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#include <string>
#include <utility>
#include <vector>
#include "caffe/leveldb_database.hpp"
namespace caffe {
bool LeveldbDatabase::open(const string& filename, Mode mode) {
DLOG(INFO) << "LevelDB: Open " << filename;
leveldb::Options options;
switch (mode) {
case New:
DLOG(INFO) << " mode NEW";
options.error_if_exists = true;
options.create_if_missing = true;
read_only_ = false;
break;
case ReadWrite:
DLOG(INFO) << " mode RW";
options.error_if_exists = false;
options.create_if_missing = true;
read_only_ = false;
break;
case 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;
}
bool LeveldbDatabase::put(const key_type& key, const value_type& 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());
leveldb::Slice key_slice(key.data(), key.size());
leveldb::Slice value_slice(value.data(), value.size());
batch_->Put(key_slice, value_slice);
return true;
}
bool LeveldbDatabase::get(const key_type& key, value_type* value) {
DLOG(INFO) << "LevelDB: Get";
leveldb::Slice key_slice(key.data(), key.size());
string value_string;
leveldb::Status status =
db_->Get(leveldb::ReadOptions(), key_slice, &value_string);
if (!status.ok()) {
LOG(ERROR) << "leveldb get failed";
return false;
}
Database::value_type temp_value(value_string.data(),
value_string.data() + value_string.size());
value->swap(temp_value);
return true;
}
bool LeveldbDatabase::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();
}
void LeveldbDatabase::close() {
DLOG(INFO) << "LevelDB: Close";
batch_.reset();
db_.reset();
}
void LeveldbDatabase::keys(vector<key_type>* keys) {
DLOG(INFO) << "LevelDB: Keys";
keys->clear();
for (Database::const_iterator iter = begin(); iter != end(); ++iter) {
keys->push_back(iter->key);
}
}
LeveldbDatabase::const_iterator LeveldbDatabase::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);
}
LeveldbDatabase::const_iterator LeveldbDatabase::end() const {
shared_ptr<DatabaseState> state;
return const_iterator(this, state);
}
LeveldbDatabase::const_iterator LeveldbDatabase::cbegin() const {
return begin();
}
LeveldbDatabase::const_iterator LeveldbDatabase::cend() const { return end(); }
bool LeveldbDatabase::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;
}
void LeveldbDatabase::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();
}
}
Database::KV& LeveldbDatabase::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());
Database::key_type temp_key(key_type(iter->key().data(),
iter->key().data() + iter->key().size()));
Database::value_type temp_value(value_type(iter->value().data(),
iter->value().data() + iter->value().size()));
leveldb_state->kv_pair_.key.swap(temp_key);
leveldb_state->kv_pair_.value.swap(temp_value);
return leveldb_state->kv_pair_;
}
} // namespace caffe
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