Tomcat example source code file (MemberImpl.java)
The Tomcat MemberImpl.java source code/*
* 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.membership;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Arrays;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.io.XByteBuffer;
import org.apache.catalina.tribes.transport.SenderState;
/**
* A <b>membership implementation using simple multicast.
* This is the representation of a multicast member.
* Carries the host, and port of the this or other cluster nodes.
*
* @author Filip Hanik
* @version $Revision: 613209 $, $Date: 2008-01-18 18:29:08 +0100 (ven., 18 janv. 2008) $
*/
public class MemberImpl implements Member, java.io.Externalizable {
/**
* Should a call to getName or getHostName try to do a DNS lookup?
* default is false
*/
public static final boolean DO_DNS_LOOKUPS = Boolean.parseBoolean(System.getProperty("org.apache.catalina.tribes.dns_lookups","false"));
/**
* Public properties specific to this implementation
*/
public static final transient String TCP_LISTEN_PORT = "tcpListenPort";
public static final transient String TCP_LISTEN_HOST = "tcpListenHost";
public static final transient String MEMBER_NAME = "memberName";
public static final transient byte[] TRIBES_MBR_BEGIN = new byte[] {84, 82, 73, 66, 69, 83, 45, 66};
public static final transient byte[] TRIBES_MBR_END = new byte[] {84, 82, 73, 66, 69, 83, 45, 69};
/**
* The listen host for this member
*/
protected byte[] host;
protected transient String hostname;
/**
* The tcp listen port for this member
*/
protected int port;
/**
* The tcp/SSL listen port for this member
*/
protected int securePort = -1;
/**
* Counter for how many broadcast messages have been sent from this member
*/
protected int msgCount = 0;
/**
* The number of milliseconds since this members was
* created, is kept track of using the start time
*/
protected long memberAliveTime = 0;
/**
* For the local member only
*/
protected transient long serviceStartTime;
/**
* To avoid serialization over and over again, once the local dataPkg
* has been set, we use that to transmit data
*/
protected transient byte[] dataPkg = null;
/**
* Unique session Id for this member
*/
protected byte[] uniqueId = new byte[16];
/**
* Custom payload that an app framework can broadcast
* Also used to transport stop command.
*/
protected byte[] payload = new byte[0];
/**
* Command, so that the custom payload doesn't have to be used
* This is for internal tribes use, such as SHUTDOWN_COMMAND
*/
protected byte[] command = new byte[0];
/**
* Domain if we want to filter based on domain.
*/
protected byte[] domain = new byte[0];
/**
* Empty constructor for serialization
*/
public MemberImpl() {
}
/**
* Construct a new member object
* @param name - the name of this member, cluster unique
* @param domain - the cluster domain name of this member
* @param host - the tcp listen host
* @param port - the tcp listen port
*/
public MemberImpl(String host,
int port,
long aliveTime) throws IOException {
setHostname(host);
this.port = port;
this.memberAliveTime=aliveTime;
}
public MemberImpl(String host,
int port,
long aliveTime,
byte[] payload) throws IOException {
this(host,port,aliveTime);
setPayload(payload);
}
public boolean isReady() {
return SenderState.getSenderState(this).isReady();
}
public boolean isSuspect() {
return SenderState.getSenderState(this).isSuspect();
}
public boolean isFailing() {
return SenderState.getSenderState(this).isFailing();
}
/**
* Increment the message count.
*/
protected void inc() {
msgCount++;
}
/**
* Create a data package to send over the wire representing this member.
* This is faster than serialization.
* @return - the bytes for this member deserialized
* @throws Exception
*/
public byte[] getData() {
return getData(true);
}
/**
* Highly optimized version of serializing a member into a byte array
* Returns a cached byte[] reference, do not modify this data
* @param getalive boolean
* @return byte[]
*/
public byte[] getData(boolean getalive) {
return getData(getalive,false);
}
public int getDataLength() {
return TRIBES_MBR_BEGIN.length+ //start pkg
4+ //data length
8+ //alive time
4+ //port
4+ //secure port
1+ //host length
host.length+ //host
4+ //command length
command.length+ //command
4+ //domain length
domain.length+ //domain
16+ //unique id
4+ //payload length
payload.length+ //payload
TRIBES_MBR_END.length; //end pkg
}
/**
*
* @param getalive boolean - calculate memberAlive time
* @param reset boolean - reset the cached data package, and create a new one
* @return byte[]
*/
public byte[] getData(boolean getalive, boolean reset) {
if ( reset ) dataPkg = null;
//look in cache first
if ( dataPkg!=null ) {
if ( getalive ) {
//you'd be surprised, but System.currentTimeMillis
//shows up on the profiler
long alive=System.currentTimeMillis()-getServiceStartTime();
XByteBuffer.toBytes( (long) alive, dataPkg, TRIBES_MBR_BEGIN.length+4);
}
return dataPkg;
}
//package looks like
//start package TRIBES_MBR_BEGIN.length
//package length - 4 bytes
//alive - 8 bytes
//port - 4 bytes
//secure port - 4 bytes
//host length - 1 byte
//host - hl bytes
//clen - 4 bytes
//command - clen bytes
//dlen - 4 bytes
//domain - dlen bytes
//uniqueId - 16 bytes
//payload length - 4 bytes
//payload plen bytes
//end package TRIBES_MBR_END.length
byte[] addr = host;
long alive=System.currentTimeMillis()-getServiceStartTime();
byte hl = (byte)addr.length;
byte[] data = new byte[getDataLength()];
int bodylength = (getDataLength() - TRIBES_MBR_BEGIN.length - TRIBES_MBR_END.length - 4);
int pos = 0;
//TRIBES_MBR_BEGIN
System.arraycopy(TRIBES_MBR_BEGIN,0,data,pos,TRIBES_MBR_BEGIN.length);
pos += TRIBES_MBR_BEGIN.length;
//body length
XByteBuffer.toBytes(bodylength,data,pos);
pos += 4;
//alive data
XByteBuffer.toBytes((long)alive,data,pos);
pos += 8;
//port
XByteBuffer.toBytes(port,data,pos);
pos += 4;
//secure port
XByteBuffer.toBytes(securePort,data,pos);
pos += 4;
//host length
data[pos++] = hl;
//host
System.arraycopy(addr,0,data,pos,addr.length);
pos+=addr.length;
//clen - 4 bytes
XByteBuffer.toBytes(command.length,data,pos);
pos+=4;
//command - clen bytes
System.arraycopy(command,0,data,pos,command.length);
pos+=command.length;
//dlen - 4 bytes
XByteBuffer.toBytes(domain.length,data,pos);
pos+=4;
//domain - dlen bytes
System.arraycopy(domain,0,data,pos,domain.length);
pos+=domain.length;
//unique Id
System.arraycopy(uniqueId,0,data,pos,uniqueId.length);
pos+=uniqueId.length;
//payload
XByteBuffer.toBytes(payload.length,data,pos);
pos+=4;
System.arraycopy(payload,0,data,pos,payload.length);
pos+=payload.length;
//TRIBES_MBR_END
System.arraycopy(TRIBES_MBR_END,0,data,pos,TRIBES_MBR_END.length);
pos += TRIBES_MBR_END.length;
//create local data
dataPkg = data;
return data;
}
/**
* Deserializes a member from data sent over the wire
* @param data - the bytes received
* @return a member object.
*/
public static MemberImpl getMember(byte[] data, MemberImpl member) {
return getMember(data,0,data.length,member);
}
public static MemberImpl getMember(byte[] data, int offset, int length, MemberImpl member) {
//package looks like
//start package TRIBES_MBR_BEGIN.length
//package length - 4 bytes
//alive - 8 bytes
//port - 4 bytes
//secure port - 4 bytes
//host length - 1 byte
//host - hl bytes
//clen - 4 bytes
//command - clen bytes
//dlen - 4 bytes
//domain - dlen bytes
//uniqueId - 16 bytes
//payload length - 4 bytes
//payload plen bytes
//end package TRIBES_MBR_END.length
int pos = offset;
if (XByteBuffer.firstIndexOf(data,offset,TRIBES_MBR_BEGIN)!=pos) {
throw new IllegalArgumentException("Invalid package, should start with:"+org.apache.catalina.tribes.util.Arrays.toString(TRIBES_MBR_BEGIN));
}
if ( length < (TRIBES_MBR_BEGIN.length+4) ) {
throw new ArrayIndexOutOfBoundsException("Member package to small to validate.");
}
pos += TRIBES_MBR_BEGIN.length;
int bodylength = XByteBuffer.toInt(data,pos);
pos += 4;
if ( length < (bodylength+4+TRIBES_MBR_BEGIN.length+TRIBES_MBR_END.length) ) {
throw new ArrayIndexOutOfBoundsException("Not enough bytes in member package.");
}
int endpos = pos+bodylength;
if (XByteBuffer.firstIndexOf(data,endpos,TRIBES_MBR_END)!=endpos) {
throw new IllegalArgumentException("Invalid package, should end with:"+org.apache.catalina.tribes.util.Arrays.toString(TRIBES_MBR_END));
}
byte[] alived = new byte[8];
System.arraycopy(data, pos, alived, 0, 8);
pos += 8;
byte[] portd = new byte[4];
System.arraycopy(data, pos, portd, 0, 4);
pos += 4;
byte[] sportd = new byte[4];
System.arraycopy(data, pos, sportd, 0, 4);
pos += 4;
byte hl = data[pos++];
byte[] addr = new byte[hl];
System.arraycopy(data, pos, addr, 0, hl);
pos += hl;
int cl = XByteBuffer.toInt(data, pos);
pos += 4;
byte[] command = new byte[cl];
System.arraycopy(data, pos, command, 0, command.length);
pos += command.length;
int dl = XByteBuffer.toInt(data, pos);
pos += 4;
byte[] domain = new byte[dl];
System.arraycopy(data, pos, domain, 0, domain.length);
pos += domain.length;
byte[] uniqueId = new byte[16];
System.arraycopy(data, pos, uniqueId, 0, 16);
pos += 16;
int pl = XByteBuffer.toInt(data, pos);
pos += 4;
byte[] payload = new byte[pl];
System.arraycopy(data, pos, payload, 0, payload.length);
pos += payload.length;
member.setHost(addr);
member.setPort(XByteBuffer.toInt(portd, 0));
member.setSecurePort(XByteBuffer.toInt(sportd, 0));
member.setMemberAliveTime(XByteBuffer.toLong(alived, 0));
member.setUniqueId(uniqueId);
member.payload = payload;
member.domain = domain;
member.command = command;
member.dataPkg = new byte[length];
System.arraycopy(data, offset, member.dataPkg, 0, length);
return member;
}
public static MemberImpl getMember(byte[] data) {
return getMember(data,new MemberImpl());
}
public static MemberImpl getMember(byte[] data, int offset, int length) {
return getMember(data,offset,length,new MemberImpl());
}
/**
* Return the name of this object
* @return a unique name to the cluster
*/
public String getName() {
return "tcp://"+getHostname()+":"+getPort();
}
/**
* Return the listen port of this member
* @return - tcp listen port
*/
public int getPort() {
return this.port;
}
/**
* Return the TCP listen host for this member
* @return IP address or host name
*/
public byte[] getHost() {
return host;
}
public String getHostname() {
if ( this.hostname != null ) return hostname;
else {
try {
if (DO_DNS_LOOKUPS)
this.hostname = java.net.InetAddress.getByAddress(host).getHostName();
else
this.hostname = org.apache.catalina.tribes.util.Arrays.toString(host);
return this.hostname;
}catch ( IOException x ) {
throw new RuntimeException("Unable to parse hostname.",x);
}
}
}
/**
* Contains information on how long this member has been online.
* The result is the number of milli seconds this member has been
* broadcasting its membership to the cluster.
* @return nr of milliseconds since this member started.
*/
public long getMemberAliveTime() {
return memberAliveTime;
}
public long getServiceStartTime() {
return serviceStartTime;
}
public byte[] getUniqueId() {
return uniqueId;
}
public byte[] getPayload() {
return payload;
}
public byte[] getCommand() {
return command;
}
public byte[] getDomain() {
return domain;
}
public int getSecurePort() {
return securePort;
}
public void setMemberAliveTime(long time) {
memberAliveTime=time;
}
/**
* String representation of this object
*/
public String toString() {
StringBuffer buf = new StringBuffer("org.apache.catalina.tribes.membership.MemberImpl[");
buf.append(getName()).append(",");
buf.append(getHostname()).append(",");
buf.append(port).append(", alive=");
buf.append(memberAliveTime).append(",");
buf.append("id=").append(bToS(this.uniqueId)).append(", ");
buf.append("payload=").append(bToS(this.payload,8)).append(", ");
buf.append("command=").append(bToS(this.command,8)).append(", ");
buf.append("domain=").append(bToS(this.domain,8)).append(", ");
buf.append("]");
return buf.toString();
}
public static String bToS(byte[] data) {
return bToS(data,data.length);
}
public static String bToS(byte[] data, int max) {
StringBuffer buf = new StringBuffer(4*16);
buf.append("{");
for (int i=0; data!=null && i<data.length; i++ ) {
buf.append(String.valueOf(data[i])).append(" ");
if ( i==max ) {
buf.append("...("+data.length+")");
break;
}
}
buf.append("}");
return buf.toString();
}
/**
* @see java.lang.Object#hashCode()
* @return The hash code
*/
public int hashCode() {
return getHost()[0]+getHost()[1]+getHost()[2]+getHost()[3];
}
/**
* Returns true if the param o is a McastMember with the same name
* @param o
*/
public boolean equals(Object o) {
if ( o instanceof MemberImpl ) {
return Arrays.equals(this.getHost(),((MemberImpl)o).getHost()) &&
this.getPort() == ((MemberImpl)o).getPort() &&
Arrays.equals(this.getUniqueId(),((MemberImpl)o).getUniqueId());
}
else
return false;
}
public void setHost(byte[] host) {
this.host = host;
}
public void setHostname(String host) throws IOException {
hostname = host;
this.host = java.net.InetAddress.getByName(host).getAddress();
}
public void setMsgCount(int msgCount) {
this.msgCount = msgCount;
}
public void setPort(int port) {
this.port = port;
this.dataPkg = null;
}
public void setServiceStartTime(long serviceStartTime) {
this.serviceStartTime = serviceStartTime;
}
public void setUniqueId(byte[] uniqueId) {
this.uniqueId = uniqueId!=null?uniqueId:new byte[16];
getData(true,true);
}
public void setPayload(byte[] payload) {
byte[] oldpayload = this.payload;
this.payload = payload!=null?payload:new byte[0];
if ( this.getData(true,true).length > McastServiceImpl.MAX_PACKET_SIZE ) {
this.payload = oldpayload;
throw new IllegalArgumentException("Payload is to large for tribes to handle.");
}
}
public void setCommand(byte[] command) {
this.command = command!=null?command:new byte[0];
getData(true,true);
}
public void setDomain(byte[] domain) {
this.domain = domain!=null?domain:new byte[0];
getData(true,true);
}
public void setSecurePort(int securePort) {
this.securePort = securePort;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
int length = in.readInt();
byte[] message = new byte[length];
in.read(message);
getMember(message,this);
}
public void writeExternal(ObjectOutput out) throws IOException {
byte[] data = this.getData();
out.writeInt(data.length);
out.write(data);
}
}
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