75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
package runner
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import (
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"sync"
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)
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// Storage is an interface for storing runners.
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type Storage interface {
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// Add adds an runner to the storage.
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// It overwrites the old runner if one with the same id was already stored.
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Add(Runner)
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// Get returns a runner from the storage.
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// Iff the runner does not exist in the storage, ok will be false.
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Get(id string) (r Runner, ok bool)
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// Delete deletes the runner with the passed id from the storage. It does nothing if no runner with the id is present in the store.
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Delete(id string)
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// Length returns the number of currently stored runners in the storage.
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Length() int
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// Sample returns and removes an arbitrary runner from the storage.
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// ok is true iff a runner was returned.
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Sample() (r Runner, ok bool)
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}
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// localRunnerStorage stores runner objects in the local application memory.
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// ToDo: Create implementation that use some persistent storage like a database
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type localRunnerStorage struct {
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sync.RWMutex
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runners map[string]Runner
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}
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// NewLocalRunnerStorage responds with a Storage implementation.
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// This implementation stores the data thread-safe in the local application memory
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func NewLocalRunnerStorage() *localRunnerStorage {
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return &localRunnerStorage{
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runners: make(map[string]Runner),
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}
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}
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func (s *localRunnerStorage) Add(r Runner) {
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s.Lock()
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defer s.Unlock()
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s.runners[r.Id()] = r
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}
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func (s *localRunnerStorage) Get(id string) (r Runner, ok bool) {
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s.RLock()
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defer s.RUnlock()
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r, ok = s.runners[id]
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return
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}
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func (s *localRunnerStorage) Delete(id string) {
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s.Lock()
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defer s.Unlock()
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delete(s.runners, id)
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}
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func (s *localRunnerStorage) Sample() (Runner, bool) {
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s.Lock()
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defer s.Unlock()
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for _, runner := range s.runners {
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delete(s.runners, runner.Id())
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return runner, true
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}
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return nil, false
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}
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func (s *localRunnerStorage) Length() int {
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return len(s.runners)
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}
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