ChannelData.java
/*
* 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.catalina.tribes.io;
import java.sql.Timestamp;
import java.util.Arrays;
import org.apache.catalina.tribes.Channel;
import org.apache.catalina.tribes.ChannelMessage;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.membership.MemberImpl;
import org.apache.catalina.tribes.util.UUIDGenerator;
/**
* The <code>ChannelData</code> object is used to transfer a message through the
* channel interceptor stack and eventually out on a transport to be sent
* to another node. While the message is being processed by the different
* interceptors, the message data can be manipulated as each interceptor seems appropriate.
* @author Peter Rossbach
*/
public class ChannelData implements ChannelMessage {
private static final long serialVersionUID = 1L;
public static final ChannelData[] EMPTY_DATA_ARRAY = new ChannelData[0];
public static volatile boolean USE_SECURE_RANDOM_FOR_UUID = false;
/**
* The options this message was sent with
*/
private int options = 0 ;
/**
* The message data, stored in a dynamic buffer
*/
private XByteBuffer message ;
/**
* The timestamp that goes with this message
*/
private long timestamp ;
/**
* A unique message id
*/
private byte[] uniqueId ;
/**
* The source or reply-to address for this message
*/
private Member address;
/**
* Creates an empty channel data with a new unique Id
* @see #ChannelData(boolean)
*/
public ChannelData() {
this(true);
}
/**
* Create an empty channel data object
* @param generateUUID boolean - if true, a unique Id will be generated
*/
public ChannelData(boolean generateUUID) {
if ( generateUUID ) {
generateUUID();
}
}
/**
* Creates a new channel data object with data
* @param uniqueId - unique message id
* @param message - message data
* @param timestamp - message timestamp
*/
public ChannelData(byte[] uniqueId, XByteBuffer message, long timestamp) {
this.uniqueId = uniqueId;
this.message = message;
this.timestamp = timestamp;
}
@Override
public XByteBuffer getMessage() {
return message;
}
@Override
public void setMessage(XByteBuffer message) {
this.message = message;
}
@Override
public long getTimestamp() {
return timestamp;
}
@Override
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
}
@Override
public byte[] getUniqueId() {
return uniqueId;
}
public void setUniqueId(byte[] uniqueId) {
this.uniqueId = uniqueId;
}
@Override
public int getOptions() {
return options;
}
@Override
public void setOptions(int options) {
this.options = options;
}
@Override
public Member getAddress() {
return address;
}
@Override
public void setAddress(Member address) {
this.address = address;
}
/**
* Generates a UUID and invokes setUniqueId
*/
public void generateUUID() {
byte[] data = new byte[16];
UUIDGenerator.randomUUID(USE_SECURE_RANDOM_FOR_UUID,data,0);
setUniqueId(data);
}
public int getDataPackageLength() {
int length =
4 + //options
8 + //timestamp off=4
4 + //unique id length off=12
uniqueId.length+ //id data off=12+uniqueId.length
4 + //addr length off=12+uniqueId.length+4
address.getDataLength()+ //member data off=12+uniqueId.length+4+add.length
4 + //message length off=12+uniqueId.length+4+add.length+4
message.getLength();
return length;
}
/**
* Serializes the ChannelData object into a byte[] array
* @return byte[]
*/
public byte[] getDataPackage() {
int length = getDataPackageLength();
byte[] data = new byte[length];
int offset = 0;
return getDataPackage(data,offset);
}
public byte[] getDataPackage(byte[] data, int offset) {
byte[] addr = address.getData(false);
XByteBuffer.toBytes(options,data,offset);
offset += 4; //options
XByteBuffer.toBytes(timestamp,data,offset);
offset += 8; //timestamp
XByteBuffer.toBytes(uniqueId.length,data,offset);
offset += 4; //uniqueId.length
System.arraycopy(uniqueId,0,data,offset,uniqueId.length);
offset += uniqueId.length; //uniqueId data
XByteBuffer.toBytes(addr.length,data,offset);
offset += 4; //addr.length
System.arraycopy(addr,0,data,offset,addr.length);
offset += addr.length; //addr data
XByteBuffer.toBytes(message.getLength(),data,offset);
offset += 4; //message.length
System.arraycopy(message.getBytesDirect(),0,data,offset,message.getLength());
return data;
}
/**
* Deserializes a ChannelData object from a byte array
* @param xbuf byte[]
* @return ChannelData
*/
public static ChannelData getDataFromPackage(XByteBuffer xbuf) {
ChannelData data = new ChannelData(false);
int offset = 0;
data.setOptions(XByteBuffer.toInt(xbuf.getBytesDirect(),offset));
offset += 4; //options
data.setTimestamp(XByteBuffer.toLong(xbuf.getBytesDirect(),offset));
offset += 8; //timestamp
data.uniqueId = new byte[XByteBuffer.toInt(xbuf.getBytesDirect(),offset)];
offset += 4; //uniqueId length
System.arraycopy(xbuf.getBytesDirect(),offset,data.uniqueId,0,data.uniqueId.length);
offset += data.uniqueId.length; //uniqueId data
//byte[] addr = new byte[XByteBuffer.toInt(xbuf.getBytesDirect(),offset)];
int addrlen = XByteBuffer.toInt(xbuf.getBytesDirect(),offset);
offset += 4; //addr length
//System.arraycopy(xbuf.getBytesDirect(),offset,addr,0,addr.length);
data.setAddress(MemberImpl.getMember(xbuf.getBytesDirect(),offset,addrlen));
//offset += addr.length; //addr data
offset += addrlen;
int xsize = XByteBuffer.toInt(xbuf.getBytesDirect(),offset);
offset += 4; //xsize length
System.arraycopy(xbuf.getBytesDirect(),offset,xbuf.getBytesDirect(),0,xsize);
xbuf.setLength(xsize);
data.message = xbuf;
return data;
}
public static ChannelData getDataFromPackage(byte[] b) {
ChannelData data = new ChannelData(false);
int offset = 0;
data.setOptions(XByteBuffer.toInt(b,offset));
offset += 4; //options
data.setTimestamp(XByteBuffer.toLong(b,offset));
offset += 8; //timestamp
data.uniqueId = new byte[XByteBuffer.toInt(b,offset)];
offset += 4; //uniqueId length
System.arraycopy(b,offset,data.uniqueId,0,data.uniqueId.length);
offset += data.uniqueId.length; //uniqueId data
byte[] addr = new byte[XByteBuffer.toInt(b,offset)];
offset += 4; //addr length
System.arraycopy(b,offset,addr,0,addr.length);
data.setAddress(MemberImpl.getMember(addr));
offset += addr.length; //addr data
int xsize = XByteBuffer.toInt(b,offset);
//data.message = new XByteBuffer(new byte[xsize],false);
data.message = BufferPool.getBufferPool().getBuffer(xsize,false);
offset += 4; //message length
System.arraycopy(b,offset,data.message.getBytesDirect(),0,xsize);
data.message.append(b,offset,xsize);
offset += xsize; //message data
return data;
}
@Override
public int hashCode() {
return XByteBuffer.toInt(getUniqueId(),0);
}
/**
* Compares to ChannelData objects, only compares on getUniqueId().equals(o.getUniqueId())
* @param o Object
* @return boolean
*/
@Override
public boolean equals(Object o) {
if ( o instanceof ChannelData ) {
return Arrays.equals(getUniqueId(),((ChannelData)o).getUniqueId());
} else {
return false;
}
}
/**
* Create a shallow clone, only the data gets recreated
* @return ClusterData
*/
@Override
public ChannelData clone() {
ChannelData clone;
try {
clone = (ChannelData) super.clone();
} catch (CloneNotSupportedException e) {
// Cannot happen
throw new AssertionError();
}
if (this.message != null) {
clone.message = new XByteBuffer(this.message.getBytesDirect(),false);
}
return clone;
}
@Override
public Object deepclone() {
byte[] d = this.getDataPackage();
return getDataFromPackage(d);
}
/**
* Utility method, returns true if the options flag indicates that an ack
* is to be sent after the message has been received and processed
* @param options int - the options for the message
* @return boolean
* @see org.apache.catalina.tribes.Channel#SEND_OPTIONS_USE_ACK
* @see org.apache.catalina.tribes.Channel#SEND_OPTIONS_SYNCHRONIZED_ACK
*/
public static boolean sendAckSync(int options) {
return ( (Channel.SEND_OPTIONS_USE_ACK & options) == Channel.SEND_OPTIONS_USE_ACK) &&
( (Channel.SEND_OPTIONS_SYNCHRONIZED_ACK & options) == Channel.SEND_OPTIONS_SYNCHRONIZED_ACK);
}
/**
* Utility method, returns true if the options flag indicates that an ack
* is to be sent after the message has been received but not yet processed
* @param options int - the options for the message
* @return boolean
* @see org.apache.catalina.tribes.Channel#SEND_OPTIONS_USE_ACK
* @see org.apache.catalina.tribes.Channel#SEND_OPTIONS_SYNCHRONIZED_ACK
*/
public static boolean sendAckAsync(int options) {
return ( (Channel.SEND_OPTIONS_USE_ACK & options) == Channel.SEND_OPTIONS_USE_ACK) &&
( (Channel.SEND_OPTIONS_SYNCHRONIZED_ACK & options) != Channel.SEND_OPTIONS_SYNCHRONIZED_ACK);
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append("ClusterData[src=");
buf.append(getAddress()).append("; id=");
buf.append(bToS(getUniqueId())).append("; sent=");
buf.append(new Timestamp(this.getTimestamp()).toString()).append(']');
return buf.toString();
}
public static String bToS(byte[] data) {
StringBuilder buf = new StringBuilder(4*16);
buf.append('{');
for (int i=0; data!=null && i<data.length; i++ ) {
buf.append(String.valueOf(data[i])).append(' ');
}
buf.append('}');
return buf.toString();
}
}