/** Sends a GET_MBR_REQ to *all* GossipRouters, merges responses. */
private List _getMembers(String group) {
List ret = new LinkedList();
Socket sock = null;
SocketAddress destAddr;
DataOutputStream out = null;
DataInputStream in = null;
IpAddress entry;
GossipData gossip_req, gossip_rsp;
Address mbr;
for (int i = 0; i < gossip_servers.size(); i++) {
entry = (IpAddress) gossip_servers.elementAt(i);
if (entry.getIpAddress() == null || entry.getPort() == 0) {
if (log.isErrorEnabled()) log.error("entry.host or entry.port is null");
continue;
}
try {
// sock=new Socket(entry.getIpAddress(), entry.getPort());
sock = new Socket();
destAddr = new InetSocketAddress(entry.getIpAddress(), entry.getPort());
sock.connect(destAddr, SOCKET_TIMEOUT);
out = new DataOutputStream(sock.getOutputStream());
gossip_req = new GossipData(GossipRouter.GOSSIP_GET, group, null, null);
// must send GossipData as fast as possible, otherwise the
// request might be rejected
gossip_req.writeTo(out);
out.flush();
in = new DataInputStream(sock.getInputStream());
gossip_rsp = new GossipData();
gossip_rsp.readFrom(in);
if (gossip_rsp.mbrs != null) { // merge with ret
for (Iterator it = gossip_rsp.mbrs.iterator(); it.hasNext(); ) {
mbr = (Address) it.next();
if (!ret.contains(mbr)) ret.add(mbr);
}
}
} catch (Exception ex) {
if (log.isErrorEnabled()) log.error("exception connecting to host " + entry);
} finally {
Util.close(out);
Util.close(in);
if (sock != null) {
try {
sock.close();
} catch (IOException e) {
}
}
}
}
return ret;
}
void _unregister(String group, Address mbr) {
Socket sock = null;
DataOutputStream out = null;
IpAddress entry;
GossipData gossip_req;
for (int i = 0; i < gossip_servers.size(); i++) {
entry = (IpAddress) gossip_servers.elementAt(i);
if (entry.getIpAddress() == null || entry.getPort() == 0) {
if (log.isErrorEnabled()) log.error("entry.host or entry.port is null");
continue;
}
try {
if (log.isTraceEnabled())
log.trace(
"UNREGISTER("
+ group
+ ", "
+ mbr
+ ") with GossipRouter at "
+ entry.getIpAddress()
+ ':'
+ entry.getPort());
sock = new Socket(entry.getIpAddress(), entry.getPort());
out = new DataOutputStream(sock.getOutputStream());
gossip_req = new GossipData(GossipRouter.UNREGISTER, group, mbr, null);
// must send GossipData as fast as possible, otherwise the
// request might be rejected
gossip_req.writeTo(out);
out.flush();
} catch (Exception ex) {
if (log.isErrorEnabled()) log.error("exception connecting to host " + entry);
} finally {
Util.close(out);
if (sock != null) {
try {
sock.close();
} catch (IOException e) {
}
}
}
}
}