/*
* Copyright (C) 2012, 2016 higherfrequencytrading.com
* Copyright (C) 2016 Roman Leventov
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.openhft.chronicle.hash.serialization.impl;
import net.openhft.chronicle.bytes.*;
import net.openhft.chronicle.hash.Data;
import net.openhft.chronicle.hash.serialization.DataAccess;
import net.openhft.chronicle.hash.serialization.SizedReader;
import net.openhft.chronicle.hash.serialization.SizedWriter;
import net.openhft.chronicle.wire.WireIn;
import net.openhft.chronicle.wire.WireOut;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import static net.openhft.chronicle.hash.serialization.StatefulCopyable.copyIfNeeded;
import static net.openhft.chronicle.hash.serialization.impl.DefaultElasticBytes.DEFAULT_BYTES_CAPACITY;
public class SizedMarshallableDataAccess<T> extends InstanceCreatingMarshaller<T>
implements DataAccess<T>, Data<T> {
// Config fields
private SizedReader<T> sizedReader;
private SizedWriter<? super T> sizedWriter;
// Cache fields
private transient boolean bytesInit;
private transient Bytes bytes;
private transient long size;
private transient VanillaBytes targetBytes;
/** State field */
private transient T instance;
public SizedMarshallableDataAccess(
Class<T> tClass, SizedReader<T> sizedReader, SizedWriter<? super T> sizedWriter) {
this(tClass, sizedReader, sizedWriter, DEFAULT_BYTES_CAPACITY);
}
private SizedMarshallableDataAccess(
Class<T> tClass, SizedReader<T> sizedReader, SizedWriter<? super T> sizedWriter,
long bytesCapacity) {
super(tClass);
this.sizedWriter = sizedWriter;
this.sizedReader = sizedReader;
initTransients(bytesCapacity);
}
SizedReader<T> sizedReader() {
return sizedReader;
}
SizedWriter<? super T> sizedWriter() {
return sizedWriter;
}
private void initTransients(long bytesCapacity) {
bytes = DefaultElasticBytes.allocateDefaultElasticBytes(bytesCapacity);
targetBytes = VanillaBytes.vanillaBytes();
}
@Override
public RandomDataInput bytes() {
if (!bytesInit) {
bytes.clear();
sizedWriter.write(bytes, size, instance);
bytesInit = true;
}
return bytes.bytesStore();
}
@Override
public long offset() {
return 0;
}
@Override
public long size() {
return size;
}
@Override
public void writeTo(RandomDataOutput target, long targetOffset) {
if (bytesInit || !(target instanceof BytesStore)) {
target.write(targetOffset, bytes(), offset(), size);
} else {
targetBytes.bytesStore((BytesStore) target, targetOffset, size);
targetBytes.writePosition(targetOffset);
sizedWriter.write(targetBytes, size, instance);
targetBytes.bytesStore(NoBytesStore.NO_BYTES_STORE, 0, 0);
}
}
@Override
public T get() {
return instance;
}
@Override
public T getUsing(@Nullable T using) {
if (using == null)
using = createInstance();
T result = sizedReader.read(bytes, size(), using);
bytes.readPosition(0);
return result;
}
@Override
public int hashCode() {
return dataHashCode();
}
@Override
public boolean equals(Object obj) {
return dataEquals(obj);
}
@Override
public String toString() {
return get().toString();
}
@Override
public Data<T> getData(@NotNull T instance) {
this.instance = instance;
this.size = sizedWriter.size(instance);
bytesInit = false;
return this;
}
@Override
public void uninit() {
instance = null;
}
@Override
public DataAccess<T> copy() {
return new SizedMarshallableDataAccess<>(
tClass(), copyIfNeeded(sizedReader), copyIfNeeded(sizedWriter),
bytes.realCapacity());
}
@Override
public void readMarshallable(@NotNull WireIn wireIn) {
super.readMarshallable(wireIn);
sizedReader = wireIn.read(() -> "sizedReader").typedMarshallable();
sizedWriter = wireIn.read(() -> "sizedWriter").typedMarshallable();
initTransients(DEFAULT_BYTES_CAPACITY);
}
@Override
public void writeMarshallable(@NotNull WireOut wireOut) {
super.writeMarshallable(wireOut);
wireOut.write(() -> "sizedReader").typedMarshallable(sizedReader);
wireOut.write(() -> "sizedWriter").typedMarshallable(sizedWriter);
}
}