Scenarios (old, now called "concepts") [1005277]

// A concept should be an object, not just a string.

sclass Scenario {
  Map<Long, Concept> concepts = synchroTreeMap();
  new HashMap<Class, O> perClassData;
  S programID;
  long idCounter;
  volatile long changes = 1, changesWritten;
  volatile java.util.Timer autoSaver;
  volatile bool savingConcepts;
  
  *() { }
  *(S *programID) {}
  
  long newID() {
    do {
      ++idCounter;
    } while (hasConcept(idCounter));
    ret idCounter;
  }
  
  synchronized void loadConceptsFrom(S programID) {
    clearConcepts();
    DynamicObject_loading = true;
    try {
      readLocally2(this, programID, "concepts");
      assignConceptsToUs();
      readLocally2(this, programID, "idCounter");
    } finally {
      DynamicObject_loading = false;
    }
  }
  
  void assignConceptsToUs() {
    for (Concept c : values(concepts)) {
      c.scenario = this;
      callOpt(c, "_doneLoading2");
    }
  }
  
  synchronized void loadConcepts() {
    loadConceptsFrom(progID());
  }
  
  S progID() {
    ret programID == null ? programID() : programID;
  }
  
  Concept getConcept(S id) {
    ret empty(id) ? null : getConcept(parseLong(id));
  }
  
  Concept getConcept(long id) {
    ret (Concept) concepts.get((long) id);
  }
  
  Concept getConcept(PassRef ref) {
    ret ref == null ? null : getConcept(ref.longID());
  }
  
  bool hasConcept(long id) {
    ret concepts.containsKey((long) id);
  }
  
  void deleteConcept(long id) {
    Concept c = getConcept(id);
    if (c == null)
      print("Concept " + id + " not found");
    else
      c.delete();
  }
  
  // call in only one thread
  void saveConceptsIfDirty() {
    savingConcepts = true;
    try {
      S s;
      synchronized(main.class) {
        if (changes == changesWritten) ret;
        changesWritten = changes;
        saveLocally2(this, "idCounter");
        s = structure(cloneMap(concepts));
      }
      print("Saving " + l(s) + " chars (" + changesWritten + ")");
      saveTextFile(getProgramFile("concepts.structure"), s);
      copyFile(getProgramFile("concepts.structure"), getProgramFile("concepts.structure.backup" + ymd() + "-" + formatInt(hours(), 2)));
    } finally {
      savingConcepts = false;
    }
  }
  
  void saveConcepts() {
    saveConceptsIfDirty();
  }
  
  void clearConcepts() {
    concepts.clear();
    change();
  }
  
  synchronized void change() {
    ++changes;
  }
  
  // auto-save every second if dirty
  synchronized void autoSaveConcepts() {
    if (autoSaver == null)
      autoSaver = doEvery(1000, r { saveConcepts(); });
  }
  
  void cleanMeUp() {
    if (autoSaver != null) {
      autoSaver.cancel();
      autoSaver = null;
    }
    while (savingConcepts) sleep(10);
    saveConceptsIfDirty();
  }
  
  Map<Long, S> getIDsAndNames() {
    new Map<Long, S> map;
    Map<Long, Concept> cloned = cloneMap(concepts);
    for (long id : keys(cloned)) 
      map.put(id, cloned.get(id).className);
    ret map;
  }
  
  void deleteConcepts(L<Long> ids) {
    concepts.keySet().removeAll(ids);
  }
  
  <A extends Concept> A findBackRef(Concept c, Class<A> type) {
    ret findBackRefOfType(c, type);
  }
  
  <A extends Concept> A findBackRefOfType(Concept c, Class<A> type) {
    for (Concept.Ref r : c.backRefs)
      if (instanceOf(r.concept(), type))
        ret (A) r.concept();
    null;
  }
  
  <A extends Concept> L<A> findBackRefs(Concept c, Class<A> type) {
    new L<A> l;
    for (Concept.Ref r : c.backRefs)
      if (instanceOf(r.concept(), type))
        l.add((A) r.concept());
    ret l;
  }
  
  <A extends Concept> A conceptOfType(Class<A> type) {
    ret firstOfType(allConcepts(), type);
  }
  
  <A extends Concept> L<A> conceptsOfType(Class<A> type) {
    ret filterByType(allConcepts(), type);
  }
  
  <A extends Concept> L<A> listConcepts(Class<A> type) {
    ret conceptsOfType(type);
  }
  
  <A extends Concept> L<A> list(Class<A> type) {
    ret conceptsOfType(type);
  }
  
  L<Concept> conceptsOfType(S type) {
    ret filterByDynamicType(allConcepts(), "main$" + type);
  }
  
  bool hasConceptOfType(Class<? extends Concept> type) {
    ret hasType(allConcepts(), type);
  }
  
  void persistConcepts() {
    loadConcepts();
    autoSaveConcepts();
  }
  
  // We love synonyms
  void conceptPersistence() {
    persistConcepts();
  }
    
  // Runs r if there is no concept of that type
  <A extends Concept> A ensureHas(Class<A> c, Runnable r) {
    A a = conceptOfType(c);
    if (a == null) {
      r.run();
      a = conceptOfType(c);
      if (a == null)
        fail("Concept not made by " + r + ": " + shortClassName(c));
    }
    ret a;
  }
  
  // Ensures that every concept of type c1 is ref'd by a concept of
  // type c2.
  // Type of func: voidfunc(concept)
  void ensureHas(Class<? extends Concept> c1, Class<? extends Concept> c2, O func) {
    for (Concept a : conceptsOfType(c1)) {
      Concept b = findBackRef(a, c2);
      if (b == null) {
        callF(func, a);
        b = findBackRef(a, c2);
        if (b == null)
          fail("Concept not made by " + func + ": " + shortClassName(c2));
      }
    }
  }
  
  // Type of func: voidfunc(concept)
  void forEvery(Class<? extends Concept> type, O func) {
    for (Concept c : conceptsOfType(type))
      callF(func, c);
  }
  
  int deleteAll(Class<? extends Concept> type) {
    L<Concept> l = (L) conceptsOfType(type);
    for (Concept c : l) c.delete();
    ret l(l);
  }
  
  Collection<Concept> allConcepts() {
    synchronized(concepts) {
      ret new L(values(concepts));
    }
  }
  
  Concept cnew(S name, O... values) {
    Class<? extends Concept> cc = findClass(name);
    Concept c = cc != null ? nuObject(cc) : new Concept(name);
    csetAll(c, values);
    ret c;
  }
  
  void csetAll(Concept c, O... values) {
    for (int i = 0; i+1 < l(values); i += 2)
      cset(c, (S) values[i], values[i+1]);
  }
  
  void cset(Concept c, S field, O value) ctex {
    Field f = setOpt_findField(c.getClass(), field);
    print("cset: " + c.id + " " + field + " " + struct(value) + " " + f);
    if (value instanceof PassRef) value = getConcept((PassRef) value);
    if (f == null)
      c.fieldValues.put(field, value instanceof Concept ? c.new Ref((Concept) value) : value);
    else if (isSubtypeOf(f.getType(), Concept.Ref.class))
      ((Concept.Ref) f.get(c)).set((Concept) value);
    else
      f.set(c, value);
    change();
  }
  
  O cget(Concept c, S field) {
    O o = getOpt(c, field);
    if (o instanceof Concept.Ref) ret ((Concept.Ref) o).get();
    ret o;
  }
  
  PassRef toPassRef(Concept c) {
    ret new PassRef(c);
  }
  
  // inter-process methods
  
  PassRef xnew(S name, O... values) {
    ret new PassRef(cnew(name, values));
  }
  
  void xset(long id, S field, O value) {
    xset(new PassRef(id), field, value);
  }
  
  void xset(PassRef c, S field, O value) {
    if (value instanceof PassRef)
      value = getConcept((PassRef) value);
    cset(getConcept(c), field, value);
  }
  
  O xget(long id, S field) {
    ret xget(new PassRef(id), field);
  }
  
  O xget(PassRef c, S field) {
    ret cget(getConcept(c), field);
  }
  
  void xdelete(long id) {
    xdelete(new PassRef(id));
  }
  
  void xdelete(PassRef c) {
    getConcept(c).delete();
  }
  
  L<PassRef> xlist() {
    ret map("toPassRef", allConcepts());
  }
  
  L<PassRef> xlist(S className) {
    ret map("toPassRef", conceptsOfType(className));
  }
}

static volatile new Scenario mainScenario; // Where we create new concepts

sclass Concept extends DynamicObject {
  transient Scenario scenario; // Where we belong
  long id;
  O madeBy;
  //double energy;
  //bool defunct;
  long created;
  
  // used only internally (cnew)
  *(S className) {
    super(className);
    _created();
  }
  
  *() {
    if (!DynamicObject_loading) {
      className = shortClassName(this);
      print("New concept of type " + className);
      _created();
    }
  }
  
  new L<Ref> refs;
  new L<Ref> backRefs;

  void _created() {
    scenario = mainScenario;
    id = scenario.newID();
    created = now();
    scenario.concepts.put((long) id, this);
    scenario.change();
  }
  
  void put(S field, O value) {
    fieldValues.put(field, value);
    scenario.change();
  }
  
  O get(S field) {
    ret fieldValues.get(field);
  }
  
  class Ref<A extends Concept> {
    A value;
    
    *() {
      if (!DynamicObject_loading) refs.add(this);
    }
    
    *(A *value) {
      refs.add(this);
      index();
    }
    
    // get owning concept (source)
    Concept concept() {
      ret Concept.this;
    }
    
    // get target
    A get() {
      ret value;
    }
    
    void set(A a) {
      if (a == value) ret;
      unindex();
      value = a;
      index();
    }
    
    void set(Ref<A> ref) {
      set(ref.get());
    }
    
    void index() { 
      if (value != null)
        value.backRefs.add(this);
      scenario.change();
    }
    
    void unindex() {
      if (value != null)
        value.backRefs.remove(this);
    }
  }
  
  class RefL<A extends Concept> extends AbstractList<Concept> {
    new L<Ref<A>> l;
    
    public A set(int i, A o) {
      A prev = l.get(i).get();
      l.get(i).set(o);
      ret prev;
    }
    
    public void add(int i, A o) {
      l.add(i, new Ref(o));
    }
    
    public A get(int i) {
      ret l.get(i).get();
    }
    
    public A remove(int i) {
      ret l.remove(i).get();
    }
    
    public int size() {
      ret l.size();
    }
  }
  
  void delete() {
    scenario.concepts.remove((long) id);
    id = 0;
    //name = "[defunct " + name + "]";
    //defunct = true;
    //energy = 0;
    for (Ref r : refs)
      r.unindex();
    refs.clear();
    scenario.change();
  }
  
  BaseXRef export() {
    ret new BaseXRef(scenario.programID, id);
  }
  
  // notice system of a change in this object
  void change() {
    scenario.change();
  }
} // class Concept

// for inter-process communication
// prepared for string ids if we do them later
sclass PassRef {
  S id;
  
  *() {} // make serialisation happy
  *(long id) { this.id = str(id); }
  *(Concept c) { this(c.id); }
  long longID() { ret parseLong(id); }
  
  public S toString() {
    ret id;
  }
}

sclass Event extends Concept {}

// Reference to a concept in another program
sclass BaseXRef {
  S programID;
  long id;
    
  *() {}
  *(S *programID, long *id) {}
  
  public bool equals(O o) {
    if (!(o instanceof BaseXRef)) false;
    BaseXRef r = cast o;
    ret eq(programID, r.programID) && eq(id, r.id);
  }
  
  public int hashCode() {
    ret programID.hashCode() + (int) id;
  }
}

// BaseXRef as a concept
sclass XRef extends Concept {
  BaseXRef ref;
  
  *() {}
  *(BaseXRef *ref) { _doneLoading2(); }
  
  // after we have been added to scenario
  void _doneLoading2() {
    getIndex().put(ref, this);
  }
    
  HashMap<BaseXRef, XRef> getIndex() {
    ret getXRefIndex(scenario);
  }
}

static synchronized HashMap<BaseXRef, XRef> getXRefIndex(Scenario scenario) {
  HashMap cache = (HashMap) scenario.perClassData.get(XRef.class);
  if (cache == null)
    scenario.perClassData.put(XRef.class, cache = new HashMap);
  ret cache;
}

// uses mainScenario
static XRef lookupOrCreateXRef(BaseXRef ref) {
  XRef xref = getXRefIndex(mainScenario).get(ref);
  if (xref == null)
    xref = new XRef(ref);
  ret xref;
}

svoid loadAndAutoSaveConcepts {
  mainScenario.loadConcepts();
  mainScenario.autoSaveConcepts();
}

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Snippet ID:	#1005277
Snippet name:	Scenarios (old, now called "concepts")
Eternal ID of this version:	#1005277/2
Text MD5:	fb0fb8901c4eef87e5da57209580e32f
Author:	stefan
Category:	javax
Type:	JavaX fragment (include)
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2019-07-18 13:55:17
Source code size:	11918 bytes / 514 lines
Pitched / IR pitched:	No / No
Views / Downloads:	421 / 617
Version history:	1 change(s)
Referenced in:	[show references]

< > BotCompany Repo | #1005277 // Scenarios (old, now called "concepts")

JavaX fragment (include)

Author comment

1	// A concept should be an object, not just a string.
2
3	sclass Scenario {
4	Map<Long, Concept> concepts = synchroTreeMap();
5	new HashMap<Class, O> perClassData;
6	S programID;
7	long idCounter;
8	volatile long changes = 1, changesWritten;
9	volatile java.util.Timer autoSaver;
10	volatile bool savingConcepts;
11
12	*() { }
13	(S programID) {}
14
15	long newID() {
16	do {
17	++idCounter;
18	} while (hasConcept(idCounter));
19	ret idCounter;
20	}
21
22	synchronized void loadConceptsFrom(S programID) {
23	clearConcepts();
24	DynamicObject_loading = true;
25	try {
26	readLocally2(this, programID, "concepts");
27	assignConceptsToUs();
28	readLocally2(this, programID, "idCounter");
29	} finally {
30	DynamicObject_loading = false;
31	}
32	}
33
34	void assignConceptsToUs() {
35	for (Concept c : values(concepts)) {
36	c.scenario = this;
37	callOpt(c, "_doneLoading2");
38	}
39	}
40
41	synchronized void loadConcepts() {
42	loadConceptsFrom(progID());
43	}
44
45	S progID() {
46	ret programID == null ? programID() : programID;
47	}
48
49	Concept getConcept(S id) {
50	ret empty(id) ? null : getConcept(parseLong(id));
51	}
52
53	Concept getConcept(long id) {
54	ret (Concept) concepts.get((long) id);
55	}
56
57	Concept getConcept(PassRef ref) {
58	ret ref == null ? null : getConcept(ref.longID());
59	}
60
61	bool hasConcept(long id) {
62	ret concepts.containsKey((long) id);
63	}
64
65	void deleteConcept(long id) {
66	Concept c = getConcept(id);
67	if (c == null)
68	print("Concept " + id + " not found");
69	else
70	c.delete();
71	}
72
73	// call in only one thread
74	void saveConceptsIfDirty() {
75	savingConcepts = true;
76	try {
77	S s;
78	synchronized(main.class) {
79	if (changes == changesWritten) ret;
80	changesWritten = changes;
81	saveLocally2(this, "idCounter");
82	s = structure(cloneMap(concepts));
83	}
84	print("Saving " + l(s) + " chars (" + changesWritten + ")");
85	saveTextFile(getProgramFile("concepts.structure"), s);
86	copyFile(getProgramFile("concepts.structure"), getProgramFile("concepts.structure.backup" + ymd() + "-" + formatInt(hours(), 2)));
87	} finally {
88	savingConcepts = false;
89	}
90	}
91
92	void saveConcepts() {
93	saveConceptsIfDirty();
94	}
95
96	void clearConcepts() {
97	concepts.clear();
98	change();
99	}
100
101	synchronized void change() {
102	++changes;
103	}
104
105	// auto-save every second if dirty
106	synchronized void autoSaveConcepts() {
107	if (autoSaver == null)
108	autoSaver = doEvery(1000, r { saveConcepts(); });
109	}
110
111	void cleanMeUp() {
112	if (autoSaver != null) {
113	autoSaver.cancel();
114	autoSaver = null;
115	}
116	while (savingConcepts) sleep(10);
117	saveConceptsIfDirty();
118	}
119
120	Map<Long, S> getIDsAndNames() {
121	new Map<Long, S> map;
122	Map<Long, Concept> cloned = cloneMap(concepts);
123	for (long id : keys(cloned))
124	map.put(id, cloned.get(id).className);
125	ret map;
126	}
127
128	void deleteConcepts(L<Long> ids) {
129	concepts.keySet().removeAll(ids);
130	}
131
132	<A extends Concept> A findBackRef(Concept c, Class<A> type) {
133	ret findBackRefOfType(c, type);
134	}
135
136	<A extends Concept> A findBackRefOfType(Concept c, Class<A> type) {
137	for (Concept.Ref r : c.backRefs)
138	if (instanceOf(r.concept(), type))
139	ret (A) r.concept();
140	null;
141	}
142
143	<A extends Concept> L<A> findBackRefs(Concept c, Class<A> type) {
144	new L<A> l;
145	for (Concept.Ref r : c.backRefs)
146	if (instanceOf(r.concept(), type))
147	l.add((A) r.concept());
148	ret l;
149	}
150
151	<A extends Concept> A conceptOfType(Class<A> type) {
152	ret firstOfType(allConcepts(), type);
153	}
154
155	<A extends Concept> L<A> conceptsOfType(Class<A> type) {
156	ret filterByType(allConcepts(), type);
157	}
158
159	<A extends Concept> L<A> listConcepts(Class<A> type) {
160	ret conceptsOfType(type);
161	}
162
163	<A extends Concept> L<A> list(Class<A> type) {
164	ret conceptsOfType(type);
165	}
166
167	L<Concept> conceptsOfType(S type) {
168	ret filterByDynamicType(allConcepts(), "main$" + type);
169	}
170
171	bool hasConceptOfType(Class<? extends Concept> type) {
172	ret hasType(allConcepts(), type);
173	}
174
175	void persistConcepts() {
176	loadConcepts();
177	autoSaveConcepts();
178	}
179
180	// We love synonyms
181	void conceptPersistence() {
182	persistConcepts();
183	}
184
185	// Runs r if there is no concept of that type
186	<A extends Concept> A ensureHas(Class<A> c, Runnable r) {
187	A a = conceptOfType(c);
188	if (a == null) {
189	r.run();
190	a = conceptOfType(c);
191	if (a == null)
192	fail("Concept not made by " + r + ": " + shortClassName(c));
193	}
194	ret a;
195	}
196
197	// Ensures that every concept of type c1 is ref'd by a concept of
198	// type c2.
199	// Type of func: voidfunc(concept)
200	void ensureHas(Class<? extends Concept> c1, Class<? extends Concept> c2, O func) {
201	for (Concept a : conceptsOfType(c1)) {
202	Concept b = findBackRef(a, c2);
203	if (b == null) {
204	callF(func, a);
205	b = findBackRef(a, c2);
206	if (b == null)
207	fail("Concept not made by " + func + ": " + shortClassName(c2));
208	}
209	}
210	}
211
212	// Type of func: voidfunc(concept)
213	void forEvery(Class<? extends Concept> type, O func) {
214	for (Concept c : conceptsOfType(type))
215	callF(func, c);
216	}
217
218	int deleteAll(Class<? extends Concept> type) {
219	L<Concept> l = (L) conceptsOfType(type);
220	for (Concept c : l) c.delete();
221	ret l(l);
222	}
223
224	Collection<Concept> allConcepts() {
225	synchronized(concepts) {
226	ret new L(values(concepts));
227	}
228	}
229
230	Concept cnew(S name, O... values) {
231	Class<? extends Concept> cc = findClass(name);
232	Concept c = cc != null ? nuObject(cc) : new Concept(name);
233	csetAll(c, values);
234	ret c;
235	}
236
237	void csetAll(Concept c, O... values) {
238	for (int i = 0; i+1 < l(values); i += 2)
239	cset(c, (S) values[i], values[i+1]);
240	}
241
242	void cset(Concept c, S field, O value) ctex {
243	Field f = setOpt_findField(c.getClass(), field);
244	print("cset: " + c.id + " " + field + " " + struct(value) + " " + f);
245	if (value instanceof PassRef) value = getConcept((PassRef) value);
246	if (f == null)
247	c.fieldValues.put(field, value instanceof Concept ? c.new Ref((Concept) value) : value);
248	else if (isSubtypeOf(f.getType(), Concept.Ref.class))
249	((Concept.Ref) f.get(c)).set((Concept) value);
250	else
251	f.set(c, value);
252	change();
253	}
254
255	O cget(Concept c, S field) {
256	O o = getOpt(c, field);
257	if (o instanceof Concept.Ref) ret ((Concept.Ref) o).get();
258	ret o;
259	}
260
261	PassRef toPassRef(Concept c) {
262	ret new PassRef(c);
263	}
264
265	// inter-process methods
266
267	PassRef xnew(S name, O... values) {
268	ret new PassRef(cnew(name, values));
269	}
270
271	void xset(long id, S field, O value) {
272	xset(new PassRef(id), field, value);
273	}
274
275	void xset(PassRef c, S field, O value) {
276	if (value instanceof PassRef)
277	value = getConcept((PassRef) value);
278	cset(getConcept(c), field, value);
279	}
280
281	O xget(long id, S field) {
282	ret xget(new PassRef(id), field);
283	}
284
285	O xget(PassRef c, S field) {
286	ret cget(getConcept(c), field);
287	}
288
289	void xdelete(long id) {
290	xdelete(new PassRef(id));
291	}
292
293	void xdelete(PassRef c) {
294	getConcept(c).delete();
295	}
296
297	L<PassRef> xlist() {
298	ret map("toPassRef", allConcepts());
299	}
300
301	L<PassRef> xlist(S className) {
302	ret map("toPassRef", conceptsOfType(className));
303	}
304	}
305
306	static volatile new Scenario mainScenario; // Where we create new concepts
307
308	sclass Concept extends DynamicObject {
309	transient Scenario scenario; // Where we belong
310	long id;
311	O madeBy;
312	//double energy;
313	//bool defunct;
314	long created;
315
316	// used only internally (cnew)
317	*(S className) {
318	super(className);
319	_created();
320	}
321
322	*() {
323	if (!DynamicObject_loading) {
324	className = shortClassName(this);
325	print("New concept of type " + className);
326	_created();
327	}
328	}
329
330	new L<Ref> refs;
331	new L<Ref> backRefs;
332
333	void _created() {
334	scenario = mainScenario;
335	id = scenario.newID();
336	created = now();
337	scenario.concepts.put((long) id, this);
338	scenario.change();
339	}
340
341	void put(S field, O value) {
342	fieldValues.put(field, value);
343	scenario.change();
344	}
345
346	O get(S field) {
347	ret fieldValues.get(field);
348	}
349
350	class Ref<A extends Concept> {
351	A value;
352
353	*() {
354	if (!DynamicObject_loading) refs.add(this);
355	}
356
357	(A value) {
358	refs.add(this);
359	index();
360	}
361
362	// get owning concept (source)
363	Concept concept() {
364	ret Concept.this;
365	}
366
367	// get target
368	A get() {
369	ret value;
370	}
371
372	void set(A a) {
373	if (a == value) ret;
374	unindex();
375	value = a;
376	index();
377	}
378
379	void set(Ref<A> ref) {
380	set(ref.get());
381	}
382
383	void index() {
384	if (value != null)
385	value.backRefs.add(this);
386	scenario.change();
387	}
388
389	void unindex() {
390	if (value != null)
391	value.backRefs.remove(this);
392	}
393	}
394
395	class RefL<A extends Concept> extends AbstractList<Concept> {
396	new L<Ref<A>> l;
397
398	public A set(int i, A o) {
399	A prev = l.get(i).get();
400	l.get(i).set(o);
401	ret prev;
402	}
403
404	public void add(int i, A o) {
405	l.add(i, new Ref(o));
406	}
407
408	public A get(int i) {
409	ret l.get(i).get();
410	}
411
412	public A remove(int i) {
413	ret l.remove(i).get();
414	}
415
416	public int size() {
417	ret l.size();
418	}
419	}
420
421	void delete() {
422	scenario.concepts.remove((long) id);
423	id = 0;
424	//name = "[defunct " + name + "]";
425	//defunct = true;
426	//energy = 0;
427	for (Ref r : refs)
428	r.unindex();
429	refs.clear();
430	scenario.change();
431	}
432
433	BaseXRef export() {
434	ret new BaseXRef(scenario.programID, id);
435	}
436
437	// notice system of a change in this object
438	void change() {
439	scenario.change();
440	}
441	} // class Concept
442
443	// for inter-process communication
444	// prepared for string ids if we do them later
445	sclass PassRef {
446	S id;
447
448	*() {} // make serialisation happy
449	*(long id) { this.id = str(id); }
450	*(Concept c) { this(c.id); }
451	long longID() { ret parseLong(id); }
452
453	public S toString() {
454	ret id;
455	}
456	}
457
458	sclass Event extends Concept {}
459
460	// Reference to a concept in another program
461	sclass BaseXRef {
462	S programID;
463	long id;
464
465	*() {}
466	(S programID, long *id) {}
467
468	public bool equals(O o) {
469	if (!(o instanceof BaseXRef)) false;
470	BaseXRef r = cast o;
471	ret eq(programID, r.programID) && eq(id, r.id);
472	}
473
474	public int hashCode() {
475	ret programID.hashCode() + (int) id;
476	}
477	}
478
479	// BaseXRef as a concept
480	sclass XRef extends Concept {
481	BaseXRef ref;
482
483	*() {}
484	(BaseXRef ref) { _doneLoading2(); }
485
486	// after we have been added to scenario
487	void _doneLoading2() {
488	getIndex().put(ref, this);
489	}
490
491	HashMap<BaseXRef, XRef> getIndex() {
492	ret getXRefIndex(scenario);
493	}
494	}
495
496	static synchronized HashMap<BaseXRef, XRef> getXRefIndex(Scenario scenario) {
497	HashMap cache = (HashMap) scenario.perClassData.get(XRef.class);
498	if (cache == null)
499	scenario.perClassData.put(XRef.class, cache = new HashMap);
500	ret cache;
501	}
502
503	// uses mainScenario
504	static XRef lookupOrCreateXRef(BaseXRef ref) {
505	XRef xref = getXRefIndex(mainScenario).get(ref);
506	if (xref == null)
507	xref = new XRef(ref);
508	ret xref;
509	}
510
511	svoid loadAndAutoSaveConcepts {
512	mainScenario.loadConcepts();
513	mainScenario.autoSaveConcepts();
514	}