private Value encodeValue(Object value) {
if (value instanceof Actor) {
Actor actor = (Actor) value;
return new Term(REF, new Int(actor.getId()));
}
if (value instanceof Closure) {
Closure fun = (Closure) value;
return new Term(Key.getKey("Closure"), new Str(fun.getName()), new Int(fun.getArity()));
}
if (value instanceof Integer) return new Int((int) value);
if (value instanceof String) return new Str((String) value);
if (value instanceof Boolean) {
Boolean b = (Boolean) value;
if (b.booleanValue()) return new Term(Key.getKey("True"));
else return new Term(Key.getKey("False"));
}
if (value instanceof actors.Term) {
actors.Term t = (actors.Term) value;
Term term = new Term(Key.getKey(t.getName().getString()));
Value[] values = new Value[t.getValues().length];
for (int i = 0; i < values.length; i++) values[i] = encodeValue(t.getValues()[i]);
term.setValues(values);
return term;
}
return new Str("Encode value error: " + value);
}
public History getSnapshot(int time) {
// Create a snapshot of the receiver at the supplied time...
History snapshot = new History();
snapshot.startOfTime = time;
snapshot.endOfTime = time;
snapshot.behaviourChangedEvents = new Vector<BehaviourChanged>();
snapshot.consumeEvents = new Vector<Consume>();
snapshot.newActorEvents = new Vector<NewActor>();
snapshot.sendEvents = new Vector<Send>();
snapshot.stateEvents = new Hashtable<Integer, Hashtable<Key, Stack<State>>>();
for (NewActor newActor : newActorEvents) {
if (newActor.getTime() <= time) {
BehaviourChanged b = null;
for (BehaviourChanged b1 : behaviourChangedEvents) {
if (b1.getId() == newActor.getId()
&& b1.getTime() <= time
&& b1.getTime() > newActor.getTime()
&& (b == null || b1.getTime() > b.getTime())) b = b1;
}
if (b == null)
snapshot.newActorEvents.add(
new NewActor(newActor.getId(), newActor.getBehaviour(), time));
else snapshot.newActorEvents.add(new NewActor(newActor.getId(), b.getNewBehaviour(), time));
}
}
for (Consume consume : consumeEvents) {
if (consume.getTime() == time) snapshot.consumeEvents.add(consume);
}
for (Send send : sendEvents) {
if (send.getTime() == time) snapshot.sendEvents.add(send);
}
for (int id : stateEvents.keySet()) {
for (Key field : stateEvents.get(id).keySet()) {
Stack<State> stack = stateEvents.get(id).get(field);
if (!stack.isEmpty()) {
State state = stack.peek();
if (state.getTime() <= time)
snapshot.state(id, field.getString(), state.getValue(), time);
}
}
}
return snapshot;
}
static {
defRule(
Key.getKey("state"),
4,
(history, time, endOfTime, values, succ, fail) ->
HistoryPredicates.satisfyState(
history, time, endOfTime, values[0], values[1], values[2], values[3], succ, fail));
defRule(
Key.getKey("actor"),
3,
(history, time, endOfTime, values, succ, fail) ->
HistoryPredicates.satisfyActor(
history, 0, time, endOfTime, values[0], values[1], values[2], succ, fail));
defRule(
Key.getKey("send"),
4,
(history, time, endOfTime, values, succ, fail) ->
HistoryPredicates.satisfySend(
history, 0, time, endOfTime, values[0], values[1], values[2], values[3], succ,
fail));
}
public void state(int id, String name, Value value, int time) {
if (!stateEvents.containsKey(id)) stateEvents.put(id, new Hashtable<Key, Stack<State>>());
Hashtable<Key, Stack<State>> table = stateEvents.get(id);
Key key = Key.getKey(name);
if (!table.containsKey(key)) table.put(key, new Stack<State>());
Stack<State> stack = table.get(key);
if (stack.isEmpty()) stack.push(new State(id, key, value, time));
else {
State state = stack.peek();
boolean changed = false;
if (value == null && state.getValue() != null) changed = true;
if (state.getValue() == null && value != null) changed = true;
if (state.getValue() != null && value != null && !state.getValue().equals(value))
changed = true;
if (changed) {
stack.push(new State(id, key, value, time));
}
}
}
private Key[] toKeys(String[] exports) {
Key[] keys = new Key[exports.length];
for (int i = 0; i < exports.length; i++)
if (exports[i] != null) keys[i] = Key.getKey(exports[i]);
return keys;
}
public class History implements Serializable {
public static final Hashtable<Key, RuleHandler> handlers = new Hashtable<Key, RuleHandler>();
public static final Hashtable<Key, Integer> arity = new Hashtable<Key, Integer>();
public static Key REF = Key.getKey("Ref");
static {
defRule(
Key.getKey("state"),
4,
(history, time, endOfTime, values, succ, fail) ->
HistoryPredicates.satisfyState(
history, time, endOfTime, values[0], values[1], values[2], values[3], succ, fail));
defRule(
Key.getKey("actor"),
3,
(history, time, endOfTime, values, succ, fail) ->
HistoryPredicates.satisfyActor(
history, 0, time, endOfTime, values[0], values[1], values[2], succ, fail));
defRule(
Key.getKey("send"),
4,
(history, time, endOfTime, values, succ, fail) ->
HistoryPredicates.satisfySend(
history, 0, time, endOfTime, values[0], values[1], values[2], values[3], succ,
fail));
}
public static void defRule(Key name, int args, RuleHandler handler) {
handlers.put(name, handler);
arity.put(name, args);
}
public static History inflate(String path) {
FileInputStream fin;
try {
fin = new FileInputStream(path);
ObjectInputStream in = new ObjectInputStream(fin);
Object o = in.readObject();
in.close();
if (o != null && o instanceof History) {
History history = (History) o;
int b = history.behaviourChangedEvents.size();
int c = history.consumeEvents.size();
int a = history.newActorEvents.size();
int s = history.sendEvents.size();
int u = history.stateEvents.size();
System.out.println(
"[History "
+ path
+ " become="
+ b
+ " consume="
+ c
+ " actor="
+ a
+ " send="
+ s
+ " state="
+ u
+ " time=["
+ history.getStartOfTime()
+ ","
+ history.endOfTime
+ "]]");
return history;
} else throw new Error("expecting a history " + o);
} catch (IOException | ClassNotFoundException e) {
throw new Error(e.toString());
}
}
int startOfTime;
int endOfTime;
Vector<BehaviourChanged> behaviourChangedEvents = new Vector<BehaviourChanged>();
Vector<Consume> consumeEvents = new Vector<Consume>();
Vector<NewActor> newActorEvents = new Vector<NewActor>();
Vector<Send> sendEvents = new Vector<Send>();
Hashtable<Integer, Hashtable<Key, Stack<State>>> stateEvents =
new Hashtable<Integer, Hashtable<Key, Stack<State>>>();
public History() {}
public void behaviourChanged(
Actor actor, Behaviour oldBehaviour, Behaviour newBehaviour, int time) {
behaviourChangedEvents.add(
new BehaviourChanged(actor.getId(), oldBehaviour.getName(), newBehaviour.getName(), time));
}
public void consume(Actor actor, Message message) {
consumeEvents.add(new Consume(actor.getId(), encodeValue(message), Actor.getTime()));
}
private Value encodeValue(Object value) {
if (value instanceof Actor) {
Actor actor = (Actor) value;
return new Term(REF, new Int(actor.getId()));
}
if (value instanceof Closure) {
Closure fun = (Closure) value;
return new Term(Key.getKey("Closure"), new Str(fun.getName()), new Int(fun.getArity()));
}
if (value instanceof Integer) return new Int((int) value);
if (value instanceof String) return new Str((String) value);
if (value instanceof Boolean) {
Boolean b = (Boolean) value;
if (b.booleanValue()) return new Term(Key.getKey("True"));
else return new Term(Key.getKey("False"));
}
if (value instanceof actors.Term) {
actors.Term t = (actors.Term) value;
Term term = new Term(Key.getKey(t.getName().getString()));
Value[] values = new Value[t.getValues().length];
for (int i = 0; i < values.length; i++) values[i] = encodeValue(t.getValues()[i]);
term.setValues(values);
return term;
}
return new Str("Encode value error: " + value);
}
public Vector<BehaviourChanged> getBehaviourChangedEvents() {
return behaviourChangedEvents;
}
public Vector<Consume> getConsumeEvents() {
return consumeEvents;
}
public int getEndOfTime() {
return endOfTime;
}
public int getStartOfTime() {
return startOfTime;
}
public void setStartOfTime(int startOfTime) {
this.startOfTime = startOfTime;
}
public Vector<NewActor> getNewActorEvents() {
return newActorEvents;
}
public Vector<Send> getSendEvents() {
return sendEvents;
}
public boolean maybeFact(Key name, Value[] values) {
return (handlers.containsKey(name) && arity.get(name) == values.length);
}
public void newActor(Actor actor, int time) {
newActorEvents.add(new NewActor(actor.getId(), actor.getBehaviour().getName(), time));
}
public void reset() {
behaviourChangedEvents.clear();
consumeEvents.clear();
newActorEvents.clear();
sendEvents.clear();
stateEvents.clear();
}
public void satisfy(
int time, int endOfTime, Key name, Value[] values, Consumer<Fail> succ, Fail fail) {
if (handlers.containsKey(name) && arity.get(name) == values.length)
handlers.get(name).satisfy(this, time, endOfTime, values, succ, fail);
else fail.fail();
}
public void send(Actor source, Actor target, Message message, int time) {
sendEvents.add(new Send(source.getId(), target.getId(), encodeValue(message.getValue()), time));
}
public void serialize(String path) {
File file = new File(path);
OutputStream fout;
try {
fout = new FileOutputStream(file);
ObjectOutputStream out = new ObjectOutputStream(fout);
out.writeObject(this);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void setBehaviourChangedEvents(Vector<BehaviourChanged> behaviourChangedEvents) {
this.behaviourChangedEvents = behaviourChangedEvents;
}
public void setConsumeEvents(Vector<Consume> consumeEvents) {
this.consumeEvents = consumeEvents;
}
public void setEndOfTime(int endOfTime) {
this.endOfTime = endOfTime;
}
public void setNewActorEvents(Vector<NewActor> newActorEvents) {
this.newActorEvents = newActorEvents;
}
public void setSendEvents(Vector<Send> sendEvents) {
this.sendEvents = sendEvents;
}
public Hashtable<Integer, Hashtable<Key, Stack<State>>> getStateEvents() {
return stateEvents;
}
public void state(Actor a, String name, Object o, int time) {
// Record the state of the actor in the history. Note that there are
// state values that cannot be encoded in a history. These are returned
// as null from encodeValue...
Value value = encodeValue(o);
if (value != null) state(a.getId(), name, value, time);
}
public void state(int id, String name, Value value, int time) {
if (!stateEvents.containsKey(id)) stateEvents.put(id, new Hashtable<Key, Stack<State>>());
Hashtable<Key, Stack<State>> table = stateEvents.get(id);
Key key = Key.getKey(name);
if (!table.containsKey(key)) table.put(key, new Stack<State>());
Stack<State> stack = table.get(key);
if (stack.isEmpty()) stack.push(new State(id, key, value, time));
else {
State state = stack.peek();
boolean changed = false;
if (value == null && state.getValue() != null) changed = true;
if (state.getValue() == null && value != null) changed = true;
if (state.getValue() != null && value != null && !state.getValue().equals(value))
changed = true;
if (changed) {
stack.push(new State(id, key, value, time));
}
}
}
public History getSnapshot(int time) {
// Create a snapshot of the receiver at the supplied time...
History snapshot = new History();
snapshot.startOfTime = time;
snapshot.endOfTime = time;
snapshot.behaviourChangedEvents = new Vector<BehaviourChanged>();
snapshot.consumeEvents = new Vector<Consume>();
snapshot.newActorEvents = new Vector<NewActor>();
snapshot.sendEvents = new Vector<Send>();
snapshot.stateEvents = new Hashtable<Integer, Hashtable<Key, Stack<State>>>();
for (NewActor newActor : newActorEvents) {
if (newActor.getTime() <= time) {
BehaviourChanged b = null;
for (BehaviourChanged b1 : behaviourChangedEvents) {
if (b1.getId() == newActor.getId()
&& b1.getTime() <= time
&& b1.getTime() > newActor.getTime()
&& (b == null || b1.getTime() > b.getTime())) b = b1;
}
if (b == null)
snapshot.newActorEvents.add(
new NewActor(newActor.getId(), newActor.getBehaviour(), time));
else snapshot.newActorEvents.add(new NewActor(newActor.getId(), b.getNewBehaviour(), time));
}
}
for (Consume consume : consumeEvents) {
if (consume.getTime() == time) snapshot.consumeEvents.add(consume);
}
for (Send send : sendEvents) {
if (send.getTime() == time) snapshot.sendEvents.add(send);
}
for (int id : stateEvents.keySet()) {
for (Key field : stateEvents.get(id).keySet()) {
Stack<State> stack = stateEvents.get(id).get(field);
if (!stack.isEmpty()) {
State state = stack.peek();
if (state.getTime() <= time)
snapshot.state(id, field.getString(), state.getValue(), time);
}
}
}
return snapshot;
}
}