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package imap
const maxPipeDepth = 10
type commander struct {
client *Client
pipe chan<- execution
done chan<- struct{}
}
type command interface {
execute(*connection) error
}
type execution struct {
cmd command
done chan<- error
}
func (commander *commander) execute(command command) error {
done := make(chan error)
commander.pipe <- execution{command, done}
return <-done
}
func executioner(conn *connection, pipe <-chan execution, done <-chan struct{}) {
for {
select {
case <-done:
return
case execution := <-pipe:
select { // break as soon as done is there
case <-done:
return
default:
}
err := execution.cmd.execute(conn)
execution.done <- err
}
}
}
func (client *Client) startCommander() {
if client.commander != nil {
return
}
pipe := make(chan execution, maxPipeDepth)
done := make(chan struct{})
client.commander = &commander{client, pipe, done}
for _, conn := range client.connections {
if conn != nil {
go executioner(conn, pipe, done)
}
}
}
func (client *Client) stopCommander() {
if client.commander == nil {
return
}
close(client.commander.done)
client.commander = nil
}
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