init information maintainer

CMakeLists.txt

@@ -5,9 +5,10 @@ set(CMAKE_CXX_STANDARD 11)
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 include_directories(thirdparty/local/include)
-link_directories(thirdparty/local/lib)
 add_subdirectory(thirdparty/pybind11-2.2.1)
 
+link_directories(thirdparty/local/lib)
+
 set(SOURCE_FILES
         visualdl/backend/storage/storage.cc visualdl/backend/storage/storage.h
         visualdl/backend/storage/storage.pb.h
@@ -16,4 +17,13 @@ set(SOURCE_FILES
 
 add_library(storage visualdl/backend/storage/storage.cc
             visualdl/backend/storage/storage.pb.cc)
-add_executable(VisualDL ${SOURCE_FILES})
+add_library(c_api visualdl/backend/logic/c_api.cc)
\ No newline at end of file
+add_library(sdk visualdl/backend/logic/sdk.cc)
+add_library(im visualdl/backend/logic/im.cc)
+
+add_executable(vl_test
+        visualdl/backend/test.cc
+        visualdl/backend/logic/im_test.cc)
+target_link_libraries(vl_test storage im gtest glog protobuf gflags)
+add_executable(VisualDL ${SOURCE_FILES})
+

visualdl/backend/logic/im.cc

+#include <ctime>
+#include <glog/logging.h>
+
+#include "visualdl/backend/logic/im.h"
+
+namespace visualdl {
+
+/*
+ * @num_samples: number of instances to sample
+ * @size: counter of the records.
+ * @returns: id of the instance to replace, if drop this instance, return -1.
+ */
+int ReserviorSample(int num_samples, int num_records) {
+  if (num_records <= num_samples) {
+    return num_records;
+  }
+
+  std::srand(std::time(0));
+  float prob = static_cast<float>(std::rand()) / RAND_MAX;
+  float receive_prob = static_cast<float>(num_samples) / num_records;
+  if (prob < receive_prob) {
+    int offset2replace = std::rand() % num_samples;
+    return offset2replace;
+  }
+  return -1;
+}
+
+void InformationMaintainer::SetPersistDest(const std::string &path) {
+  CHECK(storage_.mutable_data()->dir().empty())
+      << "duplicate set storage's path";
+  storage_.mutable_data()->set_dir(path);
+}
+
+storage::Tablet *InformationMaintainer::AddTablet(const std::string &tag,
+                                                  int num_samples) {
+  auto *tablet = storage_.Find(tag);
+  if (!tablet) {
+    tablet = storage_.Add(tag, num_samples);
+  }
+  return tablet;
+}
+
+void InformationMaintainer::AddRecord(const std::string &tag,
+                                      storage::Tablet::Type type,
+                                      const std::string &data,
+                                      storage::DataType dtype) {
+  auto *tablet = storage_.Find(tag);
+  CHECK(tablet);
+
+  auto num_records = tablet->num_records();
+  const auto num_samples = tablet->num_samples();
+  const auto offset = ReserviorSample(num_samples, num_records + 1);
+  if (offset < 0)
+    return;
+
+  storage::Record *record;
+  if (offset >= num_records) {
+    record = storage_.NewRecord(tag);
+  } else {
+    record = storage_.GetRecord(tag, offset);
+  }
+
+  record->set_dtype(dtype);
+  record->ParseFromString(data);
+
+  tablet->set_num_records(num_records + 1);
+}
+
+void InformationMaintainer::PersistToDisk() {
+  CHECK(!storage_.data().dir().empty()) << "path of storage should be set";
+  storage_.Save(storage_.data().dir());
+}
+
+} // namespace visualdl

visualdl/backend/logic/im.h

+#ifndef VISUALDL_BACKEND_LOGIC_IM_H
+#define VISUALDL_BACKEND_LOGIC_IM_H
+
+#include <string>
+
+#include "visualdl/backend/storage/storage.h"
+
+namespace visualdl {
+
+/*
+ * Maintain the Storage singleton in memory, pre-compute some the statical
+ * information to help visualizaton.
+ */
+class InformationMaintainer final {
+public:
+  InformationMaintainer() {}
+
+  static InformationMaintainer &Global() {
+    static InformationMaintainer *x = new InformationMaintainer();
+    return *x;
+  }
+
+  /*
+   * Set the disk path to store the Storage object.
+   */
+  void SetPersistDest(const std::string &path);
+
+  storage::Tablet *AddTablet(const std::string &tag, int num_samples);
+
+  /*
+   * @tag: tag of the target Tablet.
+   * @type: type of target Tablet.
+   * @data: serialized protobuf message.
+   *
+   * NOTE pass in the serialized protobuf message will trigger copying, but
+   * simpler to support different Tablet data formats.
+   */
+  void AddRecord(const std::string &tag, storage::Tablet::Type type,
+                 const std::string &data,
+                 storage::DataType dtype = storage::DataType::kUnknown);
+
+  /*
+   * Save the Storage Protobuf to disk.
+   */
+  void PersistToDisk();
+
+  Storage &storage() { return storage_; }
+
+private:
+  Storage storage_;
+};
+
+} // namespace visualdl
+
+#endif // VISUALDL_BACKEND_LOGIC_IM_H

visualdl/backend/logic/im_test.cc

+#include "visualdl/backend/logic/im.h"
+
+#include "gtest/gtest.h"
+
+namespace visualdl {
+
+class ImTester : public ::testing::Test {
+protected:
+  void SetUp() override {}
+
+  InformationMaintainer &im = InformationMaintainer::Global();
+};
+
+TEST_F(ImTester, AddTablet) { im.AddTablet("tag0", 20); }
+
+TEST_F(ImTester, AddRecord) {
+  storage::Record rcd;
+  rcd.set_dtype(storage::DataType::kInt32s);
+  for (int i = 0; i < 100; i++) {
+    for (int j = 0; j < 10; j++) {
+      rcd.mutable_data()->add_i32s(i * 20 + j);
+    }
+    im.AddRecord("tag0", storage::Tablet::Type::Tablet_Type_kGraph,
+                 rcd.SerializeAsString());
+  }
+
+  ASSERT_EQ(im.storage().Find("tag0")->records_size(), 20UL);
+}
+
+} // namespace visualdl

visualdl/backend/storage/storage.cc

@@ -5,18 +5,38 @@
 
 namespace visualdl {
 
-storage::Tablet *Storage::Add(const std::string &tag) {
-  return &proto_.mutable_tablets()->at(tag);
+storage::Tablet *Storage::Add(const std::string &tag, int num_samples) {
+  auto *tablet = &(*proto_.mutable_tablets())[tag];
+  tablet->set_num_samples(num_samples);
+  return tablet;
 }
 
-const storage::Tablet *Storage::Find(const std::string &tag) const {
-  auto it = proto_.tablets().find(tag);
+storage::Tablet *Storage::Find(const std::string &tag) {
+  auto it = proto_.mutable_tablets()->find(tag);
   if (it != proto_.tablets().end()) {
     return &it->second;
   }
   return nullptr;
 }
 
+storage::Record *Storage::NewRecord(const std::string &tag) {
+  auto *tablet = Find(tag);
+  CHECK(tablet) << "Tablet" << tag << " should be create first";
+  auto *record = tablet->mutable_records()->Add();
+  // increase num_records
+  int num_records = tablet->num_records();
+  tablet->set_num_records(num_records + 1);
+  return record;
+}
+storage::Record *Storage::GetRecord(const std::string &tag, int offset) {
+  auto *tablet = Find(tag);
+  CHECK(tablet) << "Tablet" << tag << " should be create first";
+
+  auto num_records = tablet->num_records();
+  CHECK_LT(offset, num_records) << "invalid offset";
+  return tablet->mutable_records()->Mutable(offset);
+}
+
 void Storage::Save(const std::string &path) const {
   std::ofstream file(path, file.binary | file.out);
   CHECK(file.is_open()) << "can't open path " << path;
@@ -34,12 +54,10 @@ void Storage::Load(const std::string &path) {
   DeSerialize(buffer);
 }
 
-std::string Storage::Serialize() const {
-  return proto_.SerializeAsString();
-}
+std::string Storage::Serialize() const { return proto_.SerializeAsString(); }
 
 void Storage::DeSerialize(const std::string &data) {
   proto_.ParseFromString(data);
 }
 
-}  // namespace visualdl
+} // namespace visualdl

visualdl/backend/storage/storage.h

@@ -9,24 +9,33 @@
 namespace visualdl {
 
 class Storage final {
- public:
-  /*
-   * There should be only one Storage instance in memory.
-   */
-  Storage &Global() {
-    static Storage *instance = new Storage();
-    return *instance;
+public:
+  Storage() {
+    // set time stamp
+    time_t time0;
+    time(&time0);
+    proto_.set_timestamp(time0);
   }
 
   /*
    * Add a new tablet named `tag`, the newly added instance will be returned.
    */
-  storage::Tablet *Add(const std::string &tag);
+  storage::Tablet *Add(const std::string &tag, int num_samples);
 
   /*
    * Search the tablet named `tag`, if not exist, return nullptr.
    */
-  const storage::Tablet *Find(const std::string &tag) const;
+  storage::Tablet *Find(const std::string &tag);
+
+  /*
+   * Append a new record to the tail of tablet.
+   */
+  storage::Record *NewRecord(const std::string &tag);
+
+  /*
+   * Get a record at `offset`, if the offset is not valid, yield a failed CHECK.
+   */
+  storage::Record *GetRecord(const std::string &tag, int offset);
 
   /*
    * Serialize this object to string and save it to a file.
@@ -38,7 +47,11 @@ class Storage final {
    */
   void Load(const std::string &path);
 
- protected:
+  storage::Storage *mutable_data() { return &proto_; }
+
+  const storage::Storage &data() { return proto_; }
+
+protected:
   /*
    * Serialize the Storage instance to string.
    */
@@ -49,17 +62,10 @@ class Storage final {
    */
   void DeSerialize(const std::string &data);
 
-  Storage() {
-    // set time stamp
-    time_t time0;
-    time(&time0);
-    proto_.set_timestamp(time0);
-  }
-
- private:
+private:
   storage::Storage proto_;
 };
 
 } // namespace visualdl
 
-#endif //VISUALDL_STORAGE_H
+#endif // VISUALDL_STORAGE_H

visualdl/backend/storage/storage.proto

@@ -16,6 +16,8 @@ enum DataType {
     kStrings = 9;
     kInt32s = 10;
     kBools = 11;
+
+    kUnknown = 12;
 }
 
 // A data array, which type is `type`.