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507b881c21
In order to allow tools like shove to correctly address named DataStores, we need to have the notion of a name be settable at the DataStoreFlags level. Once we've done that, it doesn't really make sense to have API surface for creating DataStores without a name -- though for compatibility, the code will continue to accept an empty string for a DataStore's name
44 lines
1.4 KiB
Go
44 lines
1.4 KiB
Go
package chunks
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import (
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"io"
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"github.com/attic-labs/noms/ref"
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)
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// ChunkStore is the core storage abstraction in noms. We can put data anyplace we have a ChunkStore implementation for.
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type ChunkStore interface {
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ChunkSource
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ChunkSink
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RootTracker
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}
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// Factory allows the creation of namespaced ChunkStore instances. The details of how namespaces are separated is left up to the particular implementation of Factory and ChunkStore.
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type Factory interface {
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CreateStore(ns string) ChunkStore
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// Shutter shuts down the factory. Subsequent calls to CreateStore() will fail.
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Shutter()
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}
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// RootTracker allows querying and management of the root of an entire tree of references. The "root" is the single mutable variable in a ChunkStore. It can store any ref, but it is typically used by higher layers (such as DataStore) to store a ref to a value that represents the current state and entire history of a datastore.
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type RootTracker interface {
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Root() ref.Ref
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UpdateRoot(current, last ref.Ref) bool
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}
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// ChunkSource is a place to get chunks from.
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type ChunkSource interface {
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// Get gets a reader for the value of the Ref in the store. If the ref is absent from the store nil is returned.
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Get(ref ref.Ref) Chunk
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// Returns true iff the value at the address |ref| is contained in the source
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Has(ref ref.Ref) bool
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}
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// ChunkSink is a place to put chunks.
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type ChunkSink interface {
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Put(c Chunk)
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io.Closer
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}
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