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|
//=============================================================================
/**
* @file Process_Strategy_Test.cpp
*
* This is a test of the <ACE_Strategy_Acceptor> and
* <ACE_File_Lock> classes. The <ACE_Strategy_Acceptor> uses
* either the <ACE_Process_Strategy> (which forks a
* process-per-connection and runs as a concurrent server
* process), the <ACE_Thread_Strategy> (which spawns a
* thread-per-connection and runs as a concurrent server thread),
* or <ACE_Reactive_Strategy> (which register the <Svc_Handler>
* with the <Reactor> and runs in the main thread of control as an
* iterative server). This server queries and increments a
* "counting value" in a file.
*
* This test program can be run in the following ways:
*
* # Run the server "reactively" (i.e., iteratively)
* % Process_Strategy_Test -c REACTIVE
*
* # Run the server in multi-threads.
* % Process_Strategy_Test -c THREAD
*
* # Run the server in multi-processes
* % Process_Strategy_Test -c PROCESS
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu> and Kevin Boyle <kboyle@sanwafp.com>
*/
//=============================================================================
#include "test_config.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_unistd.h"
#include "ace/Acceptor.h"
#include "ace/Handle_Set.h"
#include "ace/Get_Opt.h"
#include "ace/Null_Condition.h"
#include "ace/Null_Mutex.h"
#include "ace/SOCK_Acceptor.h"
#include "ace/SOCK_Connector.h"
#include "ace/Strategies_T.h"
#include "ace/Singleton.h"
#include "ace/Synch_Traits.h"
#include "ace/File_Lock.h"
#include "ace/Lib_Find.h"
// Counting_Service and Options in here
#include "Process_Strategy_Test.h"
// This test does not function properly when fork() is used on HP-UX
#if defined(__hpux)
#define ACE_LACKS_FORK
#endif /* __hpux */
ACE_SINGLETON_TEMPLATE_INSTANTIATE(ACE_Singleton, Options, ACE_Null_Mutex);
// Define a <Strategy_Acceptor> that's parameterized by the
// <Counting_Service>.
typedef ACE_Strategy_Acceptor <Counting_Service, ACE_SOCK_ACCEPTOR> ACCEPTOR;
// Create an Options Singleton.
typedef ACE_Singleton<Options, ACE_Null_Mutex> OPTIONS;
// counter for connections
static size_t connections = 0;
// Use this to show down the process gracefully.
void
connection_completed ()
{
// Increment connection counter.
++connections;
// If all connections have been serviced.
if (connections == ACE_MAX_ITERATIONS + 1)
// Make sure that the event loop is interrupted.
ACE_Reactor::instance()->wakeup_all_threads ();
}
// Constructor
Process_Strategy::Process_Strategy (size_t n_processes,
ACE_Event_Handler *acceptor,
ACE_Reactor *r,
int avoid_zombies)
: ACE_Process_Strategy<Counting_Service> (n_processes,
acceptor,
r,
avoid_zombies)
{
}
// Destructor. g++ 2.7.2.3 gets very confused ("Internal compiler
// error") without it.
Process_Strategy::~Process_Strategy ()
{
}
// Overwrite the process creation method to include connection
// counting.
int
Process_Strategy::activate_svc_handler (Counting_Service *svc_handler,
void *arg)
{
// Call down to the base class
int const result =
ACE_Process_Strategy<Counting_Service>::activate_svc_handler (svc_handler,
arg);
// Connection is now complete
connection_completed ();
return result;
}
ACE_File_Lock &
Options::file_lock ()
{
return this->file_lock_;
}
ACE_Concurrency_Strategy <Counting_Service> *
Options::concurrency_strategy ()
{
return this->concurrency_strategy_;
}
const ACE_TCHAR *
Options::filename ()
{
return this->filename_;
}
Options::Options ()
:
// Choose to use processes by default.
#if !defined (ACE_LACKS_FORK)
concurrency_type_ (PROCESS)
#elif defined (ACE_HAS_THREADS)
concurrency_type_ (THREAD)
#else
concurrency_type_ (REACTIVE)
#endif /* !ACE_LACKS_FORK */
{
}
Options::~Options ()
{
delete this->concurrency_strategy_;
}
int
Options::parse_args (int argc, ACE_TCHAR *argv[])
{
ACE_Get_Opt get_opt (argc, argv, ACE_TEXT ("p:c:f:"));
// - 26 is for the "process_strategy_test_temp" that is appended
if (ACE::get_temp_dir (this->filename_, MAXPATHLEN - 26) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("Temporary path too long\n")),
-1);
ACE_OS::strcat (this->filename_, ACE_TEXT ("process_strategy_test_temp"));
for (int c; (c = get_opt ()) != -1; )
switch (c)
{
case 'c':
if (ACE_OS::strcmp (get_opt.opt_arg (),
ACE_TEXT ("REACTIVE")) == 0)
OPTIONS::instance ()->concurrency_type (Options::REACTIVE);
#if !defined (ACE_LACKS_FORK)
else if (ACE_OS::strcmp (get_opt.opt_arg (),
ACE_TEXT ("PROCESS")) == 0)
OPTIONS::instance ()->concurrency_type (Options::PROCESS);
#endif /* !ACE_LACKS_FORK */
#if defined (ACE_HAS_THREADS)
else if (ACE_OS::strcmp (get_opt.opt_arg (),
ACE_TEXT ("THREAD")) == 0)
OPTIONS::instance ()->concurrency_type (Options::THREAD);
#endif /* ACE_HAS_THREADS */
else
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("WARNING: concurrency strategy \"%s\" ")
ACE_TEXT ("is not supported\n"),
get_opt.opt_arg ()));
break;
case 'f':
ACE_OS::strcpy (this->filename_, get_opt.opt_arg ());
break;
default:
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("usage: %n [-f (filename)] ")
ACE_TEXT ("[-c (concurrency strategy)]\n%a"), 1));
/* NOTREACHED */
}
// Initialize the file lock. Note that this object lives beyond the
// lifetime of the Acceptor.
if (this->file_lock_.open (this->filename_,
O_RDWR | O_CREAT,
ACE_DEFAULT_FILE_PERMS) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("open")),
-1);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) opening %s on handle %d.\n"),
this->filename_,
this->file_lock_.get_handle ()));
int count = 0;
// Store the initial value of the count in the file.
if (ACE_OS::write (this->file_lock_.get_handle (),
(const void *) &count,
sizeof count) != (ssize_t) sizeof count)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n"),
ACE_TEXT ("write")));
// Initialize the Concurrency strategy.
switch (this->concurrency_type_)
{
case Options::PROCESS:
#if !defined (ACE_LACKS_FORK)
ACE_NEW_RETURN (this->concurrency_strategy_,
Process_Strategy (1,
this,
ACE_Reactor::instance (),
1), // Avoid zombies.
-1);
break;
#else
ACE_TEST_ASSERT ("PROCESS invalid on this platform" == 0);
#endif /* !defined (ACE_LACKS_FORK) */
case Options::THREAD:
#if defined (ACE_HAS_THREADS)
ACE_NEW_RETURN (this->concurrency_strategy_,
ACE_Thread_Strategy<Counting_Service>
(ACE_Thread_Manager::instance (),
THR_NEW_LWP,
1),
-1);
break;
#else
ACE_TEST_ASSERT (!"THREAD invalid on this platform");
#endif /* !ACE_HAS_THREADS */
case Options::REACTIVE:
// Settle for the purely Reactive strategy.
ACE_NEW_RETURN (this->concurrency_strategy_,
ACE_Reactive_Strategy<Counting_Service>
(ACE_Reactor::instance ()),
-1);
break;
}
return 0;
}
Options::Concurrency_Type
Options::concurrency_type ()
{
return this->concurrency_type_;
}
void
Options::concurrency_type (Options::Concurrency_Type cs)
{
this->concurrency_type_ = cs;
}
Counting_Service::Counting_Service (ACE_Thread_Manager *)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) creating the Counting_Service\n")));
}
// Read the current value from the shared file and return it to the
// client.
int
Counting_Service::read ()
{
ACE_READ_GUARD_RETURN (ACE_File_Lock, ace_mon, OPTIONS::instance ()->file_lock (), -1);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) reading on handle %d.\n"),
OPTIONS::instance ()->file_lock ().get_handle ()));
int count;
if (ACE_OS::pread (OPTIONS::instance ()->file_lock ().get_handle (),
(void *) &count,
sizeof count,
0) != (ssize_t) sizeof count)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n"),
ACE_TEXT ("read")),
-1);
char buf[BUFSIZ];
int n = ACE_OS::snprintf (buf, BUFSIZ, "count = %d\n", count);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) count = %d\n"),
count));
if (this->peer ().send_n (buf, n) != n)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n"),
ACE_TEXT ("send_n")),
-1);
return 0;
}
// Increment the current value in the shared file by 1.
int
Counting_Service::inc ()
{
ACE_WRITE_GUARD_RETURN (ACE_File_Lock, ace_mon,
OPTIONS::instance ()->file_lock (), -1);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) incrementing on handle %d.\n"),
OPTIONS::instance ()->file_lock ().get_handle ()));
int count;
if (ACE_OS::pread (OPTIONS::instance ()->file_lock ().get_handle (),
(void *) &count,
sizeof count,
0) != (ssize_t) sizeof count)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n"),
ACE_TEXT ("read")),
-1);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) incrementing count from %d to %d\n"),
count,
count + 1));
count++;
if (ACE_OS::pwrite (OPTIONS::instance ()->file_lock ().get_handle (),
(const void *) &count,
sizeof count,
0) != (ssize_t) sizeof count)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n"),
ACE_TEXT ("write")),
-1);
return 0;
}
// Receive the request from the client and call the appropriate
// operation.
int
Counting_Service::handle_input (ACE_HANDLE)
{
char buf[BUFSIZ];
ACE_Time_Value* timeout = 0;
#if defined (__hpux)
// Even though we're in handle_input, there seems to be a
// situation on HP-UX where there is nothing to recv just yet.
// So, we recv() with a timeout and everything works.
ACE_Time_Value hpux_timeout (3);
timeout = &hpux_timeout;
#endif /* __hpux */
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) reading from peer on %d\n"),
this->peer ().get_handle ()));
size_t len;
// Read the PDU length first.
ssize_t bytes = this->peer ().recv ((void *) &len,
sizeof len,
timeout);
if (bytes <= 0)
return -1;
bytes = this->peer ().recv (buf, len);
if (bytes <= 0 || buf[0] == (char) EOF)
return -1;
else
{
buf[len] = '\0';
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) %d bytes of input on %d is %*s\n"),
bytes,
this->peer ().get_handle (),
bytes,
ACE_TEXT_CHAR_TO_TCHAR (buf)));
// Read and return the current value in the file.
if (ACE_OS::strncmp (buf,
"read",
4) == 0)
return this->read ();
// Increment the current value in the file.
else if (ACE_OS::strncmp (buf, "inc", 3) == 0)
return this->inc ();
else
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) no match...\n")));
return 0;
}
}
int
Counting_Service::svc ()
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) handling thread\n")));
while (this->handle_input () >= 0)
continue;
return 0;
}
int
Counting_Service::handle_close (ACE_HANDLE,
ACE_Reactor_Mask)
{
// Count completed connections here only when the test is not in
// "process-per-connection" mode. In general, this should not be
// done here. Proper place for this is activate_svc_handler() but
// since only "process-per-connection" hooks into that function in
// other modes it's done here. The later creates a problem in
// "process-per-connection" mode since it calculates the same
// connection twice and as a result it cannot finalize gracefully.
if (OPTIONS::instance ()->concurrency_type () != Options::PROCESS)
{
// Done with another connection.
connection_completed ();
}
// Call down to base class
return ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>::handle_close ();
}
// This method is called back by the <Acceptor> once the client has
// connected and the process is forked or spawned.
int
Counting_Service::open (void *)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) opening service\n")));
if (OPTIONS::instance ()->concurrency_type () == Options::PROCESS)
{
// We need to rerun the event loop here since we ended up here
// due to being fork'd and we can't just return to our context
// because it's in the middle of a different event loop that
// won't behave properly since it's meant to handle connection
// establishment, *not* data transfer.
while (this->handle_input () >= 0)
continue;
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) About to exit from the child\n")));
// Exit the child.
ACE_OS::exit (0);
}
else if (OPTIONS::instance ()->concurrency_type () == Options::THREAD)
// We need to set this to 0 so that our <shutdown> method doesn't
// try to deregister <this> from the Reactor.
this->reactor (0);
return 0;
}
#if !defined (ACE_LACKS_FORK) || defined (ACE_HAS_THREADS)
// Execute the client tests.
void *
client (void *arg)
{
ACE_INET_Addr *remote_addr =
reinterpret_cast<ACE_INET_Addr *> (arg);
ACE_INET_Addr server_addr (remote_addr->get_port_number (),
ACE_DEFAULT_SERVER_HOST);
ACE_SOCK_Stream stream;
ACE_SOCK_Connector connector;
char buf[BUFSIZ];
const char *command = 0;
size_t command_len;
size_t i;
for (i = 0; i < ACE_MAX_ITERATIONS; i++)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) client iteration %d\n"),
i));
if (connector.connect (stream,
server_addr) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("open")),
0);
command = "inc";
command_len = ACE_OS::strlen (command);
#ifndef ACE_LACKS_VA_FUNCTIONS
if (stream.send (4,
&command_len, sizeof command_len,
command, command_len) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("send")),
0);
command = "read";
command_len = ACE_OS::strlen (command);
if (stream.send (4,
&command_len, sizeof command_len,
command, command_len) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("send")),
0);
else if (stream.recv (buf, sizeof buf) <= 0)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n"),
ACE_TEXT ("recv")),
0);
#else
ACE_UNUSED_ARG (command_len);
#endif
// ACE_DEBUG ((LM_DEBUG,
// ACE_TEXT ("(%P|%t) client iteration %d, buf = %C\n"),
// i, buf));
if (stream.close () == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("close")),
0);
}
command = "read";
command_len = ACE_OS::strlen (command);
ssize_t bytes_read = 0;
if (connector.connect (stream, server_addr) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("open")),
0);
#ifndef ACE_LACKS_VA_FUNCTIONS
else if (stream.send (4,
&command_len, sizeof command_len,
command, command_len) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("send")),
0);
#endif
else if ((bytes_read = stream.recv (buf, sizeof buf)) <= 0)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("recv")),
0);
else
{
// Null terminate buf to avoid an uninitialized memory read in
// the call to ACE_OS::strrchr ().
buf [bytes_read] = '\0';
size_t count = ACE_OS::atoi (ACE_OS::strrchr (ACE_TEXT_CHAR_TO_TCHAR (buf),
ACE_TEXT (' ')));
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) count = %d\n"),
count));
// Make sure that the count is correct.
if (count != ACE_MAX_ITERATIONS)
{
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("Error: Count invalid, has %d expected %d\n"),
count, ACE_MAX_ITERATIONS),
0);
}
}
if (stream.close () == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("close")),
0);
// Remove the filename.
ACE_OS::unlink (OPTIONS::instance ()->filename ());
return 0;
}
// Performs the server activities.
// Have all connections been serviced?
int
done ()
{
return connections == ACE_MAX_ITERATIONS + 1;
}
void *
server (void *)
{
int result = 0;
ACE_Reactor::instance ()->owner (ACE_Thread::self ());
while (!done () && result != -1)
// Run the main event loop.
result = ACE_Reactor::instance ()->handle_events ();
return 0;
}
#endif /* !ACE_LACKS_FORK || ACE_HAS_THREADS */
int
run_main (int argc, ACE_TCHAR *argv[])
{
ACE_START_TEST (ACE_TEXT ("Process_Strategy_Test"));
if (OPTIONS::instance ()->parse_args (argc, argv) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("parse_args")),
-1);
#ifndef ACE_LACKS_ACCEPT
ACCEPTOR acceptor;
ACE_INET_Addr server_addr;
// Bind acceptor to any port and then find out what the port was.
// Note that this implicitly creates the Reactor singleton.
if (acceptor.open (ACE_sap_any_cast (const ACE_INET_Addr &),
ACE_Reactor::instance(),
0,
0,
OPTIONS::instance ()->concurrency_strategy ()) == -1
|| acceptor.acceptor ().get_local_addr (server_addr) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("open")),
-1);
else
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) starting server at port %d\n"),
server_addr.get_port_number ()));
#if !defined (ACE_LACKS_FORK)
// We're running the client and serve as separate processes.
pid_t pid = ACE::fork (ACE_TEXT ("child"),
1); // Avoid zombies.
switch (pid)
{
case -1:
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n%a"),
ACE_TEXT ("fork failed")));
ACE_OS::exit (-1);
/* NOTREACHED */
case 0:
client (&server_addr);
break;
/* NOTREACHED */
default:
server (0);
break;
/* NOTREACHED */
}
#elif defined (ACE_HAS_THREADS)
if (ACE_Thread_Manager::instance ()->spawn
(ACE_THR_FUNC (server),
(void *) 0,
THR_NEW_LWP | THR_DETACHED) == -1)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n%a"),
ACE_TEXT ("thread create failed")));
if (ACE_Thread_Manager::instance ()->spawn
(ACE_THR_FUNC (client),
(void *) &server_addr,
THR_NEW_LWP | THR_DETACHED) == -1)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n%a"),
ACE_TEXT ("thread create failed")));
// Wait for the threads to exit.
ACE_Thread_Manager::instance ()->wait ();
#else
ACE_ERROR ((LM_INFO,
ACE_TEXT ("(%P|%t) only one thread may be run ")
ACE_TEXT ("in a process on this platform\n")));
#endif /* ACE_HAS_THREADS */
}
#endif // ACE_LACKS_ACCEPT
ACE_END_TEST;
return 0;
}
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