Squashed 'src/rocksdb/' content from commit 224932d

git-subtree-dir: src/rocksdb
git-subtree-split: 224932d4d0b561712107d747c662df181c39644d

util/vectorrep.cc

@@ -0,0 +1,291 @@
+//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+#ifndef ROCKSDB_LITE
+#include "rocksdb/memtablerep.h"
+
+#include <unordered_set>
+#include <set>
+#include <memory>
+#include <algorithm>
+#include <type_traits>
+
+#include "util/arena.h"
+#include "db/memtable.h"
+#include "port/port.h"
+#include "util/mutexlock.h"
+#include "util/stl_wrappers.h"
+
+namespace rocksdb {
+namespace {
+
+using namespace stl_wrappers;
+
+class VectorRep : public MemTableRep {
+ public:
+  VectorRep(const KeyComparator& compare, Arena* arena, size_t count);
+
+  // Insert key into the collection. (The caller will pack key and value into a
+  // single buffer and pass that in as the parameter to Insert)
+  // REQUIRES: nothing that compares equal to key is currently in the
+  // collection.
+  virtual void Insert(KeyHandle handle) override;
+
+  // Returns true iff an entry that compares equal to key is in the collection.
+  virtual bool Contains(const char* key) const override;
+
+  virtual void MarkReadOnly() override;
+
+  virtual size_t ApproximateMemoryUsage() override;
+
+  virtual void Get(const LookupKey& k, void* callback_args,
+                   bool (*callback_func)(void* arg,
+                                         const char* entry)) override;
+
+  virtual ~VectorRep() override { }
+
+  class Iterator : public MemTableRep::Iterator {
+    class VectorRep* vrep_;
+    std::shared_ptr<std::vector<const char*>> bucket_;
+    typename std::vector<const char*>::const_iterator mutable cit_;
+    const KeyComparator& compare_;
+    std::string tmp_;       // For passing to EncodeKey
+    bool mutable sorted_;
+    void DoSort() const;
+   public:
+    explicit Iterator(class VectorRep* vrep,
+      std::shared_ptr<std::vector<const char*>> bucket,
+      const KeyComparator& compare);
+
+    // Initialize an iterator over the specified collection.
+    // The returned iterator is not valid.
+    // explicit Iterator(const MemTableRep* collection);
+    virtual ~Iterator() override { };
+
+    // Returns true iff the iterator is positioned at a valid node.
+    virtual bool Valid() const override;
+
+    // Returns the key at the current position.
+    // REQUIRES: Valid()
+    virtual const char* key() const override;
+
+    // Advances to the next position.
+    // REQUIRES: Valid()
+    virtual void Next() override;
+
+    // Advances to the previous position.
+    // REQUIRES: Valid()
+    virtual void Prev() override;
+
+    // Advance to the first entry with a key >= target
+    virtual void Seek(const Slice& user_key, const char* memtable_key) override;
+
+    // Position at the first entry in collection.
+    // Final state of iterator is Valid() iff collection is not empty.
+    virtual void SeekToFirst() override;
+
+    // Position at the last entry in collection.
+    // Final state of iterator is Valid() iff collection is not empty.
+    virtual void SeekToLast() override;
+  };
+
+  // Return an iterator over the keys in this representation.
+  virtual MemTableRep::Iterator* GetIterator(Arena* arena) override;
+
+ private:
+  friend class Iterator;
+  typedef std::vector<const char*> Bucket;
+  std::shared_ptr<Bucket> bucket_;
+  mutable port::RWMutex rwlock_;
+  bool immutable_;
+  bool sorted_;
+  const KeyComparator& compare_;
+};
+
+void VectorRep::Insert(KeyHandle handle) {
+  auto* key = static_cast<char*>(handle);
+  assert(!Contains(key));
+  WriteLock l(&rwlock_);
+  assert(!immutable_);
+  bucket_->push_back(key);
+}
+
+// Returns true iff an entry that compares equal to key is in the collection.
+bool VectorRep::Contains(const char* key) const {
+  ReadLock l(&rwlock_);
+  return std::find(bucket_->begin(), bucket_->end(), key) != bucket_->end();
+}
+
+void VectorRep::MarkReadOnly() {
+  WriteLock l(&rwlock_);
+  immutable_ = true;
+}
+
+size_t VectorRep::ApproximateMemoryUsage() {
+  return
+    sizeof(bucket_) + sizeof(*bucket_) +
+    bucket_->size() *
+    sizeof(
+      std::remove_reference<decltype(*bucket_)>::type::value_type
+    );
+}
+
+VectorRep::VectorRep(const KeyComparator& compare, Arena* arena, size_t count)
+  : MemTableRep(arena),
+    bucket_(new Bucket()),
+    immutable_(false),
+    sorted_(false),
+    compare_(compare) { bucket_.get()->reserve(count); }
+
+VectorRep::Iterator::Iterator(class VectorRep* vrep,
+                   std::shared_ptr<std::vector<const char*>> bucket,
+                   const KeyComparator& compare)
+: vrep_(vrep),
+  bucket_(bucket),
+  cit_(bucket_->end()),
+  compare_(compare),
+  sorted_(false) { }
+
+void VectorRep::Iterator::DoSort() const {
+  // vrep is non-null means that we are working on an immutable memtable
+  if (!sorted_ && vrep_ != nullptr) {
+    WriteLock l(&vrep_->rwlock_);
+    if (!vrep_->sorted_) {
+      std::sort(bucket_->begin(), bucket_->end(), Compare(compare_));
+      cit_ = bucket_->begin();
+      vrep_->sorted_ = true;
+    }
+    sorted_ = true;
+  }
+  if (!sorted_) {
+    std::sort(bucket_->begin(), bucket_->end(), Compare(compare_));
+    cit_ = bucket_->begin();
+    sorted_ = true;
+  }
+  assert(sorted_);
+  assert(vrep_ == nullptr || vrep_->sorted_);
+}
+
+// Returns true iff the iterator is positioned at a valid node.
+bool VectorRep::Iterator::Valid() const {
+  DoSort();
+  return cit_ != bucket_->end();
+}
+
+// Returns the key at the current position.
+// REQUIRES: Valid()
+const char* VectorRep::Iterator::key() const {
+  assert(Valid());
+  return *cit_;
+}
+
+// Advances to the next position.
+// REQUIRES: Valid()
+void VectorRep::Iterator::Next() {
+  assert(Valid());
+  if (cit_ == bucket_->end()) {
+    return;
+  }
+  ++cit_;
+}
+
+// Advances to the previous position.
+// REQUIRES: Valid()
+void VectorRep::Iterator::Prev() {
+  assert(Valid());
+  if (cit_ == bucket_->begin()) {
+    // If you try to go back from the first element, the iterator should be
+    // invalidated. So we set it to past-the-end. This means that you can
+    // treat the container circularly.
+    cit_ = bucket_->end();
+  } else {
+    --cit_;
+  }
+}
+
+// Advance to the first entry with a key >= target
+void VectorRep::Iterator::Seek(const Slice& user_key,
+                               const char* memtable_key) {
+  DoSort();
+  // Do binary search to find first value not less than the target
+  const char* encoded_key =
+      (memtable_key != nullptr) ? memtable_key : EncodeKey(&tmp_, user_key);
+  cit_ = std::equal_range(bucket_->begin(),
+                          bucket_->end(),
+                          encoded_key,
+                          [this] (const char* a, const char* b) {
+                            return compare_(a, b) < 0;
+                          }).first;
+}
+
+// Position at the first entry in collection.
+// Final state of iterator is Valid() iff collection is not empty.
+void VectorRep::Iterator::SeekToFirst() {
+  DoSort();
+  cit_ = bucket_->begin();
+}
+
+// Position at the last entry in collection.
+// Final state of iterator is Valid() iff collection is not empty.
+void VectorRep::Iterator::SeekToLast() {
+  DoSort();
+  cit_ = bucket_->end();
+  if (bucket_->size() != 0) {
+    --cit_;
+  }
+}
+
+void VectorRep::Get(const LookupKey& k, void* callback_args,
+                    bool (*callback_func)(void* arg, const char* entry)) {
+  rwlock_.ReadLock();
+  VectorRep* vector_rep;
+  std::shared_ptr<Bucket> bucket;
+  if (immutable_) {
+    vector_rep = this;
+  } else {
+    vector_rep = nullptr;
+    bucket.reset(new Bucket(*bucket_));  // make a copy
+  }
+  VectorRep::Iterator iter(vector_rep, immutable_ ? bucket_ : bucket, compare_);
+  rwlock_.ReadUnlock();
+
+  for (iter.Seek(k.user_key(), k.memtable_key().data());
+       iter.Valid() && callback_func(callback_args, iter.key()); iter.Next()) {
+  }
+}
+
+MemTableRep::Iterator* VectorRep::GetIterator(Arena* arena) {
+  char* mem = nullptr;
+  if (arena != nullptr) {
+    mem = arena->AllocateAligned(sizeof(Iterator));
+  }
+  ReadLock l(&rwlock_);
+  // Do not sort here. The sorting would be done the first time
+  // a Seek is performed on the iterator.
+  if (immutable_) {
+    if (arena == nullptr) {
+      return new Iterator(this, bucket_, compare_);
+    } else {
+      return new (mem) Iterator(this, bucket_, compare_);
+    }
+  } else {
+    std::shared_ptr<Bucket> tmp;
+    tmp.reset(new Bucket(*bucket_)); // make a copy
+    if (arena == nullptr) {
+      return new Iterator(nullptr, tmp, compare_);
+    } else {
+      return new (mem) Iterator(nullptr, tmp, compare_);
+    }
+  }
+}
+} // anon namespace
+
+MemTableRep* VectorRepFactory::CreateMemTableRep(
+    const MemTableRep::KeyComparator& compare, Arena* arena,
+    const SliceTransform*, Logger* logger) {
+  return new VectorRep(compare, arena, count_);
+}
+} // namespace rocksdb
+#endif  // ROCKSDB_LITE