X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/75376c75e169d332315f02a0e3665f7641c67f42..d7a651438f69a3bb0570abb08bafecfe550e8c3f:/examples/s4u/launching/s4u_launching.cpp

diff --git a/examples/s4u/launching/s4u_launching.cpp b/examples/s4u/launching/s4u_launching.cpp
index 85f512a80c..49e2a4c65f 100644
--- a/examples/s4u/launching/s4u_launching.cpp
+++ b/examples/s4u/launching/s4u_launching.cpp
@@ -3,16 +3,119 @@
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
-#include <xbt/sysdep.h>
+
+/* This example shows how to declare and start your actors.
+ *
+ * The first step is to declare the code of your actors (what they do exactly
+ * does not matter to this example) and then you ask SimGrid to start your
+ * actors. There is three ways of doing so:
+ *  - Directly, by instantiating your actor as paramter to Actor::create();
+ *  - By first registering your actors before instantiating it;
+ *  - Through the deployment file.
+ *
+ * This example shows all these solutions, even if you obviously should use
+ * only one of these solutions to start your actors. The most advised solution
+ * is to use a deployment file, as it creates a clear separation between your
+ * application and the settings to test it. This is a better scientific
+ * methodology. Actually, starting an actor with Actor::create() is mostly
+ * useful to start an actor from another actor.
+ *
+ */
+
 #include <simgrid/s4u.hpp>
 
-#include "s4u_launching.h"
+// This declares a logging channel so that XBT_INFO can be used later
+XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_launching_test, "The logging channel used in this example");
+
+
+/* Declares a first class of actors which sends a message to the mailbox 'mb42'.
+ * The sent message is what was passed as parameter on creation (or 'GaBuZoMeu' by default)
+ *
+ * Later, this actor class is instantiated twice in the simulation.
+ */
+class Sender {
+public:
+  std::string msg = "GaBuZoMeu";
+  explicit Sender() {
+    /* Constructor used when no parameter is passed to the actor */
+  };
+  explicit Sender(std::vector<std::string> args) {
+    /* This constructor is used when we pass parameters to the actor */
+    if (args.size() > 0)
+      msg = args[0];
+  }
+  void operator()() {
+    XBT_INFO("Hello s4u, I have something to send");
+    simgrid::s4u::MailboxPtr mailbox = simgrid::s4u::Mailbox::byName("mb42");
+
+    simgrid::s4u::this_actor::send(mailbox, xbt_strdup(msg.c_str()), msg.size());
+    XBT_INFO("I'm done. See you.");
+  }
+};
+
+
+/* Declares a second class of actor which receive two messages on the mailbox which
+ * name is passed as parameter ('thingy' by default, ie the wrong one).
+ *
+ * Later, this actor class is instantiated once in the simulation.
+ */
+class Receiver {
+public:
+  simgrid::s4u::MailboxPtr mailbox = simgrid::s4u::Mailbox::byName("thingy");
+
+  explicit Receiver() = default;
+  explicit Receiver(std::vector<std::string> args) {
+    /* This constructor is used when we pass parameters to the actor */
+    /* as with argc/argv, args[0] is the actor's name, so the first parameter is args[1] */
+
+    /* FIXME: this is a bug as this does not happen when starting the process directly
+     * We should fix it by not adding the process name as argv[0] from the deployment file,
+     * which is useless anyway since it's always the function name in this setting.
+     * But this will break MSG...
+     */
+    if (args.size() > 1)
+      mailbox = simgrid::s4u::Mailbox::byName(args[1]);
+  }
+  void operator()() {
+    XBT_INFO("Hello s4u, I'm ready to get any message you'd want on %s", mailbox->name());
 
+    char *msg1 = static_cast<char*>(simgrid::s4u::this_actor::recv(mailbox));
+    char *msg2 = static_cast<char*>(simgrid::s4u::this_actor::recv(mailbox));
+    XBT_INFO("I received '%s' and '%s'",msg1,msg2);
+    XBT_INFO("I'm done. See you.");
+  }
+};
+
+
+/* Here comes the main function of your program */
 int main(int argc, char **argv) {
+  /* When your program starts, you have to first start a new simulation engine, as follows */
   simgrid::s4u::Engine *e = new simgrid::s4u::Engine(&argc,argv);
-  e->loadPlatform("../../platforms/two_hosts.xml");
-  simgrid::s4u::Actor::createActor("worker", simgrid::s4u::Host::by_name("Tremblay"), Worker());
-  simgrid::s4u::Actor::createActor("master", simgrid::s4u::Host::by_name("Jupiter"), Master());
+
+  /* Then you should load a platform file, describing your simulated platform */
+  e->loadPlatform("../../platforms/small_platform.xml");
+
+  /* And now you have to ask SimGrid to actually start your actors.
+   *
+   * You can first directly start your actor, as follows. Note the last parameter: 'Sender()',
+   * as if you would call the Sender function.
+   */
+  simgrid::s4u::Actor::createActor("sender1", simgrid::s4u::Host::by_name("Tremblay"), Sender());
+
+  /* The second way is to first register your function, and then retrieve it */
+  e->registerFunction<Sender>("sender"); // The sender is passed as a template parameter here
+  std::vector<std::string> args;  // Here we declare the parameter that the actor will get
+  args.push_back("GloubiBoulga"); // Add a parameter to the set (we could have done it in the first approach too)
+
+  simgrid::s4u::Actor::createActor("sender2", simgrid::s4u::Host::by_name("Jupiter"), "sender", args);
+
+  /* The third way to start your actors is to use a deployment file. */
+  e->registerFunction<Receiver>("receiver"); // You first have to register the actor as with the second approach
+  e->loadDeployment("deployment.xml");       // And then, you load the deployment file
+
+  /* Once every actors are started in the engine, the simulation can start */
   e->run();
+
+  /* Once the simulation is done, the program is ended */
   return 0;
 }