1 files changed, 80 insertions, 0 deletions
diff --git a/src/core/lib/channel/channel_trace_registry.cc b/src/core/lib/channel/channel_trace_registry.cc
new file mode 100644
index 0000000000..6c82431467
--- /dev/null
+++ b/src/core/lib/channel/channel_trace_registry.cc
@@ -0,0 +1,80 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <grpc/impl/codegen/port_platform.h>
+
+#include "src/core/lib/avl/avl.h"
+#include "src/core/lib/channel/channel_trace.h"
+#include "src/core/lib/channel/channel_trace_registry.h"
+#include "src/core/lib/gpr/useful.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+// file global lock and avl.
+static gpr_mu g_mu;
+static grpc_avl g_avl;
+static gpr_atm g_uuid = 0;
+
+// avl vtable for uuid (intptr_t) -> ChannelTrace
+// this table is only looking, it does not own anything.
+static void destroy_intptr(void* not_used, void* user_data) {}
+static void* copy_intptr(void* key, void* user_data) { return key; }
+static long compare_intptr(void* key1, void* key2, void* user_data) {
+  return GPR_ICMP(key1, key2);
+}
+
+static void destroy_channel_trace(void* trace, void* user_data) {}
+static void* copy_channel_trace(void* trace, void* user_data) { return trace; }
+static const grpc_avl_vtable avl_vtable = {
+    destroy_intptr, copy_intptr, compare_intptr, destroy_channel_trace,
+    copy_channel_trace};
+
+void grpc_channel_trace_registry_init() {
+  gpr_mu_init(&g_mu);
+  g_avl = grpc_avl_create(&avl_vtable);
+}
+
+void grpc_channel_trace_registry_shutdown() {
+  grpc_avl_unref(g_avl, nullptr);
+  gpr_mu_destroy(&g_mu);
+}
+
+intptr_t grpc_channel_trace_registry_register_channel_trace(
+    grpc_core::ChannelTrace* channel_trace) {
+  intptr_t prior = gpr_atm_no_barrier_fetch_add(&g_uuid, 1);
+  gpr_mu_lock(&g_mu);
+  g_avl = grpc_avl_add(g_avl, (void*)prior, channel_trace, nullptr);
+  gpr_mu_unlock(&g_mu);
+  return prior;
+}
+
+void grpc_channel_trace_registry_unregister_channel_trace(intptr_t uuid) {
+  gpr_mu_lock(&g_mu);
+  g_avl = grpc_avl_remove(g_avl, (void*)uuid, nullptr);
+  gpr_mu_unlock(&g_mu);
+}
+
+grpc_core::ChannelTrace* grpc_channel_trace_registry_get_channel_trace(
+    intptr_t uuid) {
+  gpr_mu_lock(&g_mu);
+  grpc_core::ChannelTrace* ret = static_cast<grpc_core::ChannelTrace*>(
+      grpc_avl_get(g_avl, (void*)uuid, nullptr));
+  gpr_mu_unlock(&g_mu);
+  return ret;
+}