io.airlift.drift.client.address.SimpleAddressSelectorBinder.java Source code

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Here is the source code for io.airlift.drift.client.address.SimpleAddressSelectorBinder.java

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/*
 * Copyright (C) 2012 Facebook, 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 io.airlift.drift.client.address;

import com.google.common.collect.ImmutableList;
import com.google.common.net.HostAndPort;
import com.google.inject.Binder;
import com.google.inject.Injector;
import com.google.inject.Key;
import io.airlift.drift.client.guice.AbstractAnnotatedProvider;
import io.airlift.drift.client.guice.AddressSelectorBinder;

import java.lang.annotation.Annotation;
import java.util.List;
import java.util.Optional;

import static com.google.common.base.Preconditions.checkArgument;
import static io.airlift.configuration.ConfigBinder.configBinder;
import static java.util.Objects.requireNonNull;

public final class SimpleAddressSelectorBinder implements AddressSelectorBinder {
    public static AddressSelectorBinder simpleAddressSelector() {
        return new SimpleAddressSelectorBinder(Optional.empty());
    }

    public static AddressSelectorBinder simpleAddressSelector(HostAndPort defaultAddress) {
        requireNonNull(defaultAddress, "defaultAddress is null");
        return new SimpleAddressSelectorBinder(Optional.of(ImmutableList.of(defaultAddress)));
    }

    public static AddressSelectorBinder simpleAddressSelector(List<HostAndPort> defaultAddresses) {
        requireNonNull(defaultAddresses, "defaultAddresses is null");
        checkArgument(!defaultAddresses.isEmpty(), "defaultAddresses is empty");
        return new SimpleAddressSelectorBinder(Optional.of(ImmutableList.copyOf(defaultAddresses)));
    }

    private final Optional<List<HostAndPort>> defaultAddresses;

    private SimpleAddressSelectorBinder(Optional<List<HostAndPort>> defaultAddresses) {
        this.defaultAddresses = requireNonNull(defaultAddresses, "defaultAddresses is null");
    }

    @Override
    public void bind(Binder binder, Annotation annotation, String prefix) {
        configBinder(binder).bindConfig(SimpleAddressSelectorConfig.class, annotation, prefix);

        defaultAddresses
                .ifPresent(addresses -> configBinder(binder).bindConfigDefaults(SimpleAddressSelectorConfig.class,
                        annotation, config -> config.setAddressesList(addresses)));

        binder.bind(AddressSelector.class).annotatedWith(annotation)
                .toProvider(new SimpleAddressSelectorProvider(annotation));
    }

    private static class SimpleAddressSelectorProvider extends AbstractAnnotatedProvider<AddressSelector<?>> {
        public SimpleAddressSelectorProvider(Annotation annotation) {
            super(annotation);
        }

        @Override
        protected AddressSelector<?> get(Injector injector, Annotation annotation) {
            return new SimpleAddressSelector(
                    injector.getInstance(Key.get(SimpleAddressSelectorConfig.class, annotation)));
        }
    }
}