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/*
 * Copyright (C) 2006 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 org.elasticsearch.common.Classes;
import org.elasticsearch.common.inject.internal.Annotations;
import org.elasticsearch.common.inject.internal.BindingImpl;
import org.elasticsearch.common.inject.internal.Errors;
import org.elasticsearch.common.inject.internal.ErrorsException;
import org.elasticsearch.common.inject.internal.InstanceBindingImpl;
import org.elasticsearch.common.inject.internal.InternalContext;
import org.elasticsearch.common.inject.internal.InternalFactory;
import org.elasticsearch.common.inject.internal.LinkedBindingImpl;
import org.elasticsearch.common.inject.internal.LinkedProviderBindingImpl;
import org.elasticsearch.common.inject.internal.MatcherAndConverter;
import org.elasticsearch.common.inject.internal.Scoping;
import org.elasticsearch.common.inject.internal.SourceProvider;
import org.elasticsearch.common.inject.internal.ToStringBuilder;
import org.elasticsearch.common.inject.spi.BindingTargetVisitor;
import org.elasticsearch.common.inject.spi.ConvertedConstantBinding;
import org.elasticsearch.common.inject.spi.Dependency;
import org.elasticsearch.common.inject.spi.ProviderBinding;
import org.elasticsearch.common.inject.spi.ProviderKeyBinding;
import org.elasticsearch.common.inject.util.Providers;

import java.lang.annotation.Annotation;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static java.util.Collections.emptySet;
import static java.util.Collections.singleton;
import static org.elasticsearch.common.inject.internal.Annotations.findScopeAnnotation;

/**
 * Default {@link Injector} implementation.
 *
 * @author [email protected] (Bob Lee)
 * @see InjectorBuilder
 */
class InjectorImpl implements Injector, Lookups {
    final State state;
    boolean readOnly;
    BindingsMultimap bindingsMultimap = new BindingsMultimap();
    final Initializer initializer;

    /**
     * Just-in-time binding cache. Guarded by state.lock()
     */
    Map, BindingImpl> jitBindings = new HashMap<>();

    Lookups lookups = new DeferredLookups(this);

    InjectorImpl(State state, Initializer initializer) {
        this.state = state;
        this.initializer = initializer;
        localContext = new ThreadLocal<>();
    }

    /**
     * Indexes bindings by type.
     */
    void index() {
        for (Binding binding : state.getExplicitBindingsThisLevel().values()) {
            index(binding);
        }
    }

     void index(Binding binding) {
        bindingsMultimap.put(binding.getKey().getTypeLiteral(), binding);
    }

    @Override
    public  List> findBindingsByType(TypeLiteral type) {
        return bindingsMultimap.getAll(type);
    }

    /**
     * Gets a binding implementation.  First, it check to see if the parent has a binding.  If the
     * parent has a binding and the binding is scoped, it will use that binding.  Otherwise, this
     * checks for an explicit binding. If no explicit binding is found, it looks for a just-in-time
     * binding.
     */
    public  BindingImpl getBindingOrThrow(Key key, Errors errors)
            throws ErrorsException {
        // Check explicit bindings, i.e. bindings created by modules.
        BindingImpl binding = state.getExplicitBinding(key);
        if (binding != null) {
            return binding;
        }

        // Look for an on-demand binding.
        return getJustInTimeBinding(key, errors);
    }

    /**
     * Returns a just-in-time binding for {@code key}, creating it if necessary.
     *
     * @throws ErrorsException if the binding could not be created.
     */
    private  BindingImpl getJustInTimeBinding(Key key, Errors errors)
            throws ErrorsException {
        synchronized (state.lock()) {
            // first try to find a JIT binding that we've already created
            @SuppressWarnings("unchecked") // we only store bindings that match their key
            BindingImpl binding = (BindingImpl) jitBindings.get(key);

            if (binding != null) {
                return binding;
            }

            return createJustInTimeBindingRecursive(key, errors);
        }
    }

    /**
     * Returns true if the key type is Provider (but not a subclass of Provider).
     */
    static boolean isProvider(Key key) {
        return key.getTypeLiteral().getRawType().equals(Provider.class);
    }

    /**
     * Returns true if the key type is MembersInjector (but not a subclass of MembersInjector).
     */
    static boolean isMembersInjector(Key key) {
        return key.getTypeLiteral().getRawType().equals(MembersInjector.class)
                && !key.hasAnnotationType();
    }

    private  BindingImpl> createMembersInjectorBinding(
            Key> key, Errors errors) throws ErrorsException {
        Type membersInjectorType = key.getTypeLiteral().getType();
        if (!(membersInjectorType instanceof ParameterizedType)) {
            throw errors.cannotInjectRawMembersInjector().toException();
        }

        @SuppressWarnings("unchecked") // safe because T came from Key>
                TypeLiteral instanceType = (TypeLiteral) TypeLiteral.get(
                ((ParameterizedType) membersInjectorType).getActualTypeArguments()[0]);
        MembersInjector membersInjector = membersInjectorStore.get(instanceType, errors);

        InternalFactory> factory = new ConstantFactory<>(
                Initializables.of(membersInjector));


        return new InstanceBindingImpl<>(this, key, SourceProvider.UNKNOWN_SOURCE,
                factory, emptySet(), membersInjector);
    }

    /**
     * Creates a synthetic binding to {@code Provider}, i.e. a binding to the provider from
     * {@code Binding}.
     */
    private  BindingImpl> createProviderBinding(Key> key, Errors errors)
            throws ErrorsException {
        Type providerType = key.getTypeLiteral().getType();

        // If the Provider has no type parameter (raw Provider)...
        if (!(providerType instanceof ParameterizedType)) {
            throw errors.cannotInjectRawProvider().toException();
        }

        Type entryType = ((ParameterizedType) providerType).getActualTypeArguments()[0];

        @SuppressWarnings("unchecked") // safe because T came from Key>
                Key providedKey = (Key) key.ofType(entryType);

        BindingImpl delegate = getBindingOrThrow(providedKey, errors);
        return new ProviderBindingImpl<>(this, key, delegate);
    }

    static class ProviderBindingImpl extends BindingImpl>
            implements ProviderBinding> {
        final BindingImpl providedBinding;

        ProviderBindingImpl(InjectorImpl injector, Key> key, Binding providedBinding) {
            super(injector, key, providedBinding.getSource(), createInternalFactory(providedBinding),
                    Scoping.UNSCOPED);
            this.providedBinding = (BindingImpl) providedBinding;
        }

        static  InternalFactory> createInternalFactory(Binding providedBinding) {
            final Provider provider = providedBinding.getProvider();
            return new InternalFactory>() {
                @Override
                public Provider get(Errors errors, InternalContext context, Dependency dependency) {
                    return provider;
                }
            };
        }

        @Override
        public Key getProvidedKey() {
            return providedBinding.getKey();
        }

        @Override
        public  V acceptTargetVisitor(BindingTargetVisitor, V> visitor) {
            return visitor.visit(this);
        }

        @Override
        public void applyTo(Binder binder) {
            throw new UnsupportedOperationException("This element represents a synthetic binding.");
        }

        @Override
        public String toString() {
            return new ToStringBuilder(ProviderKeyBinding.class)
                    .add("key", getKey())
                    .add("providedKey", getProvidedKey())
                    .toString();
        }
    }

    /**
     * Converts a constant string binding to the required type.
     *
     * @return the binding if it could be resolved, or null if the binding doesn't exist
     * @throws org.elasticsearch.common.inject.internal.ErrorsException
     *          if there was an error resolving the binding
     */
    private  BindingImpl convertConstantStringBinding(Key key, Errors errors)
            throws ErrorsException {
        // Find a constant string binding.
        Key stringKey = key.ofType(String.class);
        BindingImpl stringBinding = state.getExplicitBinding(stringKey);
        if (stringBinding == null || !stringBinding.isConstant()) {
            return null;
        }

        String stringValue = stringBinding.getProvider().get();
        Object source = stringBinding.getSource();

        // Find a matching type converter.
        TypeLiteral type = key.getTypeLiteral();
        MatcherAndConverter matchingConverter = state.getConverter(stringValue, type, errors, source);

        if (matchingConverter == null) {
            // No converter can handle the given type.
            return null;
        }

        // Try to convert the string. A failed conversion results in an error.
        try {
            @SuppressWarnings("unchecked") // This cast is safe because we double check below.
                    T converted = (T) matchingConverter.getTypeConverter().convert(stringValue, type);

            if (converted == null) {
                throw errors.converterReturnedNull(stringValue, source, type, matchingConverter)
                        .toException();
            }

            if (!type.getRawType().isInstance(converted)) {
                throw errors.conversionTypeError(stringValue, source, type, matchingConverter, converted)
                        .toException();
            }

            return new ConvertedConstantBindingImpl<>(this, key, converted, stringBinding);
        } catch (ErrorsException e) {
            throw e;
        } catch (RuntimeException e) {
            throw errors.conversionError(stringValue, source, type, matchingConverter, e)
                    .toException();
        }
    }

    private static class ConvertedConstantBindingImpl
            extends BindingImpl implements ConvertedConstantBinding {
        final T value;
        final Provider provider;
        final Binding originalBinding;

        ConvertedConstantBindingImpl(
                Injector injector, Key key, T value, Binding originalBinding) {
            super(injector, key, originalBinding.getSource(),
                    new ConstantFactory<>(Initializables.of(value)), Scoping.UNSCOPED);
            this.value = value;
            provider = Providers.of(value);
            this.originalBinding = originalBinding;
        }

        @Override
        public Provider getProvider() {
            return provider;
        }

        @Override
        public  V acceptTargetVisitor(BindingTargetVisitor visitor) {
            return visitor.visit(this);
        }

        @Override
        public T getValue() {
            return value;
        }

        @Override
        public Key getSourceKey() {
            return originalBinding.getKey();
        }

        @Override
        public Set> getDependencies() {
            return singleton(Dependency.get(getSourceKey()));
        }

        @Override
        public void applyTo(Binder binder) {
            throw new UnsupportedOperationException("This element represents a synthetic binding.");
        }

        @Override
        public String toString() {
            return new ToStringBuilder(ConvertedConstantBinding.class)
                    .add("key", getKey())
                    .add("sourceKey", getSourceKey())
                    .add("value", value)
                    .toString();
        }
    }

     void initializeBinding(BindingImpl binding, Errors errors) throws ErrorsException {
        // Put the partially constructed binding in the map a little early. This enables us to handle
        // circular dependencies. Example: FooImpl -> BarImpl -> FooImpl.
        // Note: We don't need to synchronize on state.lock() during injector creation.
        // TODO: for the above example, remove the binding for BarImpl if the binding for FooImpl fails
        if (binding instanceof ConstructorBindingImpl) {
            Key key = binding.getKey();
            jitBindings.put(key, binding);
            boolean successful = false;
            try {
                ((ConstructorBindingImpl) binding).initialize(this, errors);
                successful = true;
            } finally {
                if (!successful) {
                    jitBindings.remove(key);
                }
            }
        }
    }

    /**
     * Creates a binding for an injectable type with the given scope. Looks for a scope on the type if
     * none is specified.
     */
     BindingImpl createUnitializedBinding(Key key, Scoping scoping, Object source,
                                                Errors errors) throws ErrorsException {
        Class rawType = key.getTypeLiteral().getRawType();

        // Don't try to inject arrays, or enums.
        if (rawType.isArray() || rawType.isEnum()) {
            throw errors.missingImplementation(key).toException();
        }

        // Handle TypeLiteral by binding the inner type
        if (rawType == TypeLiteral.class) {
            @SuppressWarnings("unchecked") // we have to fudge the inner type as Object
                    BindingImpl binding = (BindingImpl) createTypeLiteralBinding(
                    (Key>) key, errors);
            return binding;
        }

        // Handle @ImplementedBy
        ImplementedBy implementedBy = rawType.getAnnotation(ImplementedBy.class);
        if (implementedBy != null) {
            Annotations.checkForMisplacedScopeAnnotations(rawType, source, errors);
            return createImplementedByBinding(key, scoping, implementedBy, errors);
        }

        // Handle @ProvidedBy.
        ProvidedBy providedBy = rawType.getAnnotation(ProvidedBy.class);
        if (providedBy != null) {
            Annotations.checkForMisplacedScopeAnnotations(rawType, source, errors);
            return createProvidedByBinding(key, scoping, providedBy, errors);
        }

        // We can't inject abstract classes.
        // TODO: Method interceptors could actually enable us to implement
        // abstract types. Should we remove this restriction?
        if (Modifier.isAbstract(rawType.getModifiers())) {
            throw errors.missingImplementation(key).toException();
        }

        // Error: Inner class.
        if (Classes.isInnerClass(rawType)) {
            throw errors.cannotInjectInnerClass(rawType).toException();
        }

        if (!scoping.isExplicitlyScoped()) {
            Class scopeAnnotation = findScopeAnnotation(errors, rawType);
            if (scopeAnnotation != null) {
                scoping = Scopes.makeInjectable(Scoping.forAnnotation(scopeAnnotation),
                        this, errors.withSource(rawType));
            }
        }

        return ConstructorBindingImpl.create(this, key, source, scoping);
    }

    /**
     * Converts a binding for a {@code Key>} to the value {@code TypeLiteral}. It's
     * a bit awkward because we have to pull out the inner type in the type literal.
     */
    private  BindingImpl> createTypeLiteralBinding(
            Key> key, Errors errors) throws ErrorsException {
        Type typeLiteralType = key.getTypeLiteral().getType();
        if (!(typeLiteralType instanceof ParameterizedType)) {
            throw errors.cannotInjectRawTypeLiteral().toException();
        }

        ParameterizedType parameterizedType = (ParameterizedType) typeLiteralType;
        Type innerType = parameterizedType.getActualTypeArguments()[0];

        // this is unfortunate. We don't support building TypeLiterals for type variable like 'T'. If
        // this proves problematic, we can probably fix TypeLiteral to support type variables
        if (!(innerType instanceof Class)
                && !(innerType instanceof GenericArrayType)
                && !(innerType instanceof ParameterizedType)) {
            throw errors.cannotInjectTypeLiteralOf(innerType).toException();
        }

        @SuppressWarnings("unchecked") // by definition, innerType == T, so this is safe
                TypeLiteral value = (TypeLiteral) TypeLiteral.get(innerType);
        InternalFactory> factory = new ConstantFactory<>(
                Initializables.of(value));
        return new InstanceBindingImpl<>(this, key, SourceProvider.UNKNOWN_SOURCE,
                factory, emptySet(), value);
    }

    /**
     * Creates a binding for a type annotated with @ProvidedBy.
     */
     BindingImpl createProvidedByBinding(Key key, Scoping scoping,
                                               ProvidedBy providedBy, Errors errors) throws ErrorsException {
        final Class rawType = key.getTypeLiteral().getRawType();
        final Class> providerType = providedBy.value();

        // Make sure it's not the same type. TODO: Can we check for deeper loops?
        if (providerType == rawType) {
            throw errors.recursiveProviderType().toException();
        }

        // Assume the provider provides an appropriate type. We double check at runtime.
        @SuppressWarnings("unchecked")
        final Key> providerKey
                = (Key>) Key.get(providerType);
        final BindingImpl> providerBinding
                = getBindingOrThrow(providerKey, errors);

        InternalFactory internalFactory = new InternalFactory() {
            @Override
            public T get(Errors errors, InternalContext context, Dependency dependency)
                    throws ErrorsException {
                errors = errors.withSource(providerKey);
                Provider provider = providerBinding.getInternalFactory().get(
                        errors, context, dependency);
                try {
                    Object o = provider.get();
                    if (o != null && !rawType.isInstance(o)) {
                        throw errors.subtypeNotProvided(providerType, rawType).toException();
                    }
                    @SuppressWarnings("unchecked") // protected by isInstance() check above
                            T t = (T) o;
                    return t;
                } catch (RuntimeException e) {
                    throw errors.errorInProvider(e).toException();
                }
            }
        };

        return new LinkedProviderBindingImpl<>(
                this,
                key,
                rawType /* source */,
                Scopes.scope(key, this, internalFactory, scoping),
                scoping,
                providerKey);
    }

    /**
     * Creates a binding for a type annotated with @ImplementedBy.
     */
     BindingImpl createImplementedByBinding(Key key, Scoping scoping,
                                                  ImplementedBy implementedBy, Errors errors)
            throws ErrorsException {
        Class rawType = key.getTypeLiteral().getRawType();
        Class implementationType = implementedBy.value();

        // Make sure it's not the same type. TODO: Can we check for deeper cycles?
        if (implementationType == rawType) {
            throw errors.recursiveImplementationType().toException();
        }

        // Make sure implementationType extends type.
        if (!rawType.isAssignableFrom(implementationType)) {
            throw errors.notASubtype(implementationType, rawType).toException();
        }

        @SuppressWarnings("unchecked") // After the preceding check, this cast is safe.
                Class subclass = (Class) implementationType;

        // Look up the target binding.
        final Key targetKey = Key.get(subclass);
        final BindingImpl targetBinding = getBindingOrThrow(targetKey, errors);

        InternalFactory internalFactory = new InternalFactory() {
            @Override
            public T get(Errors errors, InternalContext context, Dependency dependency)
                    throws ErrorsException {
                return targetBinding.getInternalFactory().get(
                        errors.withSource(targetKey), context, dependency);
            }
        };

        return new LinkedBindingImpl<>(
                this,
                key,
                rawType /* source */,
                Scopes.scope(key, this, internalFactory, scoping),
                scoping,
                targetKey);
    }

    /**
     * Attempts to create a just-in-time binding for {@code key} in the root injector, falling back to
     * other ancestor injectors until this injector is tried.
     */
    private  BindingImpl createJustInTimeBindingRecursive(Key key, Errors errors)
            throws ErrorsException {
        if (state.isBlacklisted(key)) {
            throw errors.childBindingAlreadySet(key).toException();
        }

        BindingImpl binding = createJustInTimeBinding(key, errors);
        state.parent().blacklist(key);
        jitBindings.put(key, binding);
        return binding;
    }

    /**
     * Returns a new just-in-time binding created by resolving {@code key}. The strategies used to
     * create just-in-time bindings are:
     * 
    *
  1. Internalizing Providers. If the requested binding is for {@code Provider}, we delegate * to the binding for {@code T}. *
  2. Converting constants. *
  3. ImplementedBy and ProvidedBy annotations. Only for unannotated keys. *
  4. The constructor of the raw type. Only for unannotated keys. *
* * @throws org.elasticsearch.common.inject.internal.ErrorsException * if the binding cannot be created. */ BindingImpl createJustInTimeBinding(Key key, Errors errors) throws ErrorsException { if (state.isBlacklisted(key)) { throw errors.childBindingAlreadySet(key).toException(); } // Handle cases where T is a Provider. if (isProvider(key)) { // These casts are safe. We know T extends Provider and that given Key>, // createProviderBinding() will return BindingImpl>. @SuppressWarnings("unchecked") BindingImpl binding = createProviderBinding((Key) key, errors); return binding; } // Handle cases where T is a MembersInjector if (isMembersInjector(key)) { // These casts are safe. T extends MembersInjector and that given Key>, // createMembersInjectorBinding() will return BindingImpl>. @SuppressWarnings("unchecked") BindingImpl binding = createMembersInjectorBinding((Key) key, errors); return binding; } // Try to convert a constant string binding to the requested type. BindingImpl convertedBinding = convertConstantStringBinding(key, errors); if (convertedBinding != null) { return convertedBinding; } // If the key has an annotation... if (key.hasAnnotationType()) { // Look for a binding without annotation attributes or return null. if (key.hasAttributes()) { try { Errors ignored = new Errors(); return getBindingOrThrow(key.withoutAttributes(), ignored); } catch (ErrorsException ignored) { // throw with a more appropriate message below } } throw errors.missingImplementation(key).toException(); } Object source = key.getTypeLiteral().getRawType(); BindingImpl binding = createUnitializedBinding(key, Scoping.UNSCOPED, source, errors); initializeBinding(binding, errors); return binding; } InternalFactory getInternalFactory(Key key, Errors errors) throws ErrorsException { return getBindingOrThrow(key, errors).getInternalFactory(); } private static class BindingsMultimap { final Map, List>> multimap = new HashMap<>(); void put(TypeLiteral type, Binding binding) { List> bindingsForType = multimap.get(type); if (bindingsForType == null) { bindingsForType = new ArrayList<>(); multimap.put(type, bindingsForType); } bindingsForType.add(binding); } @SuppressWarnings("unchecked") // safe because we only put matching entries into the map List> getAll(TypeLiteral type) { List> bindings = multimap.get(type); return bindings != null ? Collections.>unmodifiableList((List) multimap.get(type)) : Collections.>emptyList(); } } /** * Returns parameter injectors, or {@code null} if there are no parameters. */ SingleParameterInjector[] getParametersInjectors( List> parameters, Errors errors) throws ErrorsException { if (parameters.isEmpty()) { return null; } int numErrorsBefore = errors.size(); SingleParameterInjector[] result = new SingleParameterInjector[parameters.size()]; int i = 0; for (Dependency parameter : parameters) { try { result[i++] = createParameterInjector(parameter, errors.withSource(parameter)); } catch (ErrorsException rethrownBelow) { // rethrown below } } errors.throwIfNewErrors(numErrorsBefore); return result; } SingleParameterInjector createParameterInjector(final Dependency dependency, final Errors errors) throws ErrorsException { InternalFactory factory = getInternalFactory(dependency.getKey(), errors); return new SingleParameterInjector<>(dependency, factory); } /** * Invokes a method. */ interface MethodInvoker { Object invoke(Object target, Object... parameters) throws IllegalAccessException, InvocationTargetException; } /** * Cached constructor injectors for each type */ ConstructorInjectorStore constructors = new ConstructorInjectorStore(this); /** * Cached field and method injectors for each type. */ MembersInjectorStore membersInjectorStore; @Override @SuppressWarnings("unchecked") // the members injector type is consistent with instance's type public void injectMembers(Object instance) { MembersInjector membersInjector = getMembersInjector(instance.getClass()); membersInjector.injectMembers(instance); } @Override public MembersInjector getMembersInjector(TypeLiteral typeLiteral) { Errors errors = new Errors(typeLiteral); try { return membersInjectorStore.get(typeLiteral, errors); } catch (ErrorsException e) { throw new ConfigurationException(errors.merge(e.getErrors()).getMessages()); } } @Override public MembersInjector getMembersInjector(Class type) { return getMembersInjector(TypeLiteral.get(type)); } @Override public Provider getProvider(Class type) { return getProvider(Key.get(type)); } Provider getProviderOrThrow(final Key key, Errors errors) throws ErrorsException { final InternalFactory factory = getInternalFactory(key, errors); // ES: optimize for a common case of read only instance getting from the parent... if (factory instanceof InternalFactory.Instance) { return new Provider() { @Override public T get() { try { return (T) ((InternalFactory.Instance) factory).get(null, null, null); } catch (ErrorsException e) { // ignore } // should never happen... assert false; return null; } }; } final Dependency dependency = Dependency.get(key); return new Provider() { @Override public T get() { final Errors errors = new Errors(dependency); try { T t = callInContext(new ContextualCallable() { @Override public T call(InternalContext context) throws ErrorsException { context.setDependency(dependency); try { return factory.get(errors, context, dependency); } finally { context.setDependency(null); } } }); errors.throwIfNewErrors(0); return t; } catch (ErrorsException e) { throw new ProvisionException(errors.merge(e.getErrors()).getMessages()); } } @Override public String toString() { return factory.toString(); } }; } @Override public Provider getProvider(final Key key) { Errors errors = new Errors(key); try { Provider result = getProviderOrThrow(key, errors); errors.throwIfNewErrors(0); return result; } catch (ErrorsException e) { throw new ConfigurationException(errors.merge(e.getErrors()).getMessages()); } } @Override public T getInstance(Key key) { return getProvider(key).get(); } @Override public T getInstance(Class type) { return getProvider(type).get(); } private final ThreadLocal localContext; /** * Looks up thread local context. Creates (and removes) a new context if necessary. */ T callInContext(ContextualCallable callable) throws ErrorsException { Object[] reference = localContext.get(); if (reference == null) { reference = new Object[1]; localContext.set(reference); } if (reference[0] == null) { reference[0] = new InternalContext(); try { return callable.call((InternalContext) reference[0]); } finally { // Only clear the context if this call created it. reference[0] = null; } } else { // Someone else will clean up this context. return callable.call((InternalContext) reference[0]); } } @Override public String toString() { return new ToStringBuilder(Injector.class) .add("bindings", state.getExplicitBindingsThisLevel().values()) .toString(); } // ES_GUICE: clear caches public void clearCache() { state.clearBlacklisted(); constructors = new ConstructorInjectorStore(this); membersInjectorStore = new MembersInjectorStore(this, state.getTypeListenerBindings()); jitBindings = new HashMap<>(); } // ES_GUICE: make all registered bindings act as eager singletons public void readOnlyAllSingletons() { readOnly = true; state.makeAllBindingsToEagerSingletons(this); bindingsMultimap = new BindingsMultimap(); // reindex the bindings index(); } }




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