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71 lines
2.4 KiB
Go
71 lines
2.4 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package raw
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import (
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"code.google.com/p/goprotobuf/proto"
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"github.com/prometheus/prometheus/storage"
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)
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type ForEacher interface {
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// ForEach is responsible for iterating through all records in the database
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// until one of the following conditions are met:
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//
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// 1.) A system anomaly in the database scan.
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// 2.) The last record in the database is reached.
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// 3.) A FilterResult of STOP is emitted by the Filter.
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//
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// Decoding errors for an entity cause that entity to be skipped.
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ForEach(storage.RecordDecoder, storage.RecordFilter, storage.RecordOperator) (scannedEntireCorpus bool, err error)
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}
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// Persistence models a key-value store for bytes that supports various
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// additional operations.
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type Persistence interface {
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ForEacher
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// Close reaps all of the underlying system resources associated with this
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// persistence.
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Close()
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// Has informs the user whether a given key exists in the database.
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Has(key proto.Message) (bool, error)
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// Get retrieves the key from the database if it exists or returns nil if
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// it is absent.
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Get(key, value proto.Message) (present bool, err error)
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// Drop removes the key from the database.
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Drop(key proto.Message) error
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// Put sets the key to a given value.
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Put(key, value proto.Message) error
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// Commit applies the Batch operations to the database.
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Commit(Batch) error
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}
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// Batch models a pool of mutations for the database that can be committed
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// en masse. The interface implies no protocol around the atomicity of
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// effectuation.
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type Batch interface {
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// Close reaps all of the underlying system resources associated with this
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// batch mutation.
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Close()
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// Put follows the same protocol as Persistence.Put.
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Put(key, value proto.Message)
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// Drop follows the same protocol as Persistence.Drop.
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Drop(key proto.Message)
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}
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type Pruner interface {
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Prune() (noop bool, err error)
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}
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