X-Git-Url: http://xvm.mit.edu/gitweb/invirt/third/libt4.git/blobdiff_plain/5fd8cc8409d0efadc07dfe8d6774ad9ff477663d..f0dcb6b97d6d40f67698d1f71ac26970f1776f82:/handle.cc?ds=sidebyside

diff --git a/handle.cc b/handle.cc
index a233d5b..792ce40 100644
--- a/handle.cc
+++ b/handle.cc
@@ -1,114 +1,51 @@
 #include "handle.h"
-#include <stdio.h>
-#include "tprintf.h"
 
-handle_mgr mgr;
-
-handle::handle(std::string m) 
-{
-  h = mgr.get_handle(m);
-}
-
-rpcc *
-handle::safebind()
-{
-  if (!h)
-    return NULL;
-  ScopedLock ml(&h->cl_mutex);
-  if (h->del)
-    return NULL;
-  if (h->cl)
-    return h->cl;
-  sockaddr_in dstsock;
-  make_sockaddr(h->m.c_str(), &dstsock);
-  rpcc *cl = new rpcc(dstsock);
-  tprintf("handler_mgr::get_handle trying to bind...%s\n", h->m.c_str());
-  int ret;
-  // Starting with lab 6, our test script assumes that the failure
-  // can be detected by paxos and rsm layer within few seconds. We have
-  // to set the timeout with a small value to support the assumption.
-  // 
-  // Note: with RPC_LOSSY=5, your lab would failed to pass the tests of
-  // lab 6 and lab 7 because the rpc layer may delay your RPC request, 
-  // and cause a time out failure. Please make sure RPC_LOSSY is set to 0.
-  ret = cl->bind(rpcc::to(1000));
-  if (ret < 0) {
-    tprintf("handle_mgr::get_handle bind failure! %s %d\n", h->m.c_str(), ret);
-    delete cl;
-    h->del = true;
-  } else {
-    tprintf("handle_mgr::get_handle bind succeeded %s\n", h->m.c_str());
-    h->cl = cl;
-  }
-  return h->cl;
-}
-
-handle::~handle() 
-{
-  if (h) mgr.done_handle(h);
-}
-
-handle_mgr::handle_mgr()
-{
-  VERIFY (pthread_mutex_init(&handle_mutex, NULL) == 0);
-}
-
-struct hinfo *
-handle_mgr::get_handle(std::string m)
-{
-  ScopedLock ml(&handle_mutex);
-  struct hinfo *h = 0;
-  if (hmap.find(m) == hmap.end()) {
-    h = new hinfo;
-    h->cl = NULL;
-    h->del = false;
-    h->refcnt = 1;
-    h->m = m;
-    pthread_mutex_init(&h->cl_mutex, NULL);
-    hmap[m] = h;
-  } else if (!hmap[m]->del) {
-    h = hmap[m];
-    h->refcnt ++;
-  }
-  return h;
-}
-
-void 
-handle_mgr::done_handle(struct hinfo *h)
-{
-  ScopedLock ml(&handle_mutex);
-  h->refcnt--;
-  if (h->refcnt == 0 && h->del)
-    delete_handle_wo(h->m);
-}
-
-void
-handle_mgr::delete_handle(std::string m)
-{
-  ScopedLock ml(&handle_mutex);
-  delete_handle_wo(m);
+class hinfo {
+public:
+    unique_ptr<rpcc> client;
+    bool valid = true;
+    string destination;
+    mutex client_mutex;
+    hinfo(const string & destination_) : destination(destination_) {}
+};
+
+static mutex mgr_mutex;
+static map<string, shared_ptr<hinfo>> hmap;
+
+handle::handle(const string & destination) : destination_(destination) {
+    lock ml(mgr_mutex);
+    h = hmap[destination];
+    if (!h || !h->valid)
+        h = (hmap[destination] = make_shared<hinfo>(destination));
+}
+
+rpcc * handle::safebind() {
+    if (!h)
+        return nullptr;
+    lock cl(h->client_mutex);
+    if (!h->valid)
+        return nullptr;
+    if (!h->client) {
+        unique_ptr<rpcc> client(new rpcc(h->destination));
+        LOG("bind(\"" << h->destination << "\")");
+        int ret = client->bind(milliseconds(1000));
+        if (ret < 0) {
+            LOG("bind failure! " << h->destination << " " << ret);
+            h->valid = false;
+        } else {
+            LOG("bind succeeded " << h->destination);
+            h->client = move(client);
+        }
+    }
+    return h->client.get();
 }
 
-// Must be called with handle_mutex locked.
-void
-handle_mgr::delete_handle_wo(std::string m)
-{
-  if (hmap.find(m) == hmap.end()) {
-    tprintf("handle_mgr::delete_handle_wo: cl %s isn't in cl list\n", m.c_str());
-  } else {
-    tprintf("handle_mgr::delete_handle_wo: cl %s refcnt %d\n", m.c_str(),
-	   hmap[m]->refcnt);
-    struct hinfo *h = hmap[m];
-    if (h->refcnt == 0) {
-      if (h->cl) {
-        h->cl->cancel();
-        delete h->cl;
-      }
-      pthread_mutex_destroy(&h->cl_mutex);
-      hmap.erase(m);
-      delete h;
-    } else {
-      h->del = true;
+void handle::invalidate() {
+    h.reset();
+    lock ml(mgr_mutex);
+    if (hmap.find(destination_) != hmap.end()) {
+        hmap[destination_]->valid = false;
+        LOG_NONMEMBER("cl " << destination_ << " refcnt " << hmap[destination_].use_count());
+        hmap.erase(destination_);
     }
-  }
 }