org.elasticsearch.common.inject.MembersInjectorStore Maven / Gradle / Ivy
/**
* Copyright (C) 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.elasticsearch.common.inject;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.elasticsearch.common.inject.internal.Errors;
import org.elasticsearch.common.inject.internal.ErrorsException;
import org.elasticsearch.common.inject.internal.FailableCache;
import org.elasticsearch.common.inject.spi.InjectionPoint;
import org.elasticsearch.common.inject.spi.TypeListenerBinding;
import java.lang.reflect.Field;
import java.util.List;
import java.util.Set;
/**
* Members injectors by type.
*
* @author [email protected] (Jesse Wilson)
*/
class MembersInjectorStore {
private final InjectorImpl injector;
private final ImmutableList typeListenerBindings;
private final FailableCache, MembersInjectorImpl> cache
= new FailableCache, MembersInjectorImpl>() {
@Override
protected MembersInjectorImpl create(TypeLiteral type, Errors errors)
throws ErrorsException {
return createWithListeners(type, errors);
}
};
MembersInjectorStore(InjectorImpl injector,
List typeListenerBindings) {
this.injector = injector;
this.typeListenerBindings = ImmutableList.copyOf(typeListenerBindings);
}
/**
* Returns true if any type listeners are installed. Other code may take shortcuts when there
* aren't any type listeners.
*/
public boolean hasTypeListeners() {
return !typeListenerBindings.isEmpty();
}
/**
* Returns a new complete members injector with injection listeners registered.
*/
@SuppressWarnings("unchecked") // the MembersInjector type always agrees with the passed type
public MembersInjectorImpl get(TypeLiteral key, Errors errors) throws ErrorsException {
return (MembersInjectorImpl) cache.get(key, errors);
}
/**
* Creates a new members injector and attaches both injection listeners and method aspects.
*/
private MembersInjectorImpl createWithListeners(TypeLiteral type, Errors errors)
throws ErrorsException {
int numErrorsBefore = errors.size();
Set injectionPoints;
try {
injectionPoints = InjectionPoint.forInstanceMethodsAndFields(type);
} catch (ConfigurationException e) {
errors.merge(e.getErrorMessages());
injectionPoints = e.getPartialValue();
}
ImmutableList injectors = getInjectors(injectionPoints, errors);
errors.throwIfNewErrors(numErrorsBefore);
EncounterImpl encounter = new EncounterImpl<>(errors, injector.lookups);
for (TypeListenerBinding typeListener : typeListenerBindings) {
if (typeListener.getTypeMatcher().matches(type)) {
try {
typeListener.getListener().hear(type, encounter);
} catch (RuntimeException e) {
errors.errorNotifyingTypeListener(typeListener, type, e);
}
}
}
encounter.invalidate();
errors.throwIfNewErrors(numErrorsBefore);
return new MembersInjectorImpl<>(injector, type, encounter, injectors);
}
/**
* Returns the injectors for the specified injection points.
*/
ImmutableList getInjectors(
Set injectionPoints, Errors errors) {
List injectors = Lists.newArrayList();
for (InjectionPoint injectionPoint : injectionPoints) {
try {
Errors errorsForMember = injectionPoint.isOptional()
? new Errors(injectionPoint)
: errors.withSource(injectionPoint);
SingleMemberInjector injector = injectionPoint.getMember() instanceof Field
? new SingleFieldInjector(this.injector, injectionPoint, errorsForMember)
: new SingleMethodInjector(this.injector, injectionPoint, errorsForMember);
injectors.add(injector);
} catch (ErrorsException ignoredForNow) {
// ignored for now
}
}
return ImmutableList.copyOf(injectors);
}
}