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#include <string>
#include <utility>
#include <vector>
#include "caffe/caffe.hpp"
#include "caffe/leveldb_database.hpp"
namespace caffe {
template <typename K, typename V>
bool LeveldbDatabase<K, V>::open(const string& filename, Mode mode) {
DLOG(INFO) << "LevelDB: Open " << filename;
leveldb::Options options;
switch (mode) {
case Base::New:
DLOG(INFO) << " mode NEW";
options.error_if_exists = true;
options.create_if_missing = true;
read_only_ = false;
break;
case Base::ReadWrite:
DLOG(INFO) << " mode RW";
options.error_if_exists = false;
options.create_if_missing = true;
read_only_ = false;
break;
case Base::ReadOnly:
DLOG(INFO) << " mode RO";
options.error_if_exists = false;
options.create_if_missing = false;
read_only_ = true;
break;
default:
DLOG(FATAL) << "unknown mode " << mode;
}
options.write_buffer_size = 268435456;
options.max_open_files = 100;
leveldb::DB* db;
LOG(INFO) << "Opening leveldb " << filename;
leveldb::Status status = leveldb::DB::Open(
options, filename, &db);
db_.reset(db);
if (!status.ok()) {
LOG(ERROR) << "Failed to open leveldb " << filename
<< ". Is it already existing?";
return false;
}
batch_.reset(new leveldb::WriteBatch());
return true;
}
template <typename K, typename V>
bool LeveldbDatabase<K, V>::put(const K& key, const V& value) {
DLOG(INFO) << "LevelDB: Put";
if (read_only_) {
LOG(ERROR) << "put can not be used on a database in ReadOnly mode";
return false;
}
CHECK_NOTNULL(batch_.get());
string serialized_key;
if (!Base::serialize(key, &serialized_key)) {
return false;
}
string serialized_value;
if (!Base::serialize(value, &serialized_value)) {
return false;
}
batch_->Put(serialized_key, serialized_value);
return true;
}
template <typename K, typename V>
bool LeveldbDatabase<K, V>::get(const K& key, V* value) {
DLOG(INFO) << "LevelDB: Get";
string serialized_key;
if (!Base::serialize(key, &serialized_key)) {
return false;
}
string serialized_value;
leveldb::Status status =
db_->Get(leveldb::ReadOptions(), serialized_key, &serialized_value);
if (!status.ok()) {
LOG(ERROR) << "leveldb get failed";
return false;
}
if (!Base::deserialize(serialized_value, value)) {
return false;
}
return true;
}
template <typename K, typename V>
bool LeveldbDatabase<K, V>::commit() {
DLOG(INFO) << "LevelDB: Commit";
if (read_only_) {
LOG(ERROR) << "commit can not be used on a database in ReadOnly mode";
return false;
}
CHECK_NOTNULL(db_.get());
CHECK_NOTNULL(batch_.get());
leveldb::Status status = db_->Write(leveldb::WriteOptions(), batch_.get());
batch_.reset(new leveldb::WriteBatch());
return status.ok();
}
template <typename K, typename V>
void LeveldbDatabase<K, V>::close() {
DLOG(INFO) << "LevelDB: Close";
batch_.reset();
db_.reset();
}
template <typename K, typename V>
void LeveldbDatabase<K, V>::keys(vector<K>* keys) {
DLOG(INFO) << "LevelDB: Keys";
keys->clear();
for (const_iterator iter = begin(); iter != end(); ++iter) {
keys->push_back(iter->key);
}
}
template <typename K, typename V>
typename LeveldbDatabase<K, V>::const_iterator
LeveldbDatabase<K, V>::begin() const {
CHECK_NOTNULL(db_.get());
shared_ptr<leveldb::Iterator> iter(db_->NewIterator(leveldb::ReadOptions()));
iter->SeekToFirst();
if (!iter->Valid()) {
iter.reset();
}
shared_ptr<DatabaseState> state;
if (iter) {
state.reset(new LeveldbState(db_, iter));
}
return const_iterator(this, state);
}
template <typename K, typename V>
typename LeveldbDatabase<K, V>::const_iterator
LeveldbDatabase<K, V>::end() const {
shared_ptr<DatabaseState> state;
return const_iterator(this, state);
}
template <typename K, typename V>
typename LeveldbDatabase<K, V>::const_iterator
LeveldbDatabase<K, V>::cbegin() const {
return begin();
}
template <typename K, typename V>
typename LeveldbDatabase<K, V>::const_iterator
LeveldbDatabase<K, V>::cend() const { return end(); }
template <typename K, typename V>
bool LeveldbDatabase<K, V>::equal(shared_ptr<DatabaseState> state1,
shared_ptr<DatabaseState> state2) const {
shared_ptr<LeveldbState> leveldb_state1 =
boost::dynamic_pointer_cast<LeveldbState>(state1);
shared_ptr<LeveldbState> leveldb_state2 =
boost::dynamic_pointer_cast<LeveldbState>(state2);
// The KV store doesn't really have any sort of ordering,
// so while we can do a sequential scan over the collection,
// we can't really use subranges.
return !leveldb_state1 && !leveldb_state2;
}
template <typename K, typename V>
void LeveldbDatabase<K, V>::increment(shared_ptr<DatabaseState>* state) const {
shared_ptr<LeveldbState> leveldb_state =
boost::dynamic_pointer_cast<LeveldbState>(*state);
CHECK_NOTNULL(leveldb_state.get());
shared_ptr<leveldb::Iterator>& iter = leveldb_state->iter_;
CHECK_NOTNULL(iter.get());
CHECK(iter->Valid());
iter->Next();
if (!iter->Valid()) {
state->reset();
}
}
template <typename K, typename V>
typename Database<K, V>::KV& LeveldbDatabase<K, V>::dereference(
shared_ptr<DatabaseState> state) const {
shared_ptr<LeveldbState> leveldb_state =
boost::dynamic_pointer_cast<LeveldbState>(state);
CHECK_NOTNULL(leveldb_state.get());
shared_ptr<leveldb::Iterator>& iter = leveldb_state->iter_;
CHECK_NOTNULL(iter.get());
CHECK(iter->Valid());
const leveldb::Slice& key = iter->key();
const leveldb::Slice& value = iter->value();
CHECK(Base::deserialize(key.data(), key.size(),
&leveldb_state->kv_pair_.key));
CHECK(Base::deserialize(value.data(), value.size(),
&leveldb_state->kv_pair_.value));
return leveldb_state->kv_pair_;
}
INSTANTIATE_DATABASE(LeveldbDatabase);
} // namespace caffe
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