StateEngineRoundTripper

java.lang.Object

com.netflix.hollow.core.util.StateEngineRoundTripper

public class StateEngineRoundTripper
extends java.lang.Object

A utility to create and keep up-to-date a HollowReadStateEngine from a HollowWriteStateEngine

Constructor Summary

Constructors

Constructor and Description
StateEngineRoundTripper()

Method Summary

Modifier and Type	Method and Description
static void	roundTripDelta(HollowWriteStateEngine writeEngine, HollowReadStateEngine readEngine) Update the provided HollowReadStateEngine with the new state currently available in the HollowWriteStateEngine.
static HollowReadStateEngine	roundTripSnapshot(HollowWriteStateEngine writeEngine)
static void	roundTripSnapshot(HollowWriteStateEngine writeEngine, HollowReadStateEngine readEngine) Populate the provided HollowReadStateEngine with the dataset currently in the provided HollowWriteStateEngine
static void	roundTripSnapshot(HollowWriteStateEngine writeEngine, HollowReadStateEngine readEngine, HollowFilterConfig filter) Populate the provided HollowReadStateEngine with the dataset currently in the provided HollowWriteStateEngine.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StateEngineRoundTripper

public StateEngineRoundTripper()

Method Detail

roundTripSnapshot

public static HollowReadStateEngine roundTripSnapshot(HollowWriteStateEngine writeEngine)
                                               throws java.io.IOException

Parameters:

writeEngine - the write state engine

Returns:

a brand-new HollowReadStateEngine with the dataset populated in the provided HollowWriteStateEngine

Throws:

java.io.IOException - if the round trip from write to read state failed

roundTripSnapshot

public static void roundTripSnapshot(HollowWriteStateEngine writeEngine,
                                     HollowReadStateEngine readEngine)
                              throws java.io.IOException

Populate the provided HollowReadStateEngine with the dataset currently in the provided HollowWriteStateEngine

Parameters:

writeEngine - the write state engine

readEngine - the read state engine

Throws:

java.io.IOException - if the round trip from write to read state failed

roundTripSnapshot

public static void roundTripSnapshot(HollowWriteStateEngine writeEngine,
                                     HollowReadStateEngine readEngine,
                                     HollowFilterConfig filter)
                              throws java.io.IOException

Populate the provided HollowReadStateEngine with the dataset currently in the provided HollowWriteStateEngine.

Apply the provided HollowFilterConfig.

Parameters:

writeEngine - the write state engine

readEngine - the read state engine

filter - the filter configuration

Throws:

java.io.IOException - if the round trip from write to read state failed

roundTripDelta

public static void roundTripDelta(HollowWriteStateEngine writeEngine,
                                  HollowReadStateEngine readEngine)
                           throws java.io.IOException

Update the provided HollowReadStateEngine with the new state currently available in the HollowWriteStateEngine.

It is assumed that the readEngine is currently populated with the prior state from the writeEngine.

Parameters:

writeEngine - the write state engine

readEngine - the read state engine

Throws:

java.io.IOException - if the round trip from write to read state failed