Fix formatting of recent snapshot compaction fix.

Fix variable names, line lengths, namespace use, and a few other
minor issues to conform to Google C++ style guide.

PiperOrigin-RevId: 243187729

2 files changed, 135 insertions, 126 deletions

diff --git a/db/version_set.cc b/db/version_set.cc
index 7891dfc..56493ac 100644
--- a/db/version_set.cc
+++ b/db/version_set.cc
@@ -1347,78 +1347,81 @@ Compaction* VersionSet::PickCompaction() {
   return c;
 }
 
-// find the largest key in a vector of files. returns true if files it not empty
-bool FindLargestKey(const InternalKeyComparator & icmp, const std::vector<FileMetaData*> & files, InternalKey *largestKey) {
+// Finds the largest key in a vector of files. Returns true if files it not
+// empty.
+bool FindLargestKey(const InternalKeyComparator& icmp,
+                    const std::vector<FileMetaData*>& files,
+                    InternalKey* largest_key) {
   if (files.empty()) {
     return false;
   }
-  *largestKey = files[0]->largest;
+  *largest_key = files[0]->largest;
   for (size_t i = 1; i < files.size(); ++i) {
     FileMetaData* f = files[i];
-    if (icmp.Compare(f->largest, *largestKey) > 0) {
-      *largestKey = f->largest;
+    if (icmp.Compare(f->largest, *largest_key) > 0) {
+      *largest_key = f->largest;
     }
   }
   return true;
 }
 
-// find minimum file b2=(l2, u2) in level file for which l2 > u1 and user_key(l2) = user_key(u1)
-FileMetaData* FindSmallestBoundaryFile(const InternalKeyComparator & icmp,
-                                       const std::vector<FileMetaData*> & levelFiles,
-                                       const InternalKey & largestKey) {
+// Finds minimum file b2=(l2, u2) in level file for which l2 > u1 and
+// user_key(l2) = user_key(u1)
+FileMetaData* FindSmallestBoundaryFile(
+    const InternalKeyComparator& icmp,
+    const std::vector<FileMetaData*>& level_files,
+    const InternalKey& largest_key) {
   const Comparator* user_cmp = icmp.user_comparator();
-  FileMetaData* smallestBoundaryFile = NULL;
-  for (size_t i = 0; i < levelFiles.size(); ++i) {
-    FileMetaData* f = levelFiles[i];
-    if (icmp.Compare(f->smallest, largestKey) > 0 &&
-        user_cmp->Compare(f->smallest.user_key(), largestKey.user_key()) == 0) {
-      if (smallestBoundaryFile == NULL ||
-          icmp.Compare(f->smallest, smallestBoundaryFile->smallest) < 0) {
-        smallestBoundaryFile = f;
+  FileMetaData* smallest_boundary_file = nullptr;
+  for (size_t i = 0; i < level_files.size(); ++i) {
+    FileMetaData* f = level_files[i];
+    if (icmp.Compare(f->smallest, largest_key) > 0 &&
+        user_cmp->Compare(f->smallest.user_key(), largest_key.user_key()) ==
+            0) {
+      if (smallest_boundary_file == nullptr ||
+          icmp.Compare(f->smallest, smallest_boundary_file->smallest) < 0) {
+        smallest_boundary_file = f;
       }
     }
   }
-  return smallestBoundaryFile;
+  return smallest_boundary_file;
 }
 
-// If there are two blocks, b1=(l1, u1) and b2=(l2, u2) and
-// user_key(u1) = user_key(l2), and if we compact b1 but not
-// b2 then a subsequent get operation will yield an incorrect
-// result because it will return the record from b2 in level
-// i rather than from b1 because it searches level by level
-// for records matching the supplied user key.
+// Extracts the largest file b1 from |compaction_files| and then searches for a
+// b2 in |level_files| for which user_key(u1) = user_key(l2). If it finds such a
+// file b2 (known as a boundary file) it adds it to |compaction_files| and then
+// searches again using this new upper bound.
 //
-// This function extracts the largest file b1 from compactionFiles
-// and then searches for a b2 in levelFiles for which user_key(u1) =
-// user_key(l2). If it finds such a file b2 (known as a boundary file)
-// it adds it to compactionFiles and then searches again using this
-// new upper bound.
+// If there are two blocks, b1=(l1, u1) and b2=(l2, u2) and
+// user_key(u1) = user_key(l2), and if we compact b1 but not b2 then a
+// subsequent get operation will yield an incorrect result because it will
+// return the record from b2 in level i rather than from b1 because it searches
+// level by level for records matching the supplied user key.
 //
 // parameters:
-//   in     levelFiles:      list of files to search for boundary files
-//   in/out compactionFiles: list of files to extend by adding boundary files
+//   in     level_files:      List of files to search for boundary files.
+//   in/out compaction_files: List of files to extend by adding boundary files.
 void AddBoundaryInputs(const InternalKeyComparator& icmp,
-                       const std::vector<FileMetaData*>& levelFiles,
-                       std::vector<FileMetaData*>* compactionFiles) {
-  InternalKey largestKey;
+                       const std::vector<FileMetaData*>& level_files,
+                       std::vector<FileMetaData*>* compaction_files) {
+  InternalKey largest_key;
 
-  // find largestKey in compactionFiles, quick return if compactionFiles is
-  // empty
-  if (!FindLargestKey(icmp, *compactionFiles, &largestKey)) {
+  // Quick return if compaction_files is empty.
+  if (!FindLargestKey(icmp, *compaction_files, &largest_key)) {
     return;
   }
 
-  bool continueSearching = true;
-  while (continueSearching) {
-    FileMetaData* smallestBoundaryFile =
-        FindSmallestBoundaryFile(icmp, levelFiles, largestKey);
+  bool continue_searching = true;
+  while (continue_searching) {
+    FileMetaData* smallest_boundary_file =
+        FindSmallestBoundaryFile(icmp, level_files, largest_key);
 
-    // if a boundary file was found advance largestKey, otherwise we're done
-    if (smallestBoundaryFile != NULL) {
-      compactionFiles->push_back(smallestBoundaryFile);
-      largestKey = smallestBoundaryFile->largest;
+    // If a boundary file was found advance largest_key, otherwise we're done.
+    if (smallest_boundary_file != NULL) {
+      compaction_files->push_back(smallest_boundary_file);
+      largest_key = smallest_boundary_file->largest;
     } else {
-      continueSearching = false;
+      continue_searching = false;
     }
   }
 }
diff --git a/db/version_set_test.cc b/db/version_set_test.cc
index 090f115..b32e2e5 100644
--- a/db/version_set_test.cc
+++ b/db/version_set_test.cc
@@ -172,154 +172,160 @@ TEST(FindFileTest, OverlappingFiles) {
   ASSERT_TRUE(Overlaps("600", "700"));
 }
 
-void AddBoundaryInputs(const InternalKeyComparator &icmp,
-                       const std::vector<FileMetaData *> &levelFiles,
-                       std::vector<FileMetaData *> *compactionFiles);
+void AddBoundaryInputs(const InternalKeyComparator& icmp,
+                       const std::vector<FileMetaData*>& level_files,
+                       std::vector<FileMetaData*>* compaction_files);
 
 class AddBoundaryInputsTest {
  public:
-  std::vector<FileMetaData *> levelFiles_;
-  std::vector<FileMetaData *> compactionFiles_;
-  std::vector<FileMetaData *> allFiles_;
+  std::vector<FileMetaData*> level_files_;
+  std::vector<FileMetaData*> compaction_files_;
+  std::vector<FileMetaData*> all_files_;
   InternalKeyComparator icmp_;
 
   AddBoundaryInputsTest() : icmp_(BytewiseComparator()){};
 
   ~AddBoundaryInputsTest() {
-    for (size_t i = 0; i < allFiles_.size(); ++i) {
-      delete allFiles_[i];
+    for (size_t i = 0; i < all_files_.size(); ++i) {
+      delete all_files_[i];
     }
-    allFiles_.clear();
+    all_files_.clear();
   };
 
-  FileMetaData *CreateFileMetaData(uint64_t number, InternalKey smallest,
+  FileMetaData* CreateFileMetaData(uint64_t number, InternalKey smallest,
                                    InternalKey largest) {
-    FileMetaData *f = new FileMetaData();
+    FileMetaData* f = new FileMetaData();
     f->number = number;
     f->smallest = smallest;
     f->largest = largest;
-    allFiles_.push_back(f);
+    all_files_.push_back(f);
     return f;
   }
 };
 
 TEST(AddBoundaryInputsTest, TestEmptyFileSets) {
-  AddBoundaryInputs(icmp_, levelFiles_, &compactionFiles_);
-  ASSERT_TRUE(compactionFiles_.empty());
-  ASSERT_TRUE(levelFiles_.empty());
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_TRUE(compaction_files_.empty());
+  ASSERT_TRUE(level_files_.empty());
 }
 
 TEST(AddBoundaryInputsTest, TestEmptyLevelFiles) {
-  FileMetaData *f1 =
+  FileMetaData* f1 =
       CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
                          InternalKey(InternalKey("100", 1, kTypeValue)));
-  compactionFiles_.push_back(f1);
+  compaction_files_.push_back(f1);
 
-  AddBoundaryInputs(icmp_, levelFiles_, &compactionFiles_);
-  ASSERT_EQ(1, compactionFiles_.size());
-  ASSERT_EQ(f1, compactionFiles_[0]);
-  ASSERT_TRUE(levelFiles_.empty());
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(1, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_TRUE(level_files_.empty());
 }
 
 TEST(AddBoundaryInputsTest, TestEmptyCompactionFiles) {
-  FileMetaData *f1 =
+  FileMetaData* f1 =
       CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
                          InternalKey(InternalKey("100", 1, kTypeValue)));
-  levelFiles_.push_back(f1);
+  level_files_.push_back(f1);
 
-  AddBoundaryInputs(icmp_, levelFiles_, &compactionFiles_);
-  ASSERT_TRUE(compactionFiles_.empty());
-  ASSERT_EQ(1, levelFiles_.size());
-  ASSERT_EQ(f1, levelFiles_[0]);
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_TRUE(compaction_files_.empty());
+  ASSERT_EQ(1, level_files_.size());
+  ASSERT_EQ(f1, level_files_[0]);
 }
 
 TEST(AddBoundaryInputsTest, TestNoBoundaryFiles) {
-  FileMetaData *f1 =
+  FileMetaData* f1 =
       CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
                          InternalKey(InternalKey("100", 1, kTypeValue)));
-  FileMetaData *f2 =
+  FileMetaData* f2 =
       CreateFileMetaData(1, InternalKey("200", 2, kTypeValue),
                          InternalKey(InternalKey("200", 1, kTypeValue)));
-  FileMetaData *f3 =
+  FileMetaData* f3 =
       CreateFileMetaData(1, InternalKey("300", 2, kTypeValue),
                          InternalKey(InternalKey("300", 1, kTypeValue)));
 
-  levelFiles_.push_back(f3);
-  levelFiles_.push_back(f2);
-  levelFiles_.push_back(f1);
-  compactionFiles_.push_back(f2);
-  compactionFiles_.push_back(f3);
+  level_files_.push_back(f3);
+  level_files_.push_back(f2);
+  level_files_.push_back(f1);
+  compaction_files_.push_back(f2);
+  compaction_files_.push_back(f3);
 
-  AddBoundaryInputs(icmp_, levelFiles_, &compactionFiles_);
-  ASSERT_EQ(2, compactionFiles_.size());
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(2, compaction_files_.size());
 }
 
 TEST(AddBoundaryInputsTest, TestOneBoundaryFiles) {
-  FileMetaData *f1 =
+  FileMetaData* f1 =
       CreateFileMetaData(1, InternalKey("100", 3, kTypeValue),
                          InternalKey(InternalKey("100", 2, kTypeValue)));
-  FileMetaData *f2 =
+  FileMetaData* f2 =
       CreateFileMetaData(1, InternalKey("100", 1, kTypeValue),
                          InternalKey(InternalKey("200", 3, kTypeValue)));
-  FileMetaData *f3 =
+  FileMetaData* f3 =
       CreateFileMetaData(1, InternalKey("300", 2, kTypeValue),
                          InternalKey(InternalKey("300", 1, kTypeValue)));
 
-  levelFiles_.push_back(f3);
-  levelFiles_.push_back(f2);
-  levelFiles_.push_back(f1);
-  compactionFiles_.push_back(f1);
+  level_files_.push_back(f3);
+  level_files_.push_back(f2);
+  level_files_.push_back(f1);
+  compaction_files_.push_back(f1);
 
-  AddBoundaryInputs(icmp_, levelFiles_, &compactionFiles_);
-  ASSERT_EQ(2, compactionFiles_.size());
-  ASSERT_EQ(f1, compactionFiles_[0]);
-  ASSERT_EQ(f2, compactionFiles_[1]);
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(2, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_EQ(f2, compaction_files_[1]);
 }
 
 TEST(AddBoundaryInputsTest, TestTwoBoundaryFiles) {
-  FileMetaData *f1 =
+  FileMetaData* f1 =
       CreateFileMetaData(1, InternalKey("100", 6, kTypeValue),
                          InternalKey(InternalKey("100", 5, kTypeValue)));
-  FileMetaData *f2 =
+  FileMetaData* f2 =
       CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
                          InternalKey(InternalKey("300", 1, kTypeValue)));
-  FileMetaData *f3 =
+  FileMetaData* f3 =
       CreateFileMetaData(1, InternalKey("100", 4, kTypeValue),
                          InternalKey(InternalKey("100", 3, kTypeValue)));
 
-  levelFiles_.push_back(f2);
-  levelFiles_.push_back(f3);
-  levelFiles_.push_back(f1);
-  compactionFiles_.push_back(f1);
+  level_files_.push_back(f2);
+  level_files_.push_back(f3);
+  level_files_.push_back(f1);
+  compaction_files_.push_back(f1);
 
-  AddBoundaryInputs(icmp_, levelFiles_, &compactionFiles_);
-  ASSERT_EQ(3, compactionFiles_.size());
-  ASSERT_EQ(f1, compactionFiles_[0]);
-  ASSERT_EQ(f3, compactionFiles_[1]);
-  ASSERT_EQ(f2, compactionFiles_[2]);
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(3, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_EQ(f3, compaction_files_[1]);
+  ASSERT_EQ(f2, compaction_files_[2]);
 }
 
 TEST(AddBoundaryInputsTest, TestDisjoinFilePointers) {
-  FileMetaData *f1 = CreateFileMetaData(1, InternalKey("100", 6, kTypeValue), InternalKey(InternalKey("100", 5, kTypeValue)));
-  FileMetaData *f2 = CreateFileMetaData(1, InternalKey("100", 6, kTypeValue), InternalKey(InternalKey("100", 5, kTypeValue)));
-  FileMetaData *f3 = CreateFileMetaData(1, InternalKey("100", 2, kTypeValue), InternalKey(InternalKey("300", 1, kTypeValue)));
-  FileMetaData *f4 = CreateFileMetaData(1, InternalKey("100", 4, kTypeValue), InternalKey(InternalKey("100", 3, kTypeValue)));
-
-  levelFiles_.push_back(f2);
-  levelFiles_.push_back(f3);
-  levelFiles_.push_back(f4);
-
-  compactionFiles_.push_back(f1);
-
-  AddBoundaryInputs(icmp_, levelFiles_, &compactionFiles_);
-  ASSERT_EQ(3, compactionFiles_.size());
-  ASSERT_EQ(f1, compactionFiles_[0]);
-  ASSERT_EQ(f4, compactionFiles_[1]);
-  ASSERT_EQ(f3, compactionFiles_[2]);
-}
+  FileMetaData* f1 =
+      CreateFileMetaData(1, InternalKey("100", 6, kTypeValue),
+                         InternalKey(InternalKey("100", 5, kTypeValue)));
+  FileMetaData* f2 =
+      CreateFileMetaData(1, InternalKey("100", 6, kTypeValue),
+                         InternalKey(InternalKey("100", 5, kTypeValue)));
+  FileMetaData* f3 =
+      CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
+                         InternalKey(InternalKey("300", 1, kTypeValue)));
+  FileMetaData* f4 =
+      CreateFileMetaData(1, InternalKey("100", 4, kTypeValue),
+                         InternalKey(InternalKey("100", 3, kTypeValue)));
 
-} // namespace leveldb
+  level_files_.push_back(f2);
+  level_files_.push_back(f3);
+  level_files_.push_back(f4);
 
-int main(int argc, char** argv) {
-  return leveldb::test::RunAllTests();
+  compaction_files_.push_back(f1);
+
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(3, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_EQ(f4, compaction_files_[1]);
+  ASSERT_EQ(f3, compaction_files_[2]);
 }
+
+}  // namespace leveldb
+
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }