/*
* 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.nio.ascii.SocketTextReader;
import com.hazelcast.util.Clock;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import static com.hazelcast.util.StringUtil.bytesToString;
final class ReadHandler extends AbstractSelectionHandler implements Runnable {
private final ByteBuffer buffer;
private final IOSelector ioSelector;
private SocketReader socketReader;
private volatile long lastHandle;
public ReadHandler(TcpIpConnection connection, IOSelector ioSelector) {
super(connection);
this.ioSelector = ioSelector;
buffer = ByteBuffer.allocate(connectionManager.socketReceiveBufferSize);
}
public final void handle() {
lastHandle = Clock.currentTimeMillis();
if (!connection.live()) {
String message = "We are being asked to read, but connection is not live so we won't";
logger.finest( message);
systemLogService.logConnection(message);
return;
}
try {
if (socketReader == null) {
initializeSocketReader();
if (socketReader == null) {
// when using SSL, we can read 0 bytes since data read from socket can be handshake packets.
return;
}
}
int readBytes = socketChannel.read(buffer);
if (readBytes == -1) {
throw new EOFException("Remote socket closed!");
}
} catch (Throwable e) {
handleSocketException(e);
return;
}
try {
if (buffer.position() == 0) return;
buffer.flip();
socketReader.read(buffer);
if (buffer.hasRemaining()) {
buffer.compact();
} else {
buffer.clear();
}
} catch (Throwable t) {
handleSocketException(t);
}
}
private void initializeSocketReader() throws IOException {
if (socketReader == null) {
final ByteBuffer protocolBuffer = ByteBuffer.allocate(3);
int readBytes = socketChannel.read(protocolBuffer);
if (readBytes == -1) {
throw new EOFException("Could not read protocol type!");
}
if (readBytes == 0 && connectionManager.isSSLEnabled()) {
// when using SSL, we can read 0 bytes since data read from socket can be handshake packets.
return;
}
if (!protocolBuffer.hasRemaining()) {
String protocol = bytesToString(protocolBuffer.array());
WriteHandler writeHandler = connection.getWriteHandler();
if (Protocols.CLUSTER.equals(protocol)) {
connection.setType(ConnectionType.MEMBER);
writeHandler.setProtocol(Protocols.CLUSTER);
socketReader = new SocketPacketReader(connection);
} else if (Protocols.CLIENT_BINARY.equals(protocol)) {
writeHandler.setProtocol(Protocols.CLIENT_BINARY);
socketReader = new SocketClientDataReader(connection);
} else {
writeHandler.setProtocol(Protocols.TEXT);
buffer.put(protocolBuffer.array());
socketReader = new SocketTextReader(connection);
connection.getConnectionManager().incrementTextConnections();
}
}
if (socketReader == null) {
throw new IOException("Could not initialize SocketReader!");
}
}
}
public final void run() {
registerOp(ioSelector.getSelector(), SelectionKey.OP_READ);
}
long getLastHandle() {
return lastHandle;
}
public void register() {
ioSelector.addTask(this);
ioSelector.wakeup();
}
}