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org.elasticsearch.common.inject.spi.Elements Maven / Gradle / Ivy
/**
* Copyright (C) 2008 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.spi;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.elasticsearch.bootstrap.Bootstrap;
import org.elasticsearch.common.inject.*;
import org.elasticsearch.common.inject.binder.AnnotatedBindingBuilder;
import org.elasticsearch.common.inject.binder.AnnotatedConstantBindingBuilder;
import org.elasticsearch.common.inject.binder.AnnotatedElementBuilder;
import org.elasticsearch.common.inject.internal.*;
import org.elasticsearch.common.inject.matcher.Matcher;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import java.lang.annotation.Annotation;
import java.util.*;
import static com.google.common.base.Preconditions.checkArgument;
/**
* Exposes elements of a module so they can be inspected, validated or {@link
* Element#applyTo(Binder) rewritten}.
*
* @author [email protected] (Jesse Wilson)
* @since 2.0
*/
public final class Elements {
private static final BindingTargetVisitor GET_INSTANCE_VISITOR
= new DefaultBindingTargetVisitor() {
@Override
public Object visit(InstanceBinding binding) {
return binding.getInstance();
}
@Override
protected Object visitOther(Binding binding) {
throw new IllegalArgumentException();
}
};
/**
* Records the elements executed by {@code modules}.
*/
public static List getElements(Module... modules) {
return getElements(Stage.DEVELOPMENT, Arrays.asList(modules));
}
/**
* Records the elements executed by {@code modules}.
*/
public static List getElements(Stage stage, Module... modules) {
return getElements(stage, Arrays.asList(modules));
}
/**
* Records the elements executed by {@code modules}.
*/
public static List getElements(Iterable modules) {
return getElements(Stage.DEVELOPMENT, modules);
}
/**
* Records the elements executed by {@code modules}.
*/
public static List getElements(Stage stage, Iterable modules) {
RecordingBinder binder = new RecordingBinder(stage);
for (Module module : modules) {
binder.install(module);
}
return Collections.unmodifiableList(binder.elements);
}
/**
* Returns the module composed of {@code elements}.
*/
public static Module getModule(final Iterable elements) {
return new Module() {
public void configure(Binder binder) {
for (Element element : elements) {
element.applyTo(binder);
}
}
};
}
@SuppressWarnings("unchecked")
static BindingTargetVisitor getInstanceVisitor() {
return (BindingTargetVisitor) GET_INSTANCE_VISITOR;
}
private static class RecordingBinder implements Binder, PrivateBinder {
private final Stage stage;
private final Set modules;
private final List elements;
private final Object source;
private final SourceProvider sourceProvider;
/**
* The binder where exposed bindings will be created
*/
private final RecordingBinder parent;
private final PrivateElementsImpl privateElements;
private RecordingBinder(Stage stage) {
this.stage = stage;
this.modules = Sets.newHashSet();
this.elements = Lists.newArrayList();
this.source = null;
this.sourceProvider = new SourceProvider().plusSkippedClasses(
Elements.class, RecordingBinder.class, AbstractModule.class,
ConstantBindingBuilderImpl.class, AbstractBindingBuilder.class, BindingBuilder.class);
this.parent = null;
this.privateElements = null;
}
/**
* Creates a recording binder that's backed by {@code prototype}.
*/
private RecordingBinder(
RecordingBinder prototype, Object source, SourceProvider sourceProvider) {
checkArgument(source == null ^ sourceProvider == null);
this.stage = prototype.stage;
this.modules = prototype.modules;
this.elements = prototype.elements;
this.source = source;
this.sourceProvider = sourceProvider;
this.parent = prototype.parent;
this.privateElements = prototype.privateElements;
}
/**
* Creates a private recording binder.
*/
private RecordingBinder(RecordingBinder parent, PrivateElementsImpl privateElements) {
this.stage = parent.stage;
this.modules = Sets.newHashSet();
this.elements = privateElements.getElementsMutable();
this.source = parent.source;
this.sourceProvider = parent.sourceProvider;
this.parent = parent;
this.privateElements = privateElements;
}
public void bindScope(Class annotationType, Scope scope) {
elements.add(new ScopeBinding(getSource(), annotationType, scope));
}
@SuppressWarnings("unchecked") // it is safe to use the type literal for the raw type
public void requestInjection(Object instance) {
requestInjection((TypeLiteral) TypeLiteral.get(instance.getClass()), instance);
}
public void requestInjection(TypeLiteral type, T instance) {
elements.add(new InjectionRequest(getSource(), type, instance));
}
public MembersInjector getMembersInjector(final TypeLiteral typeLiteral) {
final MembersInjectorLookup element
= new MembersInjectorLookup(getSource(), typeLiteral);
elements.add(element);
return element.getMembersInjector();
}
public MembersInjector getMembersInjector(Class type) {
return getMembersInjector(TypeLiteral.get(type));
}
public void bindListener(Matcher> typeMatcher, TypeListener listener) {
elements.add(new TypeListenerBinding(getSource(), listener, typeMatcher));
}
public void requestStaticInjection(Class... types) {
for (Class type : types) {
elements.add(new StaticInjectionRequest(getSource(), type));
}
}
public void install(Module module) {
if (modules.add(module)) {
Binder binder = this;
if (module instanceof PrivateModule) {
binder = binder.newPrivateBinder();
}
try {
module.configure(binder);
} catch (RuntimeException e) {
Collection messages = Errors.getMessagesFromThrowable(e);
if (!messages.isEmpty()) {
elements.addAll(messages);
} else {
addError(e);
}
}
binder.install(ProviderMethodsModule.forModule(module));
}
}
public Stage currentStage() {
return stage;
}
public void addError(String message, Object... arguments) {
elements.add(new Message(getSource(), Errors.format(message, arguments)));
}
public void addError(Throwable t) {
String message = "An exception was caught and reported. Message: " + t.getMessage();
elements.add(new Message(ImmutableList.of(getSource()), message, t));
}
public void addError(Message message) {
elements.add(message);
}
public AnnotatedBindingBuilder bind(Key key) {
return new BindingBuilder(this, elements, getSource(), key);
}
public AnnotatedBindingBuilder bind(TypeLiteral typeLiteral) {
return bind(Key.get(typeLiteral));
}
public AnnotatedBindingBuilder bind(Class type) {
return bind(Key.get(type));
}
public AnnotatedConstantBindingBuilder bindConstant() {
return new ConstantBindingBuilderImpl(this, elements, getSource());
}
public Provider getProvider(final Key key) {
final ProviderLookup element = new ProviderLookup(getSource(), key);
elements.add(element);
return element.getProvider();
}
public Provider getProvider(Class type) {
return getProvider(Key.get(type));
}
public void convertToTypes(Matcher> typeMatcher,
TypeConverter converter) {
elements.add(new TypeConverterBinding(getSource(), typeMatcher, converter));
}
public RecordingBinder withSource(final Object source) {
return new RecordingBinder(this, source, null);
}
public RecordingBinder skipSources(Class... classesToSkip) {
// if a source is specified explicitly, we don't need to skip sources
if (source != null) {
return this;
}
SourceProvider newSourceProvider = sourceProvider.plusSkippedClasses(classesToSkip);
return new RecordingBinder(this, null, newSourceProvider);
}
public PrivateBinder newPrivateBinder() {
PrivateElementsImpl privateElements = new PrivateElementsImpl(getSource());
elements.add(privateElements);
return new RecordingBinder(this, privateElements);
}
public void expose(Key key) {
exposeInternal(key);
}
public AnnotatedElementBuilder expose(Class type) {
return exposeInternal(Key.get(type));
}
public AnnotatedElementBuilder expose(TypeLiteral type) {
return exposeInternal(Key.get(type));
}
private AnnotatedElementBuilder exposeInternal(Key key) {
if (privateElements == null) {
addError("Cannot expose %s on a standard binder. "
+ "Exposed bindings are only applicable to private binders.", key);
return new AnnotatedElementBuilder() {
public void annotatedWith(Class annotationType) {
}
public void annotatedWith(Annotation annotation) {
}
};
}
ExposureBuilder builder = new ExposureBuilder(this, getSource(), key);
privateElements.addExposureBuilder(builder);
return builder;
}
private static ESLogger logger = Loggers.getLogger(Bootstrap.class);
protected Object getSource() {
Object ret;
if (logger.isDebugEnabled()) {
ret = sourceProvider != null
? sourceProvider.get()
: source;
} else {
ret = source;
}
return ret == null ? "_unknown_" : ret;
}
@Override
public String toString() {
return "Binder";
}
}
}
