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#1306 replace anonymous lambdas (Supplier) by named classes (ValueRes…
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…olver)

it allows to log what objects were returned when debugging flaky test failures.
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@asolntsev
asolntsev committed Jul 21, 2024
1 parent 1aebeec commit a0c66fd
Showing 1 changed file with 91 additions and 48 deletions.
139 changes: 91 additions & 48 deletions src/main/java/net/datafaker/service/FakeValuesService.java
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,7 @@ public class FakeValuesService {

private static final Map<String, String[]> EXPRESSION_2_SPLITTED = new CopyOnWriteMap<>(WeakHashMap::new);

private final Map<RegExpContext, Supplier<?>> REGEXP2SUPPLIER_MAP = new CopyOnWriteMap<>(HashMap::new);
private final Map<RegExpContext, ValueResolver> REGEXP2SUPPLIER_MAP = new CopyOnWriteMap<>(HashMap::new);

public FakeValuesService() {
}
Expand Down Expand Up @@ -165,6 +165,26 @@ public String fetchString(String key, FakerContext context) {
return (String) fetch(key, context);
}

private class SafeFetchResolver implements ValueResolver {
private final String simpleDirective;
private final FakerContext context;

private SafeFetchResolver(String simpleDirective, FakerContext context) {
this.simpleDirective = simpleDirective;
this.context = context;
}

@Override
public Object resolve() {
return safeFetch(simpleDirective, context, null);
}

@Override
public String toString() {
return "%s[simpleDirective=%s, context=%s]".formatted(getClass().getSimpleName(), simpleDirective, context);
}
}

/**
* Safely fetches a key.
* <p>
Expand Down Expand Up @@ -644,10 +664,10 @@ protected String resolveExpression(String expression, Object current, ProviderRe
continue;
}
final RegExpContext regExpContext = new RegExpContext(expr, root, context);
final Supplier<?> val = REGEXP2SUPPLIER_MAP.get(regExpContext);
final ValueResolver val = REGEXP2SUPPLIER_MAP.get(regExpContext);
final Object resolved;
if (val != null) {
resolved = val.get();
resolved = val.resolve();
} else {
int j = 0;
final int length = expr.length();
Expand Down Expand Up @@ -744,21 +764,21 @@ private Object resExp(String directive, String[] args, Object current, ProviderR
Object res = resolveExpression(directive, args, current, root, context);
if (res instanceof CharSequence) {
if (((CharSequence) res).isEmpty()) {
REGEXP2SUPPLIER_MAP.put(regExpContext, () -> "");
REGEXP2SUPPLIER_MAP.put(regExpContext, EMPTY_STRING);
}
return res;
}
if (res instanceof List) {
Iterator it = ((List) res).iterator();
Iterator<ValueResolver> it = ((List) res).iterator();
while (it.hasNext()) {
Object supplier = it.next();
Object valueResolver = it.next();
Object value;
if (supplier instanceof Supplier<?>) {
value = ((Supplier<?>) supplier).get();
if (valueResolver instanceof ValueResolver resolver) {
value = resolver.resolve();
if (value == null) {
it.remove();
} else {
REGEXP2SUPPLIER_MAP.put(regExpContext, (Supplier<?>) supplier);
REGEXP2SUPPLIER_MAP.put(regExpContext, resolver);
return value;
}
}
Expand All @@ -783,22 +803,15 @@ private Object resolveExpression(String directive, String[] args, Object current
}
final int dotIndex = getDotIndex(directive);

List<Supplier<Object>> res = new ArrayList<>();
List<ValueResolver> res = new ArrayList<>();
if (args.length == 0) {
// resolve method references on CURRENT object like #{number_between '1','10'} on Number or
// #{ssn_valid} on IdNumber
if (dotIndex == -1) {
if (current instanceof AbstractProvider) {
final Method method = BaseFaker.getMethod((AbstractProvider<?>) current, directive);
if (method != null) {
res.add(() -> {
try {
return method.invoke(current);
} catch (Exception e) {
throw new RuntimeException("Failed to call method %s.%s() on %s (args: %s)".formatted(
method.getDeclaringClass().getName(), method.getName(), current, Arrays.toString(args)), e);
}
});
res.add(new MethodResolver(method, current, args));
return res;
}
}
Expand All @@ -810,14 +823,7 @@ private Object resolveExpression(String directive, String[] args, Object current
AbstractProvider<?> ap = root.getProvider(providerClassName);
Method method = ap == null ? null : ObjectMethods.getMethodByName(ap, methodName);
if (method != null) {
res.add(() -> {
try {
return method.invoke(ap);
} catch (Exception e) {
throw new RuntimeException("Failed to call method %s.%s() on %s (args: %s)".formatted(
method.getDeclaringClass().getName(), method.getName(), ap, Arrays.toString(args)), e);
}
});
res.add(new MethodResolver(method, ap, args));
return res;
}
}
Expand All @@ -830,7 +836,7 @@ private Object resolveExpression(String directive, String[] args, Object current
// car.wheel will be looked up in the YAML file.
// It's only "simple" if there aren't args
if (args.length == 0) {
res.add(() -> safeFetch(simpleDirective, context, null));
res.add(new SafeFetchResolver(simpleDirective, context));
}

// resolve method references on faker object like #{regexify '[a-z]'}
Expand All @@ -850,7 +856,7 @@ private Object resolveExpression(String directive, String[] args, Object current
// class.method_name (lowercase)
if (dotIndex >= 0) {
final String key = javaNameToYamlName(simpleDirective);
res.add(() -> safeFetch(key, context, null));
res.add(new SafeFetchResolver(key, context));
}

return res;
Expand Down Expand Up @@ -937,18 +943,18 @@ private String javaNameToYamlName(String expression) {
* {@link Name} then this method would return {@link Name#firstName()}. Returns null if the directive is nested
* (i.e. has a '.') or the method doesn't exist on the <em>obj</em> object.
*/
private Supplier<Object> resolveFromMethodOn(Object obj, String directive, String[] args) {
private ValueResolver resolveFromMethodOn(Object obj, String directive, String[] args) {
if (obj == null) {
return null;
}
try {
final MethodAndCoercedArgs accessor = retrieveMethodAccessor(obj, directive, args);
return (accessor == null)
? () -> null
: () -> invokeAndToString(accessor, obj);
? NULL_VALUE
: new MethodAndCoercedArgsResolver(accessor, obj);
} catch (Exception e) {
LOG.log(Level.FINE, "Can't call " + directive + " on " + obj, e);
return () -> null;
return NULL_VALUE;
}
}

Expand All @@ -958,7 +964,7 @@ private Supplier<Object> resolveFromMethodOn(Object obj, String directive, Strin
*
* @throws RuntimeException if there's a problem invoking the method or it doesn't exist.
*/
private Supplier<Object> resolveFakerObjectAndMethod(ProviderRegistration faker, String key, int dotIndex, String[] args) {
private ValueResolver resolveFakerObjectAndMethod(ProviderRegistration faker, String key, int dotIndex, String[] args) {
final String[] classAndMethod;
if (dotIndex == -1) {
classAndMethod = new String[]{key};
Expand All @@ -977,13 +983,12 @@ private Supplier<Object> resolveFakerObjectAndMethod(ProviderRegistration faker,
String nestedMethodName = removeUnderscoreChars(classAndMethod[1]);
final MethodAndCoercedArgs accessor = retrieveMethodAccessor(objectWithMethodToInvoke, nestedMethodName, args);
if (accessor == null) {
return () -> null;
return NULL_VALUE;
}

return () -> invokeAndToString(accessor, objectWithMethodToInvoke);
return new MethodAndCoercedArgsResolver(accessor, objectWithMethodToInvoke);
} catch (Exception e) {
LOG.fine(e.getMessage());
return () -> null;
LOG.log(Level.SEVERE, e.getMessage(), e);
return NULL_VALUE;
}
}

Expand All @@ -1010,16 +1015,6 @@ private MethodAndCoercedArgs retrieveMethodAccessor(Object object, String method
return accessor;
}

private Object invokeAndToString(MethodAndCoercedArgs accessor, Object objectWithMethodToInvoke) {
try {
return accessor.invoke(objectWithMethodToInvoke);
} catch (Exception e) {
LOG.fine(e.getMessage());
return null;
}
}


/**
* Find an accessor by name ignoring case.
*/
Expand Down Expand Up @@ -1206,4 +1201,52 @@ private Object invoke(Object on) throws InvocationTargetException, IllegalAccess

private record RegExpContext(String exp, ProviderRegistration root, FakerContext context) {
}

private interface ValueResolver {
Object resolve();
}

private record ConstantResolver(String value) implements ValueResolver {
@Override
public Object resolve() {
return value;
}
}

private static final ConstantResolver EMPTY_STRING = new ConstantResolver("");
private static final ConstantResolver NULL_VALUE = new ConstantResolver(null);

private record MethodResolver(Method method, Object current, Object[] args) implements ValueResolver {
@Override
public Object resolve() {
try {
return method.invoke(current);
} catch (Exception e) {
throw new RuntimeException("Failed to call method %s.%s() on %s (args: %s)".formatted(
method.getDeclaringClass().getName(), method.getName(), current, Arrays.toString(args)), e);
}
}

@Override
public String toString() {
return "%s[method=%s.%s(), current=%s, args=%s]".formatted(getClass().getSimpleName(),
method.getDeclaringClass().getSimpleName(), method.getName(), current, Arrays.toString(args));
}
}

private record MethodAndCoercedArgsResolver(MethodAndCoercedArgs accessor, Object obj) implements ValueResolver {
@Override
public Object resolve() {
return invokeAndToString(accessor, obj);
}

private static Object invokeAndToString(MethodAndCoercedArgs accessor, Object objectWithMethodToInvoke) {
try {
return accessor.invoke(objectWithMethodToInvoke);
} catch (Exception e) {
LOG.log(Level.FINE, e.getMessage(), e);
return null;
}
}
}
}

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