org.javabits.yar.guice.DefaultRegistryAnnotatedBindingBuilderImpl Maven / Gradle / Ivy

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There is a newer version: 3.0.1.RELEASE
/*
 * Copyright (c) 4/30/15 8:53 PM Romain Gilles
 *
 * 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.javabits.yar.guice;

import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.util.Types;
import org.javabits.yar.BlockingSupplier;
import org.javabits.yar.Supplier;

import java.lang.reflect.ParameterizedType;
import java.util.concurrent.TimeUnit;

/**
 * This binding builder will handle the classic binding to and from the registry.
 * This binding builder will produce 3 types of binding when {@link #toRegistry()} is executed.
 * 
 * Let say we want to get an implementation of the {@code Hello} interface from the registry.
 * Therefore you will add the following binding to your module:
 * 
 *     bind(Hello.class).toRegistry();
 * 
 * This binding will automatically amply the following available injections:
 * 
 *     @Inject Hello hello;
 *     @Inject com.google.common.base.Supplier>Hello< hello;
 *     @Inject org.javabits.yar.Supplier>Hello< hello;
 *     @Inject org.javabits.yar.BlockingSupplier>Hello< hello;
 * 
 * 
 * @author Romain Gilles
 */
class DefaultRegistryAnnotatedBindingBuilderImpl extends RegistryAnnotatedBindingBuilderImpl {

    DefaultRegistryAnnotatedBindingBuilderImpl(Binder binder, Key key) {
        super(binder, key);
    }

    DefaultRegistryAnnotatedBindingBuilderImpl(Binder binder, TypeLiteral typeLiteral) {
        super(binder, typeLiteral);
    }

    DefaultRegistryAnnotatedBindingBuilderImpl(Binder binder, Class clazz) {
        super(binder, clazz);
    }

    @Override
    public void toRegistry(long timeout, TimeUnit unit) {
        linkedBindingBuilder().toProvider(newRegistryProvider(timeout, unit));
        bindSuppliers();
    }

    @Override
    Iterable> doToRegistry() {
        RegistryProvider registryProvider = newRegistryProvider();
        linkedBindingBuilder().toProvider(registryProvider);
        RegistryProvider> blockingSupplierRegistryProvider = bindSuppliers();
        return ImmutableList.of(registryProvider, blockingSupplierRegistryProvider);
    }

    private RegistryProvider> bindSuppliers() {
        Key> blockingSupplierKey = newBlockingSupplierKey();
        BlockingSupplierRegistryProvider blockingSupplierRegistryProvider = BlockingSupplierRegistryProvider.newProviderOf(key());
        binder().bind(blockingSupplierKey).toProvider(blockingSupplierRegistryProvider);
        Key> yarSupplierKey = newYarSupplierKey();
        binder().bind(yarSupplierKey).to(blockingSupplierKey);
        binder().bind(newGuavaSupplierKey()).to(yarSupplierKey);
        binder().bind(newJavaSupplierKey()).to(yarSupplierKey);
        return blockingSupplierRegistryProvider;
    }

    private Key> newGuavaSupplierKey() {
        ParameterizedType guavaSupplierType = Types.newParameterizedType(com.google.common.base.Supplier.class, key().getTypeLiteral().getType());
        return Keys.of(guavaSupplierType, key());
    }

    private Key> newJavaSupplierKey() {
        ParameterizedType guavaSupplierType = Types.newParameterizedType(java.util.function.Supplier.class, key().getTypeLiteral().getType());
        return Keys.of(guavaSupplierType, key());
    }

    private Key> newYarSupplierKey() {
        ParameterizedType yarSupplierType = Types.newParameterizedType(Supplier.class, key().getTypeLiteral().getType());
        return Keys.of(yarSupplierType, key());
    }

    private Key> newBlockingSupplierKey() {
        ParameterizedType blockingSupplierType = Types.newParameterizedType(BlockingSupplier.class, key().getTypeLiteral().getType());
        return Keys.of(blockingSupplierType, key());
    }

    private RegistryProvider newRegistryProvider(long timeout, TimeUnit unit) {
        return new RegistryProviderImpl<>(key(), timeout, unit);
    }

    private RegistryProvider newRegistryProvider() {
        return new RegistryProviderImpl<>(key());
    }
}