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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.persistence.store.journal;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.apache.tuscany.spi.component.SCAExternalizable;
import org.apache.tuscany.spi.component.WorkContext;
/**
* Utility methods for processing journal records
*
* @version $Rev$ $Date$
*/
public final class SerializationHelper {
private SerializationHelper() {
}
/**
* Serializes and object
*
* @param serializable the object to serialize
* @throws IOException
*/
public static byte[] serialize(Serializable serializable) throws IOException {
ByteArrayOutputStream bas = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(bas);
out.writeObject(serializable);
return bas.toByteArray();
}
/**
* Deserializes an object using the TCCL
*
* @param bytes the serialized object byte array
* @param workContext the current work context
*/
public static Object deserialize(byte[] bytes, WorkContext workContext) throws IOException, ClassNotFoundException {
Object o = new TCCLObjectInputStream(new ByteArrayInputStream(bytes)).readObject();
if (o instanceof SCAExternalizable) {
SCAExternalizable externalizable = (SCAExternalizable) o;
externalizable.setWorkContext(workContext);
externalizable.reactivate();
}
return o;
}
/**
* Breaks a byte array into a series of blocks of the given size
*
* @param bytes the byte array to partition
* @param size the partition size
*/
public static List<byte[]> partition(byte[] bytes, int size) {
assert size > 0;
List<byte[]> list = new ArrayList<byte[]>();
int pos = 0;
while (pos < bytes.length) {
if (pos + size > bytes.length) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
for (int i = pos; i < bytes.length; i++) {
stream.write(bytes[i]);
}
byte[] partition = stream.toByteArray();
list.add(partition);
pos = pos + partition.length;
} else {
byte[] partition = new byte[size];
for (int i = 0; i < size; i++) {
partition[i] = bytes[pos + i];
}
list.add(partition);
pos = pos + size;
}
}
return list;
}
/**
* Creates a serialized header entry that may be written to a log
*
* @param operation the operation type, i.e. {@link Header#INSERT}, {@link Header#UPDATE}, or {@link
* JournalStore#DELETE}
* @param numRecords the number of blocks that the record will be written two excluding the header block
* @param ownerId the id of the owner of the record
* @param id the id of the record unique to the owner
* @param expiration the record expirtation time in milliseconds
* @return a byte array containing the serialized header
* @throws IOException
*/
public static byte[] serializeHeader(short operation, int numRecords, String ownerId, String id, long expiration)
throws IOException {
ByteArrayOutputStream stream = null;
ObjectOutputStream ostream = null;
try {
stream = new ByteArrayOutputStream();
ostream = new ObjectOutputStream(stream);
ostream.writeShort(operation);
ostream.writeInt(numRecords);
ostream.writeObject(ownerId);
ostream.writeObject(id);
ostream.writeLong(expiration);
ostream.flush();
return stream.toByteArray();
} finally {
if (ostream != null) {
try {
ostream.close();
} catch (IOException e) {
// ignore
}
}
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
// ignore
}
}
}
}
/**
* Serializes a unique record id consisting of the owner id and the record's UUID
*
* @param ownerId the id of the owner, typically an SCAObject canonical name
* @param id the id associated with the record
* @return the serialized record byte array
* @throws IOException
*/
public static byte[] serializeRecordId(String ownerId, String id)
throws IOException {
ByteArrayOutputStream stream = null;
ObjectOutputStream ostream = null;
try {
stream = new ByteArrayOutputStream();
ostream = new ObjectOutputStream(stream);
ostream.writeObject(ownerId);
ostream.writeObject(id);
ostream.flush();
return stream.toByteArray();
} finally {
if (ostream != null) {
try {
ostream.close();
} catch (IOException e) {
// ignore
}
}
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
// ignore
}
}
}
}
/**
* Deserializes the given header. The first element from {@link Header#getFields()} is assumed to contain the header
* byte array to deserialize from
*
* @param header the header to deserialize
* @return the deserialized header
* @throws IOException
* @throws ClassNotFoundException
*/
public static Header deserializeHeader(Header header) throws IOException, ClassNotFoundException {
ByteArrayInputStream bas = null;
ObjectInputStream stream = null;
try {
bas = new ByteArrayInputStream(header.getFields()[0]);
stream = new TCCLObjectInputStream(bas);
header.setOperation(stream.readShort());
header.setNumBlocks(stream.readInt());
header.setOwnerId((String) stream.readObject());
header.setId((String) stream.readObject());
header.setExpiration(stream.readLong());
return header;
} finally {
if (bas != null) {
try {
bas.close();
} catch (IOException e) {
// ignore
}
}
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
// ignore
}
}
}
}
}
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