/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.nio;
import com.hazelcast.core.
HazelcastException;
import com.hazelcast.logging.
ILogger;
import com.hazelcast.util.
ExceptionUtil;
import java.nio.
ByteBuffer;
import javax.crypto.
Cipher;
class
SocketPacketWriter implements
SocketWriter<
Packet> {
private final
PacketWriter packetWriter;
final
TcpIpConnection connection;
final
IOService ioService;
final
ILogger logger;
SocketPacketWriter(
TcpIpConnection connection) {
this.
connection =
connection;
this.
ioService =
connection.
getConnectionManager().
ioService;
this.
logger =
ioService.
getLogger(
SocketPacketWriter.class.
getName());
boolean
symmetricEncryptionEnabled =
CipherHelper.
isSymmetricEncryptionEnabled(
ioService);
if (
symmetricEncryptionEnabled) {
packetWriter = new
SymmetricCipherPacketWriter();
logger.
info("Writer started with SymmetricEncryption");
} else {
packetWriter = new
DefaultPacketWriter();
}
}
public boolean
write(
Packet socketWritable,
ByteBuffer socketBuffer) throws
Exception {
return
packetWriter.
writePacket(
socketWritable,
socketBuffer);
}
private interface
PacketWriter {
boolean
writePacket(
Packet packet,
ByteBuffer socketBB) throws
Exception;
}
private static class
DefaultPacketWriter implements
PacketWriter {
public boolean
writePacket(
Packet packet,
ByteBuffer socketBB) {
return
packet.
writeTo(
socketBB);
}
}
private class
SymmetricCipherPacketWriter implements
PacketWriter {
final
Cipher cipher;
ByteBuffer packetBuffer =
ByteBuffer.
allocate(
ioService.
getSocketSendBufferSize() *
IOService.
KILO_BYTE);
boolean
packetWritten = false;
SymmetricCipherPacketWriter() {
cipher =
init();
}
private
Cipher init() {
Cipher c;
try {
c =
CipherHelper.
createSymmetricWriterCipher(
ioService.
getSymmetricEncryptionConfig());
} catch (
Exception e) {
logger.
severe("Symmetric Cipher for WriteHandler cannot be initialized.",
e);
CipherHelper.
handleCipherException(
e,
connection);
throw
ExceptionUtil.
rethrow(
e);
}
return
c;
}
public boolean
writePacket(
Packet packet,
ByteBuffer socketBuffer) throws
Exception {
if (!
packetWritten) {
if (
socketBuffer.
remaining() < 4) {
return false;
}
int
size =
cipher.
getOutputSize(
packet.
size());
socketBuffer.
putInt(
size);
if (
packetBuffer.
capacity() <
packet.
size()) {
packetBuffer =
ByteBuffer.
allocate(
packet.
size());
}
if (!
packet.
writeTo(
packetBuffer)) {
throw new
HazelcastException("Packet didn't fit into the buffer!");
}
packetBuffer.
flip();
packetWritten = true;
}
if (
socketBuffer.
hasRemaining()) {
int
outputSize =
cipher.
getOutputSize(
packetBuffer.
remaining());
if (
outputSize <=
socketBuffer.
remaining()) {
cipher.
update(
packetBuffer,
socketBuffer);
} else {
int
len =
packetBuffer.
remaining() / 2;
while (
len > 0 &&
cipher.
getOutputSize(
len) >
socketBuffer.
remaining()) {
len =
len / 2;
}
if (
len > 0) {
int
limitOld =
packetBuffer.
limit();
packetBuffer.
limit(
packetBuffer.
position() +
len);
cipher.
update(
packetBuffer,
socketBuffer);
packetBuffer.
limit(
limitOld);
}
}
if (!
packetBuffer.
hasRemaining()) {
if (
socketBuffer.
remaining() >=
cipher.
getOutputSize(0)) {
socketBuffer.
put(
cipher.
doFinal());
packetWritten = false;
packetBuffer.
clear();
return true;
}
}
}
return false;
}
}
}