feat: finalize with step 5

chapter-2-state-driven-agent-design/westworldwithmessaging/message_dispatcher.go

@@ -1,10 +1,21 @@
 package westworldwithmessaging
 
 import (
+	"fmt"
 	"sort"
 	"sync"
 )
 
+// SendMsgImmediately and NoAdditionalInfo are the Go versions of the
+// book's "SEND_MSG_IMMEDIATELY" and "NO_ADDITIONAL_INFO" - both
+// defined as 0 in the book's MessageDispatcher.h purely so call
+// sites read clearly instead of showing a bare 0/NULL. NoAdditionalInfo
+// is nil rather than 0, since Go's nil is what an empty "any" (our
+// ExtraInfo field's type) actually looks like.
+const SendMsgImmediately = 0.0
+
+var NoAdditionalInfo any = nil
+
 // messageDispatcher is the Go version of the singleton class
 // MessageDispatcher. Same singleton pattern as everything else in
 // this package: unexported type, one shared instance, reached only
@@ -109,6 +120,9 @@ func (d *messageDispatcher) DispatchMessage(delay float64, sender int, receiver
 
 	// if there is no delay, route the telegram immediately
 	if delay <= 0.0 {
+		fmt.Printf("\nInstant telegram dispatched at time: %.5f by %s for %s. Msg is %s",
+			Clock.GetCurrentTime(), GetNameOfEntity(sender), GetNameOfEntity(receiver), GetNameOfMessage(MessageType(msg)))
+
 		// send the telegram to the recipient
 		d.discharge(pReceiver, telegram)
 	} else {
@@ -118,6 +132,9 @@ func (d *messageDispatcher) DispatchMessage(delay float64, sender int, receiver
 
 		// and put it in the queue
 		d.insertIntoPriorityQueue(telegram)
+
+		fmt.Printf("\nDelayed telegram from %s recorded at time %.5f for %s. Msg is %s",
+			GetNameOfEntity(sender), currentTime, GetNameOfEntity(receiver), GetNameOfMessage(MessageType(msg)))
 	}
 }
 
@@ -146,6 +163,9 @@ func (d *messageDispatcher) DispatchDelayedMessages() {
 		// read the telegram from the front of the queue
 		telegram := d.priorityQueue[0]
 
+		fmt.Printf("\nQueued telegram ready for dispatch: Sent to %s. Msg is %s",
+			GetNameOfEntity(telegram.Receiver), GetNameOfMessage(MessageType(telegram.Msg)))
+
 		// find the recipient
 		pReceiver := EntityMgr.GetEntityFromID(telegram.Receiver)