Snider
a6be0df3ea
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Co-authored-by: Snider <snider@host.uk.com> Co-authored-by: Virgil <virgil@lthn.ai> Reviewed-on: #38
89 lines
2 KiB
Go
89 lines
2 KiB
Go
// SPDX-License-Identifier: EUPL-1.2
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// Synchronisation, locking, and lifecycle snapshots for the Core framework.
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package core
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import (
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"sync"
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)
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// Lock is the DTO for a named mutex.
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type Lock struct {
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Name string
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Mutex *sync.RWMutex
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mu sync.Mutex // protects locks map
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locks map[string]*sync.RWMutex // per-Core named mutexes
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}
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// Lock returns a named Lock, creating the mutex if needed.
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// Locks are per-Core — separate Core instances do not share mutexes.
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func (c *Core) Lock(name string) *Lock {
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c.lock.mu.Lock()
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if c.lock.locks == nil {
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c.lock.locks = make(map[string]*sync.RWMutex)
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}
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m, ok := c.lock.locks[name]
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if !ok {
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m = &sync.RWMutex{}
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c.lock.locks[name] = m
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}
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c.lock.mu.Unlock()
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return &Lock{Name: name, Mutex: m}
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}
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// LockEnable marks that the service lock should be applied after initialisation.
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func (c *Core) LockEnable(name ...string) {
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n := "srv"
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if len(name) > 0 {
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n = name[0]
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}
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c.Lock(n).Mutex.Lock()
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defer c.Lock(n).Mutex.Unlock()
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c.services.lockEnabled = true
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}
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// LockApply activates the service lock if it was enabled.
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func (c *Core) LockApply(name ...string) {
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n := "srv"
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if len(name) > 0 {
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n = name[0]
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}
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c.Lock(n).Mutex.Lock()
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defer c.Lock(n).Mutex.Unlock()
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if c.services.lockEnabled {
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c.services.locked = true
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}
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}
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// Startables returns services that have an OnStart function.
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func (c *Core) Startables() Result {
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if c.services == nil {
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return Result{}
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}
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c.Lock("srv").Mutex.RLock()
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defer c.Lock("srv").Mutex.RUnlock()
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var out []*Service
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for _, svc := range c.services.services {
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if svc.OnStart != nil {
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out = append(out, svc)
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}
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}
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return Result{out, true}
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}
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// Stoppables returns services that have an OnStop function.
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func (c *Core) Stoppables() Result {
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if c.services == nil {
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return Result{}
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}
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c.Lock("srv").Mutex.RLock()
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defer c.Lock("srv").Mutex.RUnlock()
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var out []*Service
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for _, svc := range c.services.services {
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if svc.OnStop != nil {
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out = append(out, svc)
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}
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}
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return Result{out, true}
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}
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