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<META NAME="Author" CONTENT="Ambreen Ilyas">
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<TITLE>Example 9</TITLE>
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<FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<BR><FONT COLOR="#CC0000">//// This example is from the ACE Programmers
Guide.</FONT>
<BR><FONT COLOR="#CC0000">//// Chapter: "The Acceptor/Connector"
(Connection Initialization)</FONT>
<BR><FONT COLOR="#CC0000">//// For details please see the guide at</FONT>
<BR><FONT COLOR="#CC0000">//// http://www.cs.wustl.edu/~schmidt/ACE.html</FONT>
<BR><FONT COLOR="#CC0000">//// AUTHOR: Umar Syyid (usyyid@hns.com)</FONT>
<BR><FONT COLOR="#CC0000">//// and Ambreen Ilyas (ambreen@bitsmart.com)</FONT>
<BR><FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<P><FONT COLOR="#CC0000">//Example 9</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/Reactor.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT><FONT COLOR="#663366"> </FONT><FONT COLOR="#006600">"ace/Svc_Handler.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT><FONT COLOR="#006600"> "ace/Connector.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT><FONT COLOR="#006600"> "ace/Synch.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/SOCK_Connector.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/INET_Addr.h"</FONT>
<P><FONT COLOR="#000099">#define</FONT> <FONT COLOR="#663366">PORT_NUM
10101</FONT>
<BR><FONT COLOR="#000099">#define</FONT> <FONT COLOR="#663366">DATA_SIZE
16</FONT>
<P><FONT COLOR="#FF0000">//forward declaration</FONT>
<BR>class My_Svc_Handler;
<BR><FONT COLOR="#FF0000">//Function prototype</FONT>
<BR>static void make_connections(void *arg);
<P><FONT COLOR="#FF0000">// Template specializations for the hashing function
for the</FONT>
<BR><FONT COLOR="#FF0000">// hash_map which is used by the cache. The cache
is used internally by the</FONT>
<BR><FONT COLOR="#FF0000">// Cached Connection Strategy . Here we use ACE_Hash_Addr</FONT>
<BR><FONT COLOR="#FF0000">// as our external identifier. This utility class
has already</FONT>
<BR><FONT COLOR="#FF0000">// overloaded the == operator and the hash()
method. (The</FONT>
<BR><FONT COLOR="#FF0000">// hashing function). The hash() method delgates
the work to</FONT>
<BR><FONT COLOR="#FF0000">// hash_i() and we use the IP address and port
to get a</FONT>
<BR><FONT COLOR="#FF0000">// a unique integer hash value.</FONT>
<BR>size_t
<BR>ACE_Hash_Addr<ACE_INET_Addr>::hash_i (const ACE_INET_Addr &addr)
const
<BR>{
<BR> return addr.get_ip_address () + addr.get_port_number ();
<BR>}
<P><FONT COLOR="#FF0000">//instantiate a strategy acceptor</FONT>
<BR>typedef ACE_Strategy_Connector<My_Svc_Handler,ACE_SOCK_CONNECTOR>
<BR>STRATEGY_CONNECTOR;
<P><FONT COLOR="#FF0000">//Instantiate the Creation Strategy</FONT>
<BR>typedef ACE_NOOP_Creation_Strategy<My_Svc_Handler>
<BR> NULL_CREATION_STRATEGY;
<BR><FONT COLOR="#FF0000">//Instantiate the Concurrency Strategy</FONT>
<BR>typedef ACE_NOOP_Concurrency_Strategy<My_Svc_Handler>
<BR> NULL_CONCURRENCY_STRATEGY;
<BR><FONT COLOR="#FF0000">//Instantiate the Connection Strategy</FONT>
<BR>typedef ACE_Cached_Connect_Strategy<My_Svc_Handler,
<BR>
ACE_SOCK_CONNECTOR,
<BR>
ACE_SYNCH_RW_MUTEX>
<BR> CACHED_CONNECT_STRATEGY;
<BR>
<BR>class My_Svc_Handler:
<BR>public ACE_Svc_Handler <ACE_SOCK_STREAM,ACE_MT_SYNCH>{
<BR>private:
<BR>char* data;
<P>public:
<BR>My_Svc_Handler(){
<BR>data= new char[DATA_SIZE];
<BR> }
<BR>My_Svc_Handler(ACE_Thread_Manager* tm){
<BR>data= new char[DATA_SIZE];
<BR> }
<BR><FONT COLOR="#FF0000">//Called before the service handler is recycled..</FONT>
<BR>int
<BR>recycle (void *a=0){
<BR> ACE_DEBUG ((LM_DEBUG,
<BR> "(%P|%t) recycling Svc_Handler %d with handle %d\n",
<BR>
this, this->peer ().get_handle ()));
<BR> return 0;
<BR> }
<P>int open(void*){
<BR> ACE_DEBUG((LM_DEBUG,"(%t)Connection established \n"));
<BR>
<BR>
<BR>
<P><FONT COLOR="#FF0000"> //Register the service handler with the
reactor</FONT>
<BR> ACE_Reactor::instance() ->register_handler(this,ACE_Event_Handler::READ_MASK);
<BR> activate(THR_NEW_LWP|THR_DETACHED);
<BR> return 0;
<BR> }
<P>int handle_input(ACE_HANDLE){
<BR> ACE_DEBUG((LM_DEBUG,"Got input in thread: (%t) \n"));
<BR> peer().recv_n(data,DATA_SIZE);
<BR> ACE_DEBUG((LM_DEBUG,"<< %s\n",data));
<P> <FONT COLOR="#FF0000">//keep yourself registered with the reactor</FONT>
<BR> return 0;
<BR>}
<P>int svc(void){
<BR><FONT COLOR="#FF0000"> //send a few messages and then mark connection
as idle so that it can be recycled later.</FONT>
<BR> ACE_DEBUG((LM_DEBUG,"Started the service routine \n"));
<P> for(int i=0;i<3;i++){
<BR> ACE_DEBUG((LM_DEBUG,"(%t)>>Hello World\n"));
<BR> ACE_OS::fflush(stdout);
<BR> peer().send_n("Hello World",sizeof("Hello World"));
<BR> }
<P> <FONT COLOR="#FF0000">//Mark the service handler as being idle
now and let the other threads reuse this connection</FONT>
<BR> this->idle(1);
<P> <FONT COLOR="#FF0000">//Wait for the thread to die</FONT>
<BR> this->thr_mgr()->wait();
<BR> return 0;
<BR> }
<BR>};
<BR>ACE_INET_Addr *addr;
<P>int main(int argc, char* argv[]){
<BR> addr= new ACE_INET_Addr(PORT_NUM,argv[1]);
<BR><FONT COLOR="#FF0000"> //Creation Strategy</FONT>
<BR> NULL_CREATION_STRATEGY creation_strategy;
<P><FONT COLOR="#FF0000"> //Concurrency Strategy</FONT>
<BR> NULL_CONCURRENCY_STRATEGY concurrency_strategy;
<P><FONT COLOR="#FF0000"> //Connection Strategy</FONT>
<BR> CACHED_CONNECT_STRATEGY caching_connect_strategy;
<BR>
<P><FONT COLOR="#FF0000"> //instantiate the connector</FONT>
<BR> STRATEGY_CONNECTOR connector(
<BR> ACE_Reactor::instance(),<FONT COLOR="#FF0000"> //the reactor
to use</FONT>
<BR> &creation_strategy,
<BR> &caching_connect_strategy,
<BR> &concurrency_strategy);
<BR><FONT COLOR="#FF0000"> //Use the thread manager to spawn
a single thread to</FONT>
<BR><FONT COLOR="#FF0000"> //connect multiple times passing it the
address</FONT>
<BR><FONT COLOR="#FF0000"> //of the strategy connector</FONT>
<BR> if(ACE_Thread_Manager::instance()->spawn(
<BR> (ACE_THR_FUNC) make_connections,
<BR> (void *) &connector,
<BR> THR_NEW_LWP) == -1)
<BR> ACE_ERROR ((LM_ERROR, "(%P|%t) %p\n%a", "client thread spawn
failed"));
<P>while(1) /* Start the reactor?s event loop */
<BR> ACE_Reactor::instance()->handle_events();
<BR>}
<P><FONT COLOR="#FF0000">//Connection establishment function, tries to
establish connections</FONT>
<BR><FONT COLOR="#FF0000">//to the same server again and re-uses the connections
from the</FONT>
<BR><FONT COLOR="#FF0000">//cache</FONT>
<BR>void make_connections(void *arg){
<BR> ACE_DEBUG((LM_DEBUG,"(%t)Prepared to connect \n"));
<BR> STRATEGY_CONNECTOR *connector= (STRATEGY_CONNECTOR*) arg;
<BR> for (int i = 0; i < 10; i++){
<BR> My_Svc_Handler *svc_handler = 0;
<BR>
<P> <FONT COLOR="#FF0000">// Perform a blocking connect to the server
using the Strategy</FONT>
<BR><FONT COLOR="#FF0000"> // Connector with a connection caching
strategy. Since we are</FONT>
<BR><FONT COLOR="#FF0000"> // connecting to the same <server_addr>
these calls will return the</FONT>
<BR><FONT COLOR="#FF0000"> // same dynamically allocated <Svc_Handler>
for each <connect> call.</FONT>
<BR> if (connector->connect (svc_handler, *addr) == -1){
<BR> ACE_ERROR ((LM_ERROR, "(%P|%t) %p\n", "connection failed\n"));
<BR> return;
<BR> }
<P><FONT COLOR="#FF0000"> // Rest for a few seconds so that the connection
has been freed up</FONT>
<BR> ACE_OS::sleep (5);
<BR> }
<BR>}
<BR>
<BR> <A HREF="ex10.html">Next Example</A>
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