fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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45 lines
1.4 KiB
45 lines
1.4 KiB
// Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#ifndef ROCKSDB_LITE
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#include <functional>
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#include <memory>
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#include <string>
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#include "rocksdb/env.h"
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namespace rocksdb {
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// Returns a new Env when called with a URI string. Populates the unique_ptr
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// argument if granting ownership to caller.
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typedef std::function<Env*(const std::string&, std::unique_ptr<Env>*)>
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EnvFactoryFunc;
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// Creates a new Env using the registered factory function corresponding to a
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// prefix of uri.
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//
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// If no prefixes match, returns nullptr. If multiple prefixes match, the
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// factory function used is unspecified.
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//
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// Populates env_guard with result pointer if caller is granted ownership.
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Env* NewEnvFromUri(const std::string& uri, std::unique_ptr<Env>* env_guard);
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// To register an Env factory function, initialize an EnvRegistrar object with
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// static storage duration. For example:
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//
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// static EnvRegistrar hdfs_reg("hdfs://", &CreateHdfsEnv);
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//
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// Then, calling NewEnvFromUri("hdfs://some_path", ...) will use CreateHdfsEnv
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// to make a new Env.
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class EnvRegistrar {
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public:
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explicit EnvRegistrar(std::string uri_prefix, EnvFactoryFunc env_factory);
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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