94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
package loadcontroller
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import (
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"context"
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"fmt"
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"sync"
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)
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// Prm groups the required parameters of the Controller's constructor.
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//
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// All values must comply with the requirements imposed on them.
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// Passing incorrect parameter values will result in constructor
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// failure (error or panic depending on the implementation).
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type Prm struct {
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// Iterator over the used space values of the containers
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// collected by the node locally.
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LocalMetrics IteratorProvider
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// Place of recording the local values of
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// the used space of containers.
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LocalAnnouncementTarget WriterProvider
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// Iterator over the summarized used space scores
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// from the various network participants.
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AnnouncementAccumulator IteratorProvider
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// Place of recording the final estimates of
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// the used space of containers.
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ResultReceiver WriterProvider
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}
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// Controller represents main handler for starting
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// and interrupting container volume estimation.
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//
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// It binds the interfaces of the local value stores
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// to the target storage points. Controller is abstracted
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// from the internal storage device and the network location
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// of the connecting components. At its core, it is a
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// high-level start-stop trigger for calculations.
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//
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// For correct operation, the controller must be created
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// using the constructor (New) based on the required parameters
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// and optional components. After successful creation,
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// the constructor is immediately ready to work through
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// API of external control of calculations and data transfer.
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type Controller struct {
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prm Prm
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opts *options
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announceMtx sync.Mutex
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mAnnounceCtx map[uint64]context.CancelFunc
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reportMtx sync.Mutex
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mReportCtx map[uint64]context.CancelFunc
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}
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const invalidPrmValFmt = "invalid parameter %s (%T):%v"
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func panicOnPrmValue(n string, v interface{}) {
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panic(fmt.Sprintf(invalidPrmValFmt, n, v, v))
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}
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// New creates a new instance of the Controller.
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//
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// Panics if at least one value of the parameters is invalid.
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//
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// The created Controller does not require additional
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// initialization and is completely ready for work.
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func New(prm Prm, opts ...Option) *Controller {
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switch {
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case prm.LocalMetrics == nil:
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panicOnPrmValue("LocalMetrics", prm.LocalMetrics)
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case prm.AnnouncementAccumulator == nil:
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panicOnPrmValue("AnnouncementAccumulator", prm.AnnouncementAccumulator)
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case prm.LocalAnnouncementTarget == nil:
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panicOnPrmValue("LocalAnnouncementTarget", prm.LocalAnnouncementTarget)
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case prm.ResultReceiver == nil:
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panicOnPrmValue("ResultReceiver", prm.ResultReceiver)
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}
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o := defaultOpts()
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for _, opt := range opts {
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opt(o)
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}
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return &Controller{
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prm: prm,
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opts: o,
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mAnnounceCtx: make(map[uint64]context.CancelFunc),
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mReportCtx: make(map[uint64]context.CancelFunc),
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}
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}
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