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d9be0757b8
Summary: Add the basic BackingStore interface, plus a NullBackingStore implementation that always returns null. This updates the ObjectStore to query the BackingStore if data is not found in the LocalStore. Additionally, this updates EdenServer to manage the BackingStore objects. It maintains a map of the BackingStore objects created for each known repository. Reviewed By: bolinfest Differential Revision: D3409602 fbshipit-source-id: 2920dc4c24ee1ec37efb542f058d0d121ceb5532
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
/*
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* Copyright (c) 2016, Facebook, Inc.
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* All rights reserved.
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*
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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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*
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*/
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#pragma once
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#include <memory>
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namespace facebook {
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namespace eden {
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class BackingStore;
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class Blob;
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class Hash;
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class LocalStore;
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class Tree;
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/**
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* ObjectStore is a content-addressed store for eden object data.
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*
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* The ObjectStore class itself is primarily a wrapper around two other
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* underlying storage types:
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* - LocalStore, which caches object data locally in a RocksDB instance
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* - BackingStore, which represents the authoritative source for the object
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* data. The BackingStore is generally more expensive to query for object
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* data, and may not be available during offline operation.
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*/
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class ObjectStore {
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public:
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ObjectStore(
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std::shared_ptr<LocalStore> localStore,
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std::shared_ptr<BackingStore> backingStore);
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virtual ~ObjectStore();
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std::unique_ptr<Tree> getTree(const Hash& id) const;
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std::unique_ptr<Blob> getBlob(const Hash& id) const;
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/**
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* Return the SHA1 hash of the blob contents.
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*
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* (Note that this is different than the Hash identifying the blob. The
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* hash identifying the blob may be computed using a separate mechanism, and
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* may not be the same as the SHA1-hash of its contents.)
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*/
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std::unique_ptr<Hash> getSha1ForBlob(const Hash& id) const;
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private:
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// Forbidden copy constructor and assignment operator
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ObjectStore(ObjectStore const&) = delete;
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ObjectStore& operator=(ObjectStore const&) = delete;
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/*
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* The LocalStore.
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*
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* Multiple ObjectStores (for different mount points) may share the same
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* LocalStore.
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*/
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std::shared_ptr<LocalStore> localStore_;
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/*
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* The BackingStore.
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*
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* Multiple ObjectStores may share the same BackingStore.
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*/
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std::shared_ptr<BackingStore> backingStore_;
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};
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}
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} // facebook::eden
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