Hariharan/vbucket trait

.gitignore

@@ -8,3 +8,5 @@ GTAGS
 
 /cmake-build-debug/
 /.idea/
+/.clang-format
+__pycache__/

CMakeLists.txt

@@ -125,7 +125,7 @@ endif()
 
 if(NOT CMAKE_CXX_FLAGS)
 #TODO: add -Werror
- set (CMAKE_CXX_FLAGS "-Wall -Wextra ${CMAKE_CXX_FLAGS}")
+ set (CMAKE_CXX_FLAGS "-Wall -Wextra ${CMAKE_CXX_FLAGS} -DCATCH_CONFIG_FAST_COMPILE")
  message (STATUS "Warnings Configuration: default: ${CMAKE_CXX_FLAGS}")
 endif()
 

src/CMakeLists.txt

@@ -32,8 +32,7 @@ set(HERMES_SRCS
   ${CMAKE_CURRENT_SOURCE_DIR}/api/hermes.cc
   ${CMAKE_CURRENT_SOURCE_DIR}/api/vbucket.cc
   ${CMAKE_CURRENT_SOURCE_DIR}/buffer_pool.cc
-  ${CMAKE_CURRENT_SOURCE_DIR}/data_placement_engine.cc
-)
+  ${CMAKE_CURRENT_SOURCE_DIR}/data_placement_engine.cc)
 
 #------------------------------------------------------------------------------
 # Libraries

src/api/hermes.cc

@@ -61,6 +61,14 @@ void Hermes::AppBarrier() {
   hermes::SubBarrier(&comm_);
 }
 
+bool Hermes::BucketContainsBlob(const std::string &bucket_name,
+                                const std::string &blob_name) {
+  BucketID bucket_id = GetBucketIdByName(&context_, &rpc_, bucket_name.c_str());
+  bool result = hermes::ContainsBlob(&context_, &rpc_, bucket_id, blob_name);
+
+  return result;
+}
+
 int Hermes::GetProcessRank() {
   int result = comm_.sub_proc_id;
 

src/api/hermes.h

@@ -11,6 +11,7 @@
 
 #include "hermes_types.h"
 #include "buffer_pool.h"
+#include "metadata_management.h"
 #include "rpc.h"
 #include "id.h"
 
@@ -58,6 +59,9 @@ class Hermes {
   void *GetAppCommunicator();
   void Finalize(bool force_rpc_shutdown = false);
 
+  bool BucketContainsBlob(const std::string &bucket_name,
+                          const std::string &blob_name);
+
   // MPI comms.
   // proxy/reference to Hermes core
 };

src/api/traits.cc

@@ -0,0 +1,52 @@
+#include "traits.h"
+
+#include <functional>
+
+namespace hermes {
+namespace api {
+Trait::Trait(TraitID id, TraitIdArray conflict_traits, TraitType type)
+    : id(id),
+      conflict_traits(conflict_traits),
+      type(type),
+      onAttachFn(nullptr),
+      onDetachFn(nullptr),
+      onLinkFn(nullptr),
+      onUnlinkFn(nullptr) {}
+
+FileMappingTrait::FileMappingTrait(
+    std::string &filename, std::unordered_map<std::string, u64> &offset_map,
+    TraitCallback flush_cb, TraitCallback load_cb)
+    : Trait(HERMES_FILE_TRAIT, TraitIdArray(), TraitType::FILE_MAPPING),
+      flush_cb(flush_cb),
+      load_cb(load_cb),
+      filename(filename),
+      offset_map(offset_map) {
+  this->onAttachFn = std::bind(&FileMappingTrait::onAttach, this,
+                               std::placeholders::_1, std::placeholders::_2);
+  this->onDetachFn = std::bind(&FileMappingTrait::onDetach, this,
+                               std::placeholders::_1, std::placeholders::_2);
+  this->onLinkFn = std::bind(&FileMappingTrait::onLink, this,
+                             std::placeholders::_1, std::placeholders::_2);
+  this->onUnlinkFn = std::bind(&FileMappingTrait::onUnlink, this,
+                               std::placeholders::_1, std::placeholders::_2);
+}
+void FileMappingTrait::onAttach(TraitInput &input, Trait *trait) {
+  if (load_cb) {
+    load_cb(input, trait);
+    // TODO(hari): @errorhandling Check if load was successful
+  }
+}
+void FileMappingTrait::onDetach(TraitInput &input, Trait *trait) {
+  if (flush_cb) {
+    flush_cb(input, trait);
+    // TODO(hari): @errorhandling Check if flush was successful
+  }
+}
+void FileMappingTrait::onLink(TraitInput &input, Trait *trait) {
+  onAttach(input, trait);
+}
+void FileMappingTrait::onUnlink(TraitInput &input, Trait *trait) {
+  onDetach(input, trait);
+}
+}  // namespace api
+}  // namespace hermes

src/api/traits.h

@@ -0,0 +1,50 @@
+#ifndef HERMES_TRAITS_H
+#define HERMES_TRAITS_H
+
+#include <unordered_map>
+
+#include "hermes_types.h"
+
+namespace hermes {
+namespace api {
+
+struct BlobInfo {
+  std::string bucket_name;
+  std::string blob_name;
+};
+
+typedef BlobInfo TraitInput;
+struct Trait;
+typedef std::function<void(TraitInput &, Trait *)> TraitCallback;
+
+struct Trait {
+  TraitID id;
+  TraitIdArray conflict_traits;
+  TraitType type;
+  TraitCallback onAttachFn;
+  TraitCallback onDetachFn;
+  TraitCallback onLinkFn;
+  TraitCallback onUnlinkFn;
+  Trait(TraitID id, TraitIdArray conflict_traits, TraitType type);
+};
+
+#define HERMES_FILE_TRAIT 10
+
+struct FileMappingTrait : public Trait {
+ public:
+  TraitCallback flush_cb;
+  TraitCallback load_cb;
+  std::string filename;
+  std::unordered_map<std::string, u64> offset_map;
+  FileMappingTrait(std::string &filename,
+                   std::unordered_map<std::string, u64> &offset_map,
+                   TraitCallback flush_cb, TraitCallback load_cb);
+  void onAttach(TraitInput &blob, Trait *trait);
+  void onDetach(TraitInput &blob, Trait *trait);
+  void onLink(TraitInput &blob, Trait *trait);
+  void onUnlink(TraitInput &blob, Trait *trait);
+};
+}  // namespace api
+}  // namespace hermes
+
+#endif  // HERMES_TRAITS_H