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unsubscribe.go
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unsubscribe.go
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//
// Copyright © 2011-2015 Guy M. Allard
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package stompngo
/*
Unsubscribe from a STOMP subscription.
Headers MUST contain a "destination" header key, and for Stomp 1.1+,
a "id" header key per the specifications. The subscription MUST currently
exist for this session.
Example:
// Possible additional Header keys: id.
h := stompngo.Headers{"destination", "/queue/myqueue"}
e := c.Unsubscribe(h)
if e != nil {
// Do something sane ...
}
*/
func (c *Connection) Unsubscribe(h Headers) error {
c.log(UNSUBSCRIBE, "start", h)
if !c.connected {
return ECONBAD
}
e := checkHeaders(h, c.Protocol())
if e != nil {
return e
}
//
_, okd := h.Contains("destination")
sid, oki := h.Contains("id")
if !okd && !oki {
return EREQDIUNS
}
c.subsLock.Lock()
_, p := c.subs[sid]
c.subsLock.Unlock()
switch c.Protocol() {
case SPL_12:
if !oki {
return EUNOSID
}
if !p { // subscription does not exist
return EBADSID
}
case SPL_11:
if !oki {
return EUNOSID
}
if !p { // subscription does not exist
return EBADSID
}
case SPL_10:
if !okd {
return EUNOSID
}
if oki { // User specified 'id'
if !p { // subscription does not exist
return EBADSID
}
}
default:
panic("unsubscribe version not supported")
}
e = c.transmitCommon(UNSUBSCRIBE, h) // transmitCommon Clones() the headers
if e != nil {
return e
}
if oki {
c.deleteSubscription(sid)
}
c.log(UNSUBSCRIBE, "end", h)
return nil
}
/*
Unsubscribe from an automatic STOMP subscription.
The id is the subscription ID. The subscription MUST currently exist for
this session.
*/
func (c *Connection) UnsubscribeAuto(id string) error {
c.subsLock.Lock()
_, ok := c.subs[id]
c.subsLock.Unlock()
if !ok {
return EBADSID
}
c.deleteSubscription(id)
return nil
}
/*
Delete a subscription.
*/
func (c *Connection) deleteSubscription(id string) {
c.subsLock.Lock()
close(c.subs[id])
delete(c.subs, id)
c.subsLock.Unlock()
}