state: add machine with workers

state/machine.go

 package state
 
 import (
         "fmt"
         "labix.org/v2/mgo"
         "labix.org/v2/mgo/txn"
         "launchpad.net/juju-core/state/presence"
         "launchpad.net/juju-core/trivial"
         "strconv"
         "time"
 )
 
 // Machine represents the state of a machine.
 type Machine struct {
         st  *State
         doc machineDoc
 }
 
 // machineDoc represents the internal state of a machine in MongoDB.
 type machineDoc struct {
         Id         int `bson:"_id"`
         InstanceId string
         Principals []string
         Life       Life
         Tools      *Tools `bson:",omitempty"`
         TxnRevno   int64  `bson:"txn-revno"`
+        Workers    []WorkerKind
 }
 
 func newMachine(st *State, doc *machineDoc) *Machine {
         return &Machine{st: st, doc: *doc}
 }
 
 // Id returns the machine id.
 func (m *Machine) Id() int {
         return m.doc.Id
 }
 
 // globalKey returns the global database key for the machine.
 func (m *Machine) globalKey() string {
         return "m#" + m.String()
 }
 
 // Life returns whether the machine is Alive, Dying or Dead.
 func (m *Machine) Life() Life {
         return m.doc.Life
 }
 
+// Workers returns the workers that the machine agent is configured

[niemeyer, 2012/09/27 19:39:47]

// Workers returns the workers that the machine agent for m must run.

[rog, 2012/09/28 12:45:53]

Done.

+// to run.
+func (m *Machine) Workers() []WorkerKind {
+        return m.doc.Workers
+}
+
 // AgentTools returns the tools that the agent is currently running.
 // It returns a *NotFoundError if the tools have not yet been set.
 func (m *Machine) AgentTools() (*Tools, error) {
         if m.doc.Tools == nil {
                 return nil, notFound("agent tools for machine %v", m)
         }
         tools := *m.doc.Tools
         return &tools, nil
 }
 
@@ skipping 138 matching lines @@
                 return fmt.Errorf("cannot set instance id of machine %s: %v", m, onAbort(err, errNotAlive))
         }
         m.doc.InstanceId = id
         return nil
 }
 
 // String returns a unique description of this machine.
 func (m *Machine) String() string {
         return strconv.Itoa(m.doc.Id)
 }