package org.jgroups.protocols;
import org.jgroups.Address;
import org.jgroups.Event;
import org.jgroups.PhysicalAddress;
import org.jgroups.annotations.ManagedOperation;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* Loopback transport shared by all channels within the same VM. Property for testing is that no messages are lost. Allows
* us to test various protocols (with ProtocolTester) at maximum speed.
* @author Bela Ban
*/
public class SHARED_LOOPBACK extends TP {
private PhysicalAddress physical_addr=null;
/** Map of cluster names and address-protocol mappings. Used for routing messages to all or single members */
private static final ConcurrentMap<String,Map<Address,SHARED_LOOPBACK>> routing_table=new ConcurrentHashMap<String,Map<Address,SHARED_LOOPBACK>>();
public boolean supportsMulticasting() {
return true; // kind of...
}
public String toString() {
return "SHARED_LOOPBACK(local address: " + local_addr + ')';
}
@ManagedOperation(description="Dumps the contents of the routing table")
public static String dumpRoutingTable() {
StringBuilder sb=new StringBuilder();
for(Map.Entry<String,Map<Address,SHARED_LOOPBACK>> entry: routing_table.entrySet()) {
String cluster_name=entry.getKey();
Set<Address> mbrs=entry.getValue().keySet();
sb.append(cluster_name).append(": ").append(mbrs).append("\n");
}
return sb.toString();
}
public void sendMulticast(byte[] data, int offset, int length) throws Exception {
Map<Address,SHARED_LOOPBACK> dests=routing_table.get(channel_name);
if(dests == null) {
if(log.isTraceEnabled())
log.trace("no destination found for " + channel_name);
return;
}
for(Map.Entry<Address,SHARED_LOOPBACK> entry: dests.entrySet()) {
Address dest=entry.getKey();
SHARED_LOOPBACK target=entry.getValue();
try {
target.receive(local_addr, data, offset, length);
}
catch(Throwable t) {
log.error("failed sending message to " + dest, t);
}
}
}
public void sendUnicast(PhysicalAddress dest, byte[] data, int offset, int length) throws Exception {
Map<Address,SHARED_LOOPBACK> dests=routing_table.get(channel_name);
if(dests == null) {
if(log.isTraceEnabled())
log.trace("no destination found for " + channel_name);
return;
}
SHARED_LOOPBACK target=dests.get(dest);
if(target == null) {
if(log.isTraceEnabled())
log.trace("destination address " + dest + " not found");
return;
}
target.receive(local_addr, data, offset, length);
}
protected void sendToSingleMember(Address dest, byte[] buf, int offset, int length) throws Exception {
Map<Address,SHARED_LOOPBACK> dests=routing_table.get(channel_name);
if(dests == null) {
if(log.isTraceEnabled())
log.trace("no destination found for " + channel_name);
return;
}
SHARED_LOOPBACK target=dests.get(dest);
if(target == null) {
if(log.isTraceEnabled())
log.trace("destination address " + dest + " not found");
return;
}
target.receive(local_addr, buf, offset, length);
}
public String getInfo() {
return toString();
}
protected PhysicalAddress getPhysicalAddress() {
return physical_addr;
}
/*------------------------------ Protocol interface ------------------------------ */
public Object down(Event evt) {
Object retval=super.down(evt);
switch(evt.getType()) {
case Event.CONNECT:
case Event.CONNECT_WITH_STATE_TRANSFER:
case Event.CONNECT_USE_FLUSH:
case Event.CONNECT_WITH_STATE_TRANSFER_USE_FLUSH:
register(channel_name, local_addr, this);
break;
case Event.SET_LOCAL_ADDRESS:
local_addr=(Address)evt.getArg();
break;
}
return retval;
}
public void destroy() {
super.destroy();
// We cannot clear the routing table, as it is shared between channels, and so we would clear the routing for
// a different channel, too !
unregister(channel_name, local_addr);
}
protected static void register(String channel_name, Address local_addr, SHARED_LOOPBACK shared_loopback) {
Map<Address,SHARED_LOOPBACK> map=routing_table.get(channel_name);
if(map == null) {
map=new ConcurrentHashMap<Address,SHARED_LOOPBACK>();
Map<Address,SHARED_LOOPBACK> tmp=routing_table.putIfAbsent(channel_name,map);
if(tmp != null)
map=tmp;
}
map.put(local_addr, shared_loopback);
}
protected static void unregister(String channel_name, Address local_addr) {
Map<Address,SHARED_LOOPBACK> map=routing_table.get(channel_name);
if(map != null) {
map.remove(local_addr);
if(map.isEmpty()) {
routing_table.remove(channel_name);
}
}
}
}