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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef SocketClientRegistry_H
#define SocketClientRegistry_H
#include <NdbTCP.h>
#include <NdbOut.hpp>
#include "SocketClient.hpp"
template<class T>
class SocketRegistry {
public:
SocketRegistry(Uint32 maxSocketClients);
~SocketRegistry();
/**
* creates and adds a SocketClient to m_socketClients[]
* @param host - host name
* @param port - port to connect to
*/
bool createSocketClient(const char * host, const Uint16 port);
/**
* performReceive reads from sockets should do more stuff
*/
int performReceive(T &);
/**
* performReceive reads from sockets should do more stuff
*/
int syncPerformReceive(const char* ,T &, Uint32);
/**
* performSend sends a command to a host
*/
bool performSend(const char * buf, Uint32 len, const char * remotehost);
/**
* pollSocketClients performs a select (for a max. of timeoutmillis) or
* until there is data to be read from any SocketClient
* @param timeOutMillis - select timeout
*/
int pollSocketClients(Uint32 timeOutMillis);
/**
* reconnect tries to reconnect to a cpcd given its hostname
* @param host - name of host to reconnect to.
*/
bool reconnect(const char * host);
/**
* removeSocketClient
* @param host - name of host for which to remove the SocketConnection
*/
bool removeSocketClient(const char * host);
private:
SocketClient** m_socketClients;
Uint32 m_maxSocketClients;
Uint32 m_nSocketClients;
int tcpReadSelectReply;
fd_set tcpReadset;
};
template<class T>
inline
SocketRegistry<T>::SocketRegistry(Uint32 maxSocketClients) {
m_maxSocketClients = maxSocketClients;
m_socketClients = new SocketClient * [m_maxSocketClients];
m_nSocketClients = 0;
}
template<class T>
inline
SocketRegistry<T>::~SocketRegistry() {
delete [] m_socketClients;
}
template<class T>
inline
bool
SocketRegistry<T>::createSocketClient(const char * host, Uint16 port) {
if(port == 0)
return false;
if(host==NULL)
return false;
SocketClient * socketClient = new SocketClient(host, port);
if(socketClient->openSocket() < 0 || socketClient == NULL) {
ndbout << "could not connect" << endl;
delete socketClient;
return false;
}
else {
m_socketClients[m_nSocketClients] = socketClient;
m_nSocketClients++;
}
return true;
}
template<class T>
inline
int
SocketRegistry<T>::pollSocketClients(Uint32 timeOutMillis) {
// Return directly if there are no TCP transporters configured
if (m_nSocketClients == 0){
tcpReadSelectReply = 0;
return 0;
}
struct timeval timeout;
timeout.tv_sec = timeOutMillis / 1000;
timeout.tv_usec = (timeOutMillis % 1000) * 1000;
NDB_SOCKET_TYPE maxSocketValue = 0;
// Needed for TCP/IP connections
// The read- and writeset are used by select
FD_ZERO(&tcpReadset);
// Prepare for sending and receiving
for (Uint32 i = 0; i < m_nSocketClients; i++) {
SocketClient * t = m_socketClients[i];
// If the socketclient is connected
if (t->isConnected()) {
const NDB_SOCKET_TYPE socket = t->getSocket();
// Find the highest socket value. It will be used by select
if (socket > maxSocketValue)
maxSocketValue = socket;
// Put the connected transporters in the socket read-set
FD_SET(socket, &tcpReadset);
}
}
// The highest socket value plus one
maxSocketValue++;
tcpReadSelectReply = select(maxSocketValue, &tcpReadset, 0, 0, &timeout);
#ifdef NDB_WIN32
if(tcpReadSelectReply == SOCKET_ERROR)
{
NdbSleep_MilliSleep(timeOutMillis);
}
#endif
return tcpReadSelectReply;
}
template<class T>
inline
bool
SocketRegistry<T>::performSend(const char * buf, Uint32 len, const char * remotehost)
{
SocketClient * socketClient;
for(Uint32 i=0; i < m_nSocketClients; i++) {
socketClient = m_socketClients[i];
if(strcmp(socketClient->gethostname(), remotehost)==0) {
if(socketClient->isConnected()) {
if(socketClient->writeSocket(buf, len)>0)
return true;
else
return false;
}
}
}
return false;
}
template<class T>
inline
int
SocketRegistry<T>::performReceive(T & t) {
char buf[255] ; //temp. just for testing. must fix better
if(tcpReadSelectReply > 0){
for (Uint32 i=0; i<m_nSocketClients; i++) {
SocketClient *sc = m_socketClients[i];
const NDB_SOCKET_TYPE socket = sc->getSocket();
if(sc->isConnected() && FD_ISSET(socket, &tcpReadset)) {
t->runSession(socket,t);
}
}
return 1;
}
return 0;
}
template<class T>
inline
int
SocketRegistry<T>::syncPerformReceive(const char * remotehost,
T & t,
Uint32 timeOutMillis) {
char buf[255] ; //temp. just for testing. must fix better
struct timeval timeout;
timeout.tv_sec = timeOutMillis / 1000;
timeout.tv_usec = (timeOutMillis % 1000) * 1000;
int reply;
SocketClient * sc;
for(Uint32 i=0; i < m_nSocketClients; i++) {
sc = m_socketClients[i];
if(strcmp(sc->gethostname(), remotehost)==0) {
if(sc->isConnected()) {
/*FD_ZERO(&tcpReadset);
reply = select(sc->getSocket()+1, 0, 0, 0, &timeout);
reply=1;
if(reply > 0) {*/
t.runSession(sc->getSocket(), t);
//}
}
}
}
}
template<class T>
inline
bool
SocketRegistry<T>::reconnect(const char * host){
for(Uint32 i=0; i < m_nSocketClients; i++) {
SocketClient * socketClient = m_socketClients[i];
if(strcmp(socketClient->gethostname(), host)==0) {
if(!socketClient->isConnected()) {
if(socketClient->openSocket() > 0)
return true;
else return false;
}
}
}
return false;
}
template<class T>
inline
bool
SocketRegistry<T>::removeSocketClient(const char * host){
for(Uint32 i=0; i < m_nSocketClients; i++) {
SocketClient * socketClient = m_socketClients[i];
if(strcmp(socketClient->gethostname(), host)==0) {
if(!socketClient->isConnected()) {
if(socketClient->closeSocket() > 0) {
delete socketClient;
return true;
}
else return false;
}
}
}
return false;
}
#endif // Define of SocketRegistry
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