use of org.apache.tapestry5.plastic.InstanceContext in project tapestry-5 by apache.
the class ParameterWorker method createComputedParameterConduit.
@SuppressWarnings("all")
private ComputedValue<FieldConduit<Object>> createComputedParameterConduit(final String parameterName, final String fieldTypeName, final Parameter annotation, final MethodHandle defaultMethodHandle) {
boolean primitive = PlasticUtils.isPrimitive(fieldTypeName);
final boolean allowNull = annotation.allowNull() && !primitive;
return new ComputedValue<FieldConduit<Object>>() {
public ParameterConduit get(InstanceContext context) {
final InternalComponentResources icr = context.get(InternalComponentResources.class);
final Class fieldType = classCache.forName(fieldTypeName);
final PerThreadValue<ParameterState> stateValue = perThreadManager.createValue();
return new ParameterConduit() {
// Default value for parameter, computed *once* at
// page load time.
private Object defaultValue = classCache.defaultValueForType(fieldTypeName);
private Binding parameterBinding;
boolean loaded = false;
private boolean invariant = false;
{
// Inform the ComponentResources about the parameter conduit, so it can be
// shared with mixins.
icr.setParameterConduit(parameterName, this);
icr.getPageLifecycleCallbackHub().addPageLoadedCallback(new Runnable() {
public void run() {
load();
}
});
}
private ParameterState getState() {
ParameterState state = stateValue.get();
if (state == null) {
state = new ParameterState();
state.value = defaultValue;
stateValue.set(state);
}
return state;
}
private boolean isLoaded() {
return loaded;
}
public void set(Object instance, InstanceContext context, Object newValue) {
ParameterState state = getState();
if (!loaded) {
state.value = newValue;
defaultValue = newValue;
return;
}
// This will catch read-only or unbound parameters.
writeToBinding(newValue);
state.value = newValue;
// If caching is enabled for the parameter (the typical case) and the
// component is currently rendering, then the result
// can be cached in this ParameterConduit (until the component finishes
// rendering).
state.cached = annotation.cache() && icr.isRendering();
}
private Object readFromBinding() {
Object result;
try {
Object boundValue = parameterBinding.get();
result = typeCoercer.coerce(boundValue, fieldType);
} catch (RuntimeException ex) {
throw new TapestryException(String.format("Failure reading parameter '%s' of component %s: %s", parameterName, icr.getCompleteId(), ExceptionUtils.toMessage(ex)), parameterBinding, ex);
}
if (result == null && !allowNull) {
throw new TapestryException(String.format("Parameter '%s' of component %s is bound to null. This parameter is not allowed to be null.", parameterName, icr.getCompleteId()), parameterBinding, null);
}
return result;
}
private void writeToBinding(Object newValue) {
if (parameterBinding == null) {
return;
}
try {
Object coerced = typeCoercer.coerce(newValue, parameterBinding.getBindingType());
parameterBinding.set(coerced);
} catch (RuntimeException ex) {
throw new TapestryException(String.format("Failure writing parameter '%s' of component %s: %s", parameterName, icr.getCompleteId(), ExceptionUtils.toMessage(ex)), icr, ex);
}
}
public void reset() {
if (!invariant) {
getState().reset(defaultValue);
}
}
public void load() {
if (logger.isDebugEnabled()) {
logger.debug("{} loading parameter {}", icr.getCompleteId(), parameterName);
}
if (!icr.isBound(parameterName)) {
if (logger.isDebugEnabled()) {
logger.debug("{} parameter {} not yet bound", icr.getCompleteId(), parameterName);
}
// Otherwise, construct a default binding, or use one provided from
// the component.
Binding binding = getDefaultBindingForParameter();
if (logger.isDebugEnabled()) {
logger.debug("{} parameter {} bound to default {}", icr.getCompleteId(), parameterName, binding);
}
if (binding != null) {
icr.bindParameter(parameterName, binding);
}
}
parameterBinding = icr.getBinding(parameterName);
loaded = true;
invariant = parameterBinding != null && parameterBinding.isInvariant();
getState().value = defaultValue;
}
public boolean isBound() {
return parameterBinding != null;
}
public Object get(Object instance, InstanceContext context) {
if (!isLoaded()) {
return defaultValue;
}
ParameterState state = getState();
if (state.cached || !isBound()) {
return state.value;
}
// Read the parameter's binding and cast it to the
// field's type.
Object result = readFromBinding();
if (invariant || (annotation.cache() && icr.isRendering())) {
state.value = result;
state.cached = true;
}
return result;
}
private Binding getDefaultBindingForParameter() {
if (InternalUtils.isNonBlank(annotation.value())) {
return bindingSource.newBinding("default " + parameterName, icr, annotation.defaultPrefix(), annotation.value());
}
if (annotation.autoconnect()) {
return defaultProvider.defaultBinding(parameterName, icr);
}
// Invoke the default method and install any value or Binding returned there.
invokeDefaultMethod();
return parameterBinding;
}
private void invokeDefaultMethod() {
if (defaultMethodHandle == null) {
return;
}
if (logger.isDebugEnabled()) {
logger.debug("{} invoking method {} to obtain default for parameter {}", icr.getCompleteId(), defaultMethodHandle, parameterName);
}
MethodInvocationResult result = defaultMethodHandle.invoke(icr.getComponent());
result.rethrow();
Object defaultValue = result.getReturnValue();
if (defaultValue == null) {
return;
}
if (defaultValue instanceof Binding) {
parameterBinding = (Binding) defaultValue;
return;
}
parameterBinding = new LiteralBinding(null, "default " + parameterName, defaultValue);
}
};
}
};
}
use of org.apache.tapestry5.plastic.InstanceContext in project tapestry-5 by apache.
the class InjectContainerWorker method createFieldValueConduitProvider.
private ComputedValue<FieldConduit<Object>> createFieldValueConduitProvider(PlasticField field) {
final String fieldName = field.getName();
final String fieldTypeName = field.getTypeName();
return new ComputedValue<FieldConduit<Object>>() {
public FieldConduit<Object> get(InstanceContext context) {
final Class fieldType = cache.forName(fieldTypeName);
final ComponentResources resources = context.get(ComponentResources.class);
return new ReadOnlyComponentFieldConduit(resources, fieldName) {
public Object get(Object instance, InstanceContext context) {
Component container = resources.getContainer();
if (!fieldType.isInstance(container)) {
String message = String.format("Component %s (type %s) is not assignable to field %s.%s (of type %s).", container.getComponentResources().getCompleteId(), container.getClass().getName(), resources.getComponentModel().getComponentClassName(), fieldName, fieldTypeName);
throw new RuntimeException(message);
}
return container;
}
};
}
};
}
use of org.apache.tapestry5.plastic.InstanceContext in project tapestry-5 by apache.
the class PersistenceContextWorker method transform.
@Override
public void transform(PlasticClass plasticClass, TransformationSupport support, MutableComponentModel model) {
for (final PlasticField field : plasticClass.getFieldsWithAnnotation(PersistenceContext.class)) {
final PersistenceContext annotation = field.getAnnotation(PersistenceContext.class);
field.claim(annotation);
field.setConduit(new ReadOnlyComponentFieldConduit(plasticClass.getClassName(), field.getName()) {
@Override
public Object get(Object instance, InstanceContext context) {
return JpaInternalUtils.getEntityManager(entityManagerManager, annotation);
}
});
}
}
use of org.apache.tapestry5.plastic.InstanceContext in project tapestry-5 by apache.
the class UnclaimedFieldWorker method createComputedFieldConduit.
private ComputedValue<FieldConduit<Object>> createComputedFieldConduit(PlasticField field) {
final String fieldType = field.getTypeName();
return new ComputedValue<FieldConduit<Object>>() {
public FieldConduit<Object> get(InstanceContext context) {
Object fieldDefaultValue = classCache.defaultValueForType(fieldType);
InternalComponentResources resources = context.get(InternalComponentResources.class);
return new UnclaimedFieldConduit(resources, perThreadManager.createValue(), fieldDefaultValue);
}
};
}
use of org.apache.tapestry5.plastic.InstanceContext in project tapestry-5 by apache.
the class CachedWorker method adviseMethod.
private void adviseMethod(PlasticClass plasticClass, PlasticMethod method) {
// Every instance of the clas srequires its own per-thread value. This handles the case of multiple
// pages containing the component, or the same page containing the component multiple times.
PlasticField cacheField = plasticClass.introduceField(PerThreadValue.class, "cache$" + method.getDescription().methodName);
cacheField.injectComputed(new ComputedValue<PerThreadValue>() {
public PerThreadValue get(InstanceContext context) {
// Each instance will get a new PerThreadValue
return perThreadManager.createValue();
}
});
Cached annotation = method.getAnnotation(Cached.class);
MethodResultCacheFactory factory = createFactory(plasticClass, annotation.watch(), method);
MethodAdvice advice = createAdvice(cacheField, factory);
method.addAdvice(advice);
}
Aggregations