From e49115224a7957b0e5d49326bc02ae6af186eaf9 Mon Sep 17 00:00:00 2001
From: Martin Sustrik <sustrik@fastmq.commkdir>
Date: Tue, 15 Dec 2009 09:09:19 +0100
Subject: zmq_encoder/decoder are able to add/trim prefixes from messages; fair
 queueing and load balancing algorithms factorised into separate classes

---
 src/upstream.cpp | 58 +++++++-------------------------------------------------
 1 file changed, 7 insertions(+), 51 deletions(-)

(limited to 'src/upstream.cpp')

diff --git a/src/upstream.cpp b/src/upstream.cpp
index da202f8..32de63a 100644
--- a/src/upstream.cpp
+++ b/src/upstream.cpp
@@ -21,12 +21,9 @@
 
 #include "upstream.hpp"
 #include "err.hpp"
-#include "pipe.hpp"
 
 zmq::upstream_t::upstream_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
-    active (0),
-    current (0)
+    socket_base_t (parent_)
 {
     options.requires_in = true;
     options.requires_out = false;
@@ -40,21 +37,13 @@ void zmq::upstream_t::xattach_pipes (class reader_t *inpipe_,
     class writer_t *outpipe_)
 {
     zmq_assert (inpipe_ && !outpipe_);
-
-    pipes.push_back (inpipe_);
-    pipes.swap (active, pipes.size () - 1);
-    active++;
+    fq.attach (inpipe_);
 }
 
 void zmq::upstream_t::xdetach_inpipe (class reader_t *pipe_)
 {
-    //  Remove the pipe from the list; adjust number of active pipes
-    //  accordingly.
     zmq_assert (pipe_);
-    pipes_t::size_type index = pipes.index (pipe_);
-    if (index < active)
-        active--;
-    pipes.erase (index);
+    fq.detach (pipe_);
 }
 
 void zmq::upstream_t::xdetach_outpipe (class writer_t *pipe_)
@@ -65,16 +54,12 @@ void zmq::upstream_t::xdetach_outpipe (class writer_t *pipe_)
 
 void zmq::upstream_t::xkill (class reader_t *pipe_)
 {
-    //  Move the pipe to the list of inactive pipes.
-    active--;
-    pipes.swap (pipes.index (pipe_), active);
+    fq.kill (pipe_);
 }
 
 void zmq::upstream_t::xrevive (class reader_t *pipe_)
 {
-    //  Move the pipe to the list of active pipes.
-    pipes.swap (pipes.index (pipe_), active);
-    active++;
+    fq.revive (pipe_);
 }
 
 int zmq::upstream_t::xsetsockopt (int option_, const void *optval_,
@@ -99,41 +84,12 @@ int zmq::upstream_t::xflush ()
 
 int zmq::upstream_t::xrecv (zmq_msg_t *msg_, int flags_)
 {
-    //  Deallocate old content of the message.
-    zmq_msg_close (msg_);
-
-    //  Round-robin over the pipes to get next message.
-    for (int count = active; count != 0; count--) {
-        bool fetched = pipes [current]->read (msg_);
-        current++;
-        if (current >= active)
-            current = 0;
-        if (fetched)
-            return 0;
-    }
-
-    //  No message is available. Initialise the output parameter
-    //  to be a 0-byte message.
-    zmq_msg_init (msg_);
-    errno = EAGAIN;
-    return -1;
+    return fq.recv (msg_, flags_);
 }
 
 bool zmq::upstream_t::xhas_in ()
 {
-    //  Note that messing with current doesn't break the fairness of fair
-    //  queueing algorithm. If there are no messages available current will
-    //  get back to its original value. Otherwise it'll point to the first
-    //  pipe holding messages, skipping only pipes with no messages available.
-    for (int count = active; count != 0; count--) {
-        if (pipes [current]->check_read ())
-            return true;
-        current++;
-        if (current >= active)
-            current = 0;
-    }
-
-    return false;
+    return fq.has_in ();
 }
 
 bool zmq::upstream_t::xhas_out ()
-- 
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