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105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
package pubsub
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import (
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"sync"
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"code.google.com/p/go.net/context"
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)
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type PubSub struct {
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sync.Mutex
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// In-memory list of all channels being managed by the broker.
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channels map[interface{}]*Channel
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}
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// NewPubSub creates a new instance of the PubSub type
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// and returns a pointer.
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func NewPubSub() *PubSub {
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return &PubSub{
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channels: make(map[interface{}]*Channel),
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}
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}
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// Lookup performs a thread safe operation to return a pointer
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// to an existing Channel object with the given key. If the
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// Channel does not exist a nil value is returned.
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func (b *PubSub) Lookup(key interface{}) *Channel {
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b.Lock()
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defer b.Unlock()
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// find the channel in the existing list
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return b.channels[key]
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}
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// Register performs a thread safe operation to return a pointer
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// to a Channel object for the given key. The Channel is created
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// if it does not yet exist.
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func (b *PubSub) Register(key interface{}) *Channel {
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return b.RegisterOpts(key, DefaultOpts)
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}
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// Register performs a thread safe operation to return a pointer
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// to a Channel object for the given key. The Channel is created
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// if it does not yet exist using custom options.
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func (b *PubSub) RegisterOpts(key interface{}, opts *Opts) *Channel {
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b.Lock()
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defer b.Unlock()
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// find the channel in the existing list
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c, ok := b.channels[key]
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if ok {
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return c
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}
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// create the channel and register
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// with the pubsub server
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c = NewChannel(opts)
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b.channels[key] = c
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go c.start()
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return c
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}
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// Unregister performs a thread safe operation to delete the
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// Channel with the given key.
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func (b *PubSub) Unregister(key interface{}) {
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b.Lock()
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defer b.Unlock()
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// find the channel in the existing list
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c, ok := b.channels[key]
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if !ok {
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return
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}
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c.Close()
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delete(b.channels, key)
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return
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}
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// Lookup performs a thread safe operation to return a pointer
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// to an existing Channel object with the given key. If the
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// Channel does not exist a nil value is returned.
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func Lookup(c context.Context, key interface{}) *Channel {
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return FromContext(c).Lookup(key)
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}
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// Register performs a thread safe operation to return a pointer
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// to a Channel object for the given key. The Channel is created
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// if it does not yet exist.
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func Register(c context.Context, key interface{}) *Channel {
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return FromContext(c).Register(key)
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}
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// Register performs a thread safe operation to return a pointer
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// to a Channel object for the given key. The Channel is created
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// if it does not yet exist using custom options.
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func RegisterOpts(c context.Context, key interface{}, opts *Opts) *Channel {
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return FromContext(c).RegisterOpts(key, opts)
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}
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// Unregister performs a thread safe operation to delete the
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// Channel with the given key.
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func Unregister(c context.Context, key interface{}) {
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FromContext(c).Unregister(key)
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}
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