88 lines
2.9 KiB
Go
88 lines
2.9 KiB
Go
package loadcontroller
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import (
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"context"
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"io"
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"github.com/nspcc-dev/neofs-api-go/pkg/container"
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)
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// UsedSpaceHandler describes the signature of the UsedSpaceAnnouncement
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// value handling function.
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//
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// Termination of processing without failures is usually signaled
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// with a zero error, while a specific value may describe the reason
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// for failure.
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type UsedSpaceHandler func(container.UsedSpaceAnnouncement) error
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// UsedSpaceFilter describes the signature of the function for
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// checking whether a value meets a certain criterion.
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//
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// Return of true means conformity, false - vice versa.
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type UsedSpaceFilter func(container.UsedSpaceAnnouncement) bool
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// Iterator is a group of methods provided by entity
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// which can iterate over a group of UsedSpaceAnnouncement values.
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type Iterator interface {
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// Iterate must start an iterator over values that
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// meet the filter criterion (returns true).
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// For each such value should call a handler, the error
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// of which should be directly returned from the method.
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//
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// Internal failures of the iterator are also signaled via
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// an error. After a successful call to the last value
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// handler, nil should be returned.
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Iterate(UsedSpaceFilter, UsedSpaceHandler) error
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}
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// IteratorProvider is a group of methods provided
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// by entity which generates iterators over
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// UsedSpaceAnnouncement values.
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type IteratorProvider interface {
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// InitIterator should return an initialized Iterator.
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//
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// Initialization problems are reported via error.
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// If no error was returned, then the Iterator must not be nil.
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//
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// Implementations can have different logic for different
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// contexts, so specific ones may document their own behavior.
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InitIterator(context.Context) (Iterator, error)
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}
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// Writer describes the interface for storing UsedSpaceAnnouncement values.
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//
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// This interface is provided by both local storage
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// of values and remote (wrappers over the RPC).
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type Writer interface {
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// Put performs a write operation of UsedSpaceAnnouncement value
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// and returns any error encountered.
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//
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// All values after the Close call must be flushed to the
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// physical target. Implementations can cache values before
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// Close operation.
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//
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// Put must not be called after Close.
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Put(container.UsedSpaceAnnouncement) error
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// Close exits with method-providing Writer.
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//
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// All cached values must be flushed before
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// the Close's return.
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//
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// Methods must not be called after Close.
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io.Closer
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}
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// WriterProvider is a group of methods provided
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// by entity which generates keepers of
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// UsedSpaceAnnouncement values.
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type WriterProvider interface {
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// InitWriter should return an initialized Writer.
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//
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// Initialization problems are reported via error.
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// If no error was returned, then the Writer must not be nil.
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//
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// Implementations can have different logic for different
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// contexts, so specific ones may document their own behavior.
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InitWriter(context.Context) (Writer, error)
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}
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