Monitor object added

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

6 files changed, 155 insertions, 4 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 4d3cba3..f38dd0a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -34,6 +34,7 @@ libzmq_la_SOURCES = \
     lb.hpp \
     likely.hpp \
     mailbox.hpp \
+    monitor.hpp \
     msg.hpp \
     mtrie.hpp \
     mutex.hpp \
@@ -94,6 +95,7 @@ libzmq_la_SOURCES = \
     kqueue.cpp \
     lb.cpp \
     mailbox.cpp \
+    monitor.cpp \
     msg.cpp \
     mtrie.cpp \
     object.cpp \
diff --git a/src/ctx.cpp b/src/ctx.cpp
index 54e665a..3ef2d4a 100644
--- a/src/ctx.cpp
+++ b/src/ctx.cpp
@@ -32,6 +32,7 @@
 #include "ctx.hpp"
 #include "socket_base.hpp"
 #include "io_thread.hpp"
+#include "monitor.hpp"
 #include "reaper.hpp"
 #include "pipe.hpp"
 #include "err.hpp"
@@ -79,6 +80,13 @@ zmq::ctx_t::ctx_t (uint32_t io_threads_) :
     zmq_assert (log_socket);
     rc = log_socket->bind ("sys://log");
     zmq_assert (rc == 0);
+
+    //  Create the monitor object.
+    io_thread_t *io_thread = choose_io_thread (0);
+    zmq_assert (io_thread);
+    monitor = new (std::nothrow) monitor_t (io_thread);
+    alloc_assert (monitor);
+    monitor->start ();
 }
 
 bool zmq::ctx_t::check_tag ()
@@ -123,15 +131,23 @@ int zmq::ctx_t::terminate ()
     //  First attempt to terminate the context.
     if (!restarted) {
 
+        //  Close the monitor object. Wait for done command from the monitor.
+        monitor->stop ();
+        command_t cmd;
+        int rc = term_mailbox.recv (&cmd, -1);
+        zmq_assert (rc == 0);
+        zmq_assert (cmd.type == command_t::done);
+
         //  Close the logging infrastructure.
         log_sync.lock ();
-        int rc = log_socket->close ();
+        rc = log_socket->close ();
         zmq_assert (rc == 0);
         log_socket = NULL;
         log_sync.unlock ();
 
-        //  First send stop command to sockets so that any blocking calls can be
-        //  interrupted. If there are no sockets we can ask reaper thread to stop.
+        //  First send stop command to sockets so that any blocking calls
+        //  can be interrupted. If there are no sockets we can ask reaper
+        //  thread to stop.
         slot_sync.lock ();
         terminating = true;
         for (sockets_t::size_type i = 0; i != sockets.size (); i++)
diff --git a/src/ctx.hpp b/src/ctx.hpp
index bcffcd7..6a337d5 100644
--- a/src/ctx.hpp
+++ b/src/ctx.hpp
@@ -39,6 +39,7 @@ namespace zmq
 {
 
     class object_t;
+    class monitor_t;
     class io_thread_t;
     class socket_base_t;
     class reaper_t;
@@ -152,6 +153,9 @@ namespace zmq
         zmq::socket_base_t *log_socket;
         mutex_t log_sync;
 
+        //  Monitor object attached to the context.
+        zmq::monitor_t *monitor;
+
         //  Maximum socket ID.
         static atomic_counter_t max_socket_id;
 
diff --git a/src/monitor.cpp b/src/monitor.cpp
new file mode 100644
index 0000000..77bb8f1
--- /dev/null
+++ b/src/monitor.cpp
@@ -0,0 +1,68 @@
+/*
+    Copyright (c) 2012 250bpm s.r.o.
+    Copyright (c) 2012 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "monitor.hpp"
+#include "io_thread.hpp"
+#include "options.hpp"
+#include "random.hpp"
+#include "err.hpp"
+
+zmq::monitor_t::monitor_t (zmq::io_thread_t *io_thread_) :
+    own_t (io_thread_, options_t ()),
+    io_object_t (io_thread_)
+{
+}
+
+zmq::monitor_t::~monitor_t ()
+{
+}
+
+void zmq::monitor_t::start ()
+{
+    send_plug (this);
+}
+
+void zmq::monitor_t::stop ()
+{
+    send_stop ();
+}
+
+void zmq::monitor_t::process_plug ()
+{
+    //  Schedule sending of the first snapshot.
+    add_timer (500 + (generate_random () % 1000), timer_id);
+}
+
+void zmq::monitor_t::process_stop ()
+{
+    cancel_timer (timer_id);
+    send_done ();
+    delete this;
+}
+
+void zmq::monitor_t::timer_event (int id_)
+{
+    zmq_assert (id_ == timer_id);
+
+    //  TODO: Send the snapshot here!
+
+    //  Wait before sending next snapshot.
+    add_timer (500 + (generate_random () % 1000), timer_id);
+}
diff --git a/src/monitor.hpp b/src/monitor.hpp
new file mode 100644
index 0000000..439939f
--- /dev/null
+++ b/src/monitor.hpp
@@ -0,0 +1,60 @@
+/*
+    Copyright (c) 2012 250bpm s.r.o.
+    Copyright (c) 2012 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_MONITOR_HPP_INCLUDED__
+#define __ZMQ_MONITOR_HPP_INCLUDED__
+
+#include "own.hpp"
+#include "io_object.hpp"
+
+namespace zmq
+{
+
+    class io_thread_t;
+    class socket_base_t;
+
+    class monitor_t : public own_t, public io_object_t
+    {
+    public:
+
+        monitor_t (zmq::io_thread_t *io_thread_);
+        ~monitor_t ();
+
+        void start ();
+        void stop ();
+
+    private:
+
+        enum {timer_id = 0x44};
+
+        //  Handlers for incoming commands.
+        void process_plug ();
+        void process_stop ();
+
+        //  Events from the poller.
+        void timer_event (int id_);
+
+        monitor_t (const monitor_t&);
+        const monitor_t &operator = (const monitor_t&);
+    };
+
+}
+
+#endif
diff --git a/src/zmq.cpp b/src/zmq.cpp
index 84dcdd1..6417d8e 100644
--- a/src/zmq.cpp
+++ b/src/zmq.cpp
@@ -92,7 +92,8 @@ const char *zmq_strerror (int errnum_)
 
 void *zmq_init (int io_threads_)
 {
-    if (io_threads_ < 0) {
+    //  We need at least one I/O thread to run the monitor object in.
+    if (io_threads_ < 1) {
         errno = EINVAL;
         return NULL;
     }