/*
* 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.Bytes;
import net.openhft.chronicle.bytes.RandomDataInput;
import net.openhft.chronicle.hash.AbstractData;
import net.openhft.chronicle.hash.Data;
import net.openhft.chronicle.hash.serialization.DataAccess;
import net.openhft.chronicle.wire.WireIn;
import net.openhft.chronicle.wire.WireOut;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.io.*;
import static net.openhft.chronicle.hash.serialization.impl.DefaultElasticBytes.DEFAULT_BYTES_CAPACITY;
public class SerializableDataAccess<T extends Serializable> extends AbstractData<T>
implements DataAccess<T> {
// Cache fields
transient Bytes bytes;
transient OutputStream out;
transient InputStream in;
/** State field */
transient T instance;
public SerializableDataAccess() {
this(DEFAULT_BYTES_CAPACITY);
}
SerializableDataAccess(long bytesCapacity) {
initTransients(bytesCapacity);
}
void initTransients(long bytesCapacity) {
bytes = DefaultElasticBytes.allocateDefaultElasticBytes(bytesCapacity);
out = bytes.outputStream();
in = bytes.inputStream();
}
@Override
public RandomDataInput bytes() {
return bytes.bytesStore();
}
@Override
public long offset() {
return 0;
}
@Override
public long size() {
return bytes.readRemaining();
}
@Override
public T get() {
return instance;
}
// TODO reuse using object
@Override
public T getUsing(@Nullable T using) {
try {
T result = (T) new ObjectInputStream(in).readObject();
bytes.readPosition(0);
return result;
} catch (IOException | ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
@Override
public Data<T> getData(@NotNull T instance) {
this.instance = instance;
bytes.clear();
try {
ObjectOutputStream out = new ObjectOutputStream(this.out);
out.writeObject(instance);
out.flush();
return this;
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public void uninit() {
instance = null;
}
@Override
public DataAccess<T> copy() {
return new SerializableDataAccess<>(bytes.realCapacity());
}
@Override
public void readMarshallable(@NotNull WireIn wireIn) {
// no fields to read
initTransients(DEFAULT_BYTES_CAPACITY);
}
@Override
public void writeMarshallable(@NotNull WireOut wireOut) {
// no fields to write
}
}