hollow/src/main/java/com/netflix/hollow/core/util/StateEngineRoundTripper.java
public static void roundTripDelta(HollowWriteStateEngine writeEngine, HollowReadStateEngine readEngine) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        HollowBlobWriter writer = new HollowBlobWriter(writeEngine);
        writer.writeDelta(baos);
        HollowBlobReader reader = new HollowBlobReader(readEngine);
        reader.applyDelta(new ByteArrayInputStream(baos.toByteArray()));
        writeEngine.prepareForNextCycle();
    }
public static void roundTripDelta(HollowWriteStateEngine writeEngine, HollowReadStateEngine readEngine) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        HollowBlobWriter writer = new HollowBlobWriter(writeEngine);
        writer.writeDelta(baos);
        HollowBlobReader reader = new HollowBlobReader(readEngine);
        reader.applyDelta(new ByteArrayInputStream(baos.toByteArray()));
        writeEngine.prepareForNextCycle();
    }
public static void roundTripDelta ( HollowWriteStateEngine writeEngine , HollowReadStateEngine readEngine ) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream ( ) ; HollowBlobWriter writer = new HollowBlobWriter ( writeEngine ) ; writer . writeDelta ( baos ) ; HollowBlobReader reader = new HollowBlobReader ( readEngine ) ; reader . applyDelta ( new ByteArrayInputStream ( baos . toByteArray ( ) ) ) ; writeEngine . prepareForNextCycle ( ) ; }
Update the provided {@link HollowReadStateEngine} with the new state currently available in the {@link HollowWriteStateEngine}.
<p>
It is assumed that the readEngine is currently populated with the prior state from the writeEngine.

@param writeEngine the write state engine
@param readEngine the read state engine
@throws IOException if the round trip from write to read state failed
Update the provided { @link HollowReadStateEngine } with the new state currently available in the { @link HollowWriteStateEngine } . <p > It is assumed that the readEngine is currently populated with the prior state from the writeEngine .