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cfcf045acc
Summary: The ObjectRegistry class replaces the Registrar and NewCustomObjects. Objects are registered with the registry by Type (the class must implement the static const char *Type() method). This change is necessary for a few reasons: - By having a class (rather than static template instances), the class can be passed between compilation units, meaning that objects could be registered and shared from a dynamic library with an executable. - By having a class with instances, different units could have different objects registered. This could be useful if, for example, one Option allowed for a dynamic library and one did not. When combined with some other PRs (being able to load shared libraries, a Configurable interface to configure objects to/from string), this code will allow objects in external shared libraries to be added to a RocksDB image at run-time, rather than requiring every new extension to be built into the main library and called explicitly by every program. Test plan (on riversand963's devserver) ``` $COMPILE_WITH_ASAN=1 make -j32 all && sleep 1 && make check ``` All tests pass. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5293 Differential Revision: D16363396 Pulled By: riversand963 fbshipit-source-id: fbe4acb615bfc11103eef40a0b288845791c0180
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "rocksdb/utilities/object_registry.h"
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#include "logging/logging.h"
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#include "rocksdb/env.h"
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namespace rocksdb {
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#ifndef ROCKSDB_LITE
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// Looks through the "type" factories for one that matches "name".
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// If found, returns the pointer to the Entry matching this name.
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// Otherwise, nullptr is returned
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const ObjectLibrary::Entry *ObjectLibrary::FindEntry(
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const std::string &type, const std::string &name) const {
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auto entries = entries_.find(type);
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if (entries != entries_.end()) {
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for (const auto &entry : entries->second) {
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if (entry->matches(name)) {
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return entry.get();
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}
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}
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}
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return nullptr;
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}
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void ObjectLibrary::AddEntry(const std::string &type,
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std::unique_ptr<Entry> &entry) {
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auto &entries = entries_[type];
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entries.emplace_back(std::move(entry));
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}
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void ObjectLibrary::Dump(Logger *logger) const {
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for (const auto &iter : entries_) {
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ROCKS_LOG_HEADER(logger, " Registered factories for type[%s] ",
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iter.first.c_str());
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bool printed_one = false;
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for (const auto &e : iter.second) {
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ROCKS_LOG_HEADER(logger, "%c %s", (printed_one) ? ',' : ':',
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e->Name().c_str());
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printed_one = true;
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}
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}
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ROCKS_LOG_HEADER(logger, "\n");
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}
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// Returns the Default singleton instance of the ObjectLibrary
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// This instance will contain most of the "standard" registered objects
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std::shared_ptr<ObjectLibrary> &ObjectLibrary::Default() {
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static std::shared_ptr<ObjectLibrary> instance =
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std::make_shared<ObjectLibrary>();
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return instance;
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}
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std::shared_ptr<ObjectRegistry> ObjectRegistry::NewInstance() {
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std::shared_ptr<ObjectRegistry> instance = std::make_shared<ObjectRegistry>();
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return instance;
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}
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ObjectRegistry::ObjectRegistry() {
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libraries_.push_back(ObjectLibrary::Default());
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}
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// Searches (from back to front) the libraries looking for the
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// an entry that matches this pattern.
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// Returns the entry if it is found, and nullptr otherwise
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const ObjectLibrary::Entry *ObjectRegistry::FindEntry(
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const std::string &type, const std::string &name) const {
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for (auto iter = libraries_.crbegin(); iter != libraries_.crend(); ++iter) {
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const auto *entry = iter->get()->FindEntry(type, name);
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if (entry != nullptr) {
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return entry;
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}
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}
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return nullptr;
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}
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void ObjectRegistry::Dump(Logger *logger) const {
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for (auto iter = libraries_.crbegin(); iter != libraries_.crend(); ++iter) {
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iter->get()->Dump(logger);
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}
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}
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#endif // ROCKSDB_LITE
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} // namespace rocksdb
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