com.google.inject.internal.InjectorShell 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 com.google.inject.internal;
import static com.google.common.base.Preconditions.checkState;
import static com.google.inject.Scopes.SINGLETON;
import static com.google.inject.internal.GuiceInternal.GUICE_INTERNAL;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.inject.Binder;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.Stage;
import com.google.inject.internal.InjectorImpl.InjectorOptions;
import com.google.inject.internal.util.ContinuousStopwatch;
import com.google.inject.internal.util.SourceProvider;
import com.google.inject.spi.BindingSourceRestriction;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.Element;
import com.google.inject.spi.Elements;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.ModuleAnnotatedMethodScannerBinding;
import com.google.inject.spi.PrivateElements;
import com.google.inject.spi.ProvisionListenerBinding;
import com.google.inject.spi.TypeListenerBinding;
import java.util.List;
import java.util.Optional;
import java.util.logging.Logger;
/**
* InjectorShell is used by {@link InternalInjectorCreator} to recursively create a tree of
* uninitialized {@link Injector}s. Each InjectorShell corresponds to either the top-level root
* injector, or a private child injector.
*
* The root InjectorShell extracts elements from its list of modules and processes these elements
* to aggregate data that is used to populate its injector's fields. Child injectors are constructed
* similarly, but using {@link PrivateElements} instead of modules.
*
*
It is necessary to create the root and child injectors in a single batch because there can be
* bidirectional parent <-> child injector dependencies that require the entire tree of injectors to
* be initialized together in the {@link InternalInjectorCreator}.
*
* @author [email protected] (Jesse Wilson)
*/
final class InjectorShell {
private final List elements;
private final InjectorImpl injector;
private InjectorShell(List elements, InjectorImpl injector) {
this.elements = elements;
this.injector = injector;
}
InjectorImpl getInjector() {
return injector;
}
List getElements() {
return elements;
}
static class Builder {
private final List elements = Lists.newArrayList();
private final List modules = Lists.newArrayList();
// lazily constructed fields
private InjectorBindingData bindingData;
private InjectorJitBindingData jitBindingData;
private InjectorImpl parent;
private InjectorOptions options;
private Stage stage;
/** null unless this exists in a {@link Binder#newPrivateBinder private environment} */
private PrivateElementsImpl privateElements;
Builder stage(Stage stage) {
this.stage = stage;
return this;
}
Builder parent(InjectorImpl parent) {
this.parent = parent;
this.jitBindingData = new InjectorJitBindingData(Optional.of(parent.getJitBindingData()));
this.bindingData = new InjectorBindingData(Optional.of(parent.getBindingData()));
this.options = parent.options;
this.stage = options.stage;
return this;
}
Builder privateElements(PrivateElements privateElements) {
this.privateElements = (PrivateElementsImpl) privateElements;
this.elements.addAll(privateElements.getElements());
return this;
}
void addModules(Iterable modules) {
for (Module module : modules) {
this.modules.add(module);
}
}
Stage getStage() {
return options.stage;
}
/** Synchronize on this before calling {@link #build}. */
Object lock() {
// Lazily initializes bindingData and jitBindingData, if they were not already
// initialized with a parent injector by {@link #parent(InjectorImpl)}.
if (bindingData == null) {
jitBindingData = new InjectorJitBindingData(Optional.empty());
bindingData = new InjectorBindingData(Optional.empty());
}
return jitBindingData.lock();
}
/**
* Creates and returns the injector shells for the current modules. Multiple shells will be
* returned if any modules contain {@link Binder#newPrivateBinder private environments}. The
* primary injector will be first in the returned list.
*/
List build(
Initializer initializer,
ProcessedBindingData processedBindingData,
ContinuousStopwatch stopwatch,
Errors errors) {
checkState(stage != null, "Stage not initialized");
checkState(privateElements == null || parent != null, "PrivateElements with no parent");
checkState(bindingData != null, "no binding data. Did you remember to lock() ?");
checkState(
(privateElements == null && elements.isEmpty()) || modules.isEmpty(),
"The shell is either built from modules (root) or from PrivateElements (children).");
// bind Singleton if this is a top-level injector
if (parent == null) {
modules.add(0, new RootModule());
} else {
modules.add(0, new InheritedScannersModule(parent.getBindingData()));
}
elements.addAll(Elements.getElements(stage, modules));
// Check binding source restrictions only for the root shell (note that the root shell
// can have a parent Injector, when Injector.createChildInjector is called). It isn't
// necessary to call this check on child PrivateElements shells because it walks the entire
// tree of elements, recurring on PrivateElements.
if (privateElements == null) {
elements.addAll(BindingSourceRestriction.check(GUICE_INTERNAL, elements));
}
// Look for injector-changing options
InjectorOptionsProcessor optionsProcessor = new InjectorOptionsProcessor(errors);
optionsProcessor.process(null, elements);
options = optionsProcessor.getOptions(stage, options);
InjectorImpl injector = new InjectorImpl(parent, bindingData, jitBindingData, options);
if (privateElements != null) {
privateElements.initInjector(injector);
}
// add default type converters if this is a top-level injector
if (parent == null) {
TypeConverterBindingProcessor.prepareBuiltInConverters(injector);
}
stopwatch.resetAndLog("Module execution");
new MessageProcessor(errors).process(injector, elements);
new InterceptorBindingProcessor(errors).process(injector, elements);
stopwatch.resetAndLog("Interceptors creation");
new ListenerBindingProcessor(errors).process(injector, elements);
List typeListenerBindings =
injector.getBindingData().getTypeListenerBindings();
injector.membersInjectorStore = new MembersInjectorStore(injector, typeListenerBindings);
List provisionListenerBindings =
injector.getBindingData().getProvisionListenerBindings();
injector.provisionListenerStore =
new ProvisionListenerCallbackStore(provisionListenerBindings);
stopwatch.resetAndLog("TypeListeners & ProvisionListener creation");
new ScopeBindingProcessor(errors).process(injector, elements);
stopwatch.resetAndLog("Scopes creation");
new TypeConverterBindingProcessor(errors).process(injector, elements);
stopwatch.resetAndLog("Converters creation");
bindStage(injector, stage);
bindInjector(injector);
bindLogger(injector);
// Process all normal bindings, then UntargettedBindings.
// This is necessary because UntargettedBindings can create JIT bindings
// and need all their other dependencies set up ahead of time.
new BindingProcessor(errors, initializer, processedBindingData).process(injector, elements);
new UntargettedBindingProcessor(errors, processedBindingData).process(injector, elements);
stopwatch.resetAndLog("Binding creation");
new ModuleAnnotatedMethodScannerProcessor(errors).process(injector, elements);
stopwatch.resetAndLog("Module annotated method scanners creation");
List injectorShells = Lists.newArrayList();
injectorShells.add(new InjectorShell(elements, injector));
// recursively build child shells
PrivateElementProcessor processor = new PrivateElementProcessor(errors);
processor.process(injector, elements);
for (Builder builder : processor.getInjectorShellBuilders()) {
injectorShells.addAll(builder.build(initializer, processedBindingData, stopwatch, errors));
}
stopwatch.resetAndLog("Private environment creation");
return injectorShells;
}
}
/**
* The Injector is a special case because we allow both parent and child injectors to both have a
* binding for that key.
*/
private static void bindInjector(InjectorImpl injector) {
Key key = Key.get(Injector.class);
InjectorFactory injectorFactory = new InjectorFactory(injector);
injector
.getBindingData()
.putBinding(
key,
new ProviderInstanceBindingImpl(
injector,
key,
SourceProvider.UNKNOWN_SOURCE,
injectorFactory,
Scoping.UNSCOPED,
injectorFactory,
ImmutableSet.of()));
}
private static class InjectorFactory implements InternalFactory, Provider {
private final Injector injector;
private InjectorFactory(Injector injector) {
this.injector = injector;
}
@Override
public Injector get(InternalContext context, Dependency dependency, boolean linked) {
return injector;
}
@Override
public Injector get() {
return injector;
}
@Override
public String toString() {
return "Provider";
}
}
/**
* The Logger is a special case because it knows the injection point of the injected member. It's
* the only binding that does this.
*/
private static void bindLogger(InjectorImpl injector) {
Key key = Key.get(Logger.class);
LoggerFactory loggerFactory = new LoggerFactory();
injector
.getBindingData()
.putBinding(
key,
new ProviderInstanceBindingImpl(
injector,
key,
SourceProvider.UNKNOWN_SOURCE,
loggerFactory,
Scoping.UNSCOPED,
loggerFactory,
ImmutableSet.of()));
}
private static class LoggerFactory implements InternalFactory, Provider {
@Override
public Logger get(InternalContext context, Dependency dependency, boolean linked) {
InjectionPoint injectionPoint = dependency.getInjectionPoint();
return injectionPoint == null
? Logger.getAnonymousLogger()
: Logger.getLogger(injectionPoint.getMember().getDeclaringClass().getName());
}
@Override
public Logger get() {
return Logger.getAnonymousLogger();
}
@Override
public String toString() {
return "Provider";
}
}
private static void bindStage(InjectorImpl injector, Stage stage) {
Key key = Key.get(Stage.class);
InstanceBindingImpl stageBinding =
new InstanceBindingImpl(
injector,
key,
SourceProvider.UNKNOWN_SOURCE,
new ConstantFactory(Initializables.of(stage)),
ImmutableSet.of(),
stage);
injector.getBindingData().putBinding(key, stageBinding);
}
private static class RootModule implements Module {
@Override
public void configure(Binder binder) {
binder = binder.withSource(SourceProvider.UNKNOWN_SOURCE);
binder.bindScope(Singleton.class, SINGLETON);
binder.bindScope(javax.inject.Singleton.class, SINGLETON);
}
}
private static class InheritedScannersModule implements Module {
private final InjectorBindingData bindingData;
InheritedScannersModule(InjectorBindingData bindingData) {
this.bindingData = bindingData;
}
@Override
public void configure(Binder binder) {
for (ModuleAnnotatedMethodScannerBinding binding : bindingData.getScannerBindings()) {
binding.applyTo(binder);
}
}
}
}