/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group 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.druid.guice.http;

import com.google.common.base.Supplier;
import com.google.inject.Binding;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import com.metamx.common.lifecycle.Lifecycle;

import javax.net.ssl.SSLContext;
import java.lang.annotation.Annotation;

/**
 */
public abstract class AbstractHttpClientProvider<HttpClientType> implements Provider<HttpClientType>
{
  private final Key<Supplier<DruidHttpClientConfig>> configKey;
  private final Key<SSLContext> sslContextKey;

  private Provider<Supplier<DruidHttpClientConfig>> configProvider;
  private Provider<Lifecycle> lifecycleProvider;
  private Binding<SSLContext> sslContextBinding;

  public AbstractHttpClientProvider()
  {
    configKey = Key.get(
        new TypeLiteral<Supplier<DruidHttpClientConfig>>()
        {
        }
    );
    sslContextKey = Key.get(SSLContext.class);
  }

  public AbstractHttpClientProvider(Annotation annotation)
  {
    configKey = Key.get(
        new TypeLiteral<Supplier<DruidHttpClientConfig>>()
        {
        }, annotation
    );
    sslContextKey = Key.get(SSLContext.class, annotation);
  }

  public AbstractHttpClientProvider(Class<? extends Annotation> annotation)
  {
    configKey = Key.get(
        new TypeLiteral<Supplier<DruidHttpClientConfig>>()
        {
        }, annotation
    );
    sslContextKey = Key.get(SSLContext.class, annotation);
  }

  @Inject
  public void configure(Injector injector)
  {
    configProvider = injector.getProvider(configKey);
    sslContextBinding = injector.getExistingBinding(sslContextKey);
    lifecycleProvider = injector.getProvider(Lifecycle.class);
  }

  public Key<Supplier<DruidHttpClientConfig>> getConfigKey()
  {
    return configKey;
  }

  public Key<SSLContext> getSslContextKey()
  {
    return sslContextKey;
  }

  public Provider<Supplier<DruidHttpClientConfig>> getConfigProvider()
  {
    return configProvider;
  }

  public Provider<Lifecycle> getLifecycleProvider()
  {
    return lifecycleProvider;
  }

  public Binding<SSLContext> getSslContextBinding()
  {
    return sslContextBinding;
  }
}

/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group 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.druid.guice.http;

import com.google.common.base.Supplier;
import com.google.inject.Binding;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import com.metamx.common.lifecycle.Lifecycle;

import javax.net.ssl.SSLContext;
import java.lang.annotation.Annotation;

/**
 */
public abstract class AbstractHttpClientProvider<HttpClientType> implements Provider<HttpClientType>
{
  private final Key<Supplier<DruidHttpClientConfig>> configKey;
  private final Key<SSLContext> sslContextKey;

  private Injector injector;

  public AbstractHttpClientProvider()
  {
    configKey = Key.get(
        new TypeLiteral<Supplier<DruidHttpClientConfig>>()
        {
        }
    );
    sslContextKey = Key.get(SSLContext.class);
  }

  public AbstractHttpClientProvider(Annotation annotation)
  {
    configKey = Key.get(
        new TypeLiteral<Supplier<DruidHttpClientConfig>>()
        {
        }, annotation
    );
    sslContextKey = Key.get(SSLContext.class, annotation);
  }

  public AbstractHttpClientProvider(Class<? extends Annotation> annotation)
  {
    configKey = Key.get(
        new TypeLiteral<Supplier<DruidHttpClientConfig>>()
        {
        }, annotation
    );
    sslContextKey = Key.get(SSLContext.class, annotation);
  }

  @Inject
  public void configure(Injector injector)
  {
    this.injector = injector;
  }

  public Key<Supplier<DruidHttpClientConfig>> getConfigKey()
  {
    return configKey;
  }

  public Key<SSLContext> getSslContextKey()
  {
    return sslContextKey;
  }

  public Provider<Supplier<DruidHttpClientConfig>> getConfigProvider()
  {
    return injector.getProvider(configKey);
  }

  public Provider<Lifecycle> getLifecycleProvider()
  {
    return injector.getProvider(Lifecycle.class);
  }

  public Binding<SSLContext> getSslContextBinding()
  {
    return injector.getExistingBinding(sslContextKey);
  }
}

Make AbstractHttpClientProvider contents lazily instantiated