com.netflix.hollow.core.read.engine

Class HollowBlobReader

java.lang.Object

com.netflix.hollow.core.read.engine.HollowBlobReader

public class HollowBlobReader
extends java.lang.Object

A HollowBlobReader is used to populate and update data in a HollowReadStateEngine, via the consumption of snapshot and delta blobs.

Constructor Summary

Constructors

Constructor and Description
HollowBlobReader(HollowReadStateEngine stateEngine)
HollowBlobReader(HollowReadStateEngine stateEngine, HollowBlobHeaderReader headerReader)

Method Summary

Modifier and Type	Method and Description
void	applyDelta(java.io.InputStream is) Update the state engine using a delta (or reverse delta) blob from the provided InputStream.
void	readSnapshot(java.io.InputStream is) Initialize the state engine using a snapshot blob from the provided InputStream.
void	readSnapshot(java.io.InputStream is, HollowFilterConfig filter) Initialize the state engine using a snapshot blob from the provided InputStream.
void	readSnapshot(java.io.InputStream is, TypeFilter filter) Initialize the state engine using a snapshot blob from the provided InputStream.

Methods inherited from class java.lang.Object

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

Constructor Detail

HollowBlobReader

public HollowBlobReader(HollowReadStateEngine stateEngine)

HollowBlobReader

public HollowBlobReader(HollowReadStateEngine stateEngine,
                        HollowBlobHeaderReader headerReader)

Method Detail

readSnapshot

public void readSnapshot(java.io.InputStream is)
                  throws java.io.IOException

Initialize the state engine using a snapshot blob from the provided InputStream.

Parameters:

is - the input stream to read the snapshot from

Throws:

java.io.IOException - if the snapshot could not be read

readSnapshot

public void readSnapshot(java.io.InputStream is,
                         HollowFilterConfig filter)
                  throws java.io.IOException

Initialize the state engine using a snapshot blob from the provided InputStream.

Apply the provided HollowFilterConfig to the state.

Parameters:

is - the input stream to read the snaptshot

filter - the filtering configuration to filter the snapshot

Throws:

java.io.IOException - if the snapshot could not be read

readSnapshot

public void readSnapshot(java.io.InputStream is,
                         TypeFilter filter)
                  throws java.io.IOException

Initialize the state engine using a snapshot blob from the provided InputStream.

Apply the provided TypeFilter to the state.

Parameters:

is - the input stream to read the snaptshot

filter - the type filter to filter the snapshot

Throws:

java.io.IOException - if the snapshot could not be read

applyDelta

public void applyDelta(java.io.InputStream is)
                throws java.io.IOException

Update the state engine using a delta (or reverse delta) blob from the provided InputStream.

If a HollowFilterConfig was applied at the time the HollowReadStateEngine was initialized with a snapshot, it will continue to be in effect after the state is updated.

Parameters:

is - the input stream to read the delta from

Throws:

java.io.IOException - if the delta could not be applied