56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
package transformer
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import (
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"io"
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"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
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oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
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)
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// AccessIdentifiers represents group of the object identifiers
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// that are returned after writing the object.
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// Consists of the ID of the stored object and the ID of the parent object.
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type AccessIdentifiers struct {
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ParentID *oid.ID
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SelfID oid.ID
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ParentHeader *object.Object
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}
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// EpochSource is a source for the current epoch.
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type EpochSource interface {
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CurrentEpoch() uint64
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}
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// ObjectTarget is an interface of the object writer.
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type ObjectTarget interface {
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// WriteHeader writes object header w/ payload part.
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// The payload of the object may be incomplete.
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//
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// Must be called exactly once. Control remains with the caller.
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// Missing a call or re-calling can lead to undefined behavior
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// that depends on the implementation.
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//
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// Must not be called after Close call.
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WriteHeader(*object.Object) error
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// Write writes object payload chunk.
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//
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// Can be called multiple times.
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//
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// Must not be called after Close call.
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io.Writer
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// Close is used to finish object writing.
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//
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// Close must return access identifiers of the object
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// that has been written.
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//
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// Must be called no more than once. Control remains with the caller.
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// Re-calling can lead to undefined behavior
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// that depends on the implementation.
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Close() (*AccessIdentifiers, error)
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}
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// TargetInitializer represents ObjectTarget constructor.
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type TargetInitializer func() ObjectTarget
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