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Scio add-on for Google Cloud Bigtable

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/*
 * Copyright 2016 Spotify AB.
 *
 * 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.spotify.scio.bigtable;

import com.google.bigtable.repackaged.com.google.cloud.config.BigtableOptions;
import com.google.bigtable.repackaged.com.google.cloud.grpc.BigtableSession;
import com.google.bigtable.repackaged.com.google.cloud.grpc.io.ChannelPool;
import com.google.bigtable.repackaged.com.google.cloud.grpc.io.CredentialInterceptorCache;
import com.google.bigtable.repackaged.com.google.cloud.grpc.io.HeaderInterceptor;
import com.google.bigtable.repackaged.io.grpc.ManagedChannel;
import com.google.common.collect.ImmutableList;

import java.io.IOException;
import java.util.List;

public class ChannelPoolCreator {
  public static final BigtableOptions options = new BigtableOptions.Builder().build();
  public static List interceptors;

  static {
    try {
      interceptors = ImmutableList.of(CredentialInterceptorCache.getInstance()
              .getCredentialsInterceptor(options.getCredentialOptions(), options.getRetryOptions()));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static ChannelPool createPool(final String host) throws IOException {
    return new ChannelPool(interceptors, new ChannelPool.ChannelFactory() {
      @Override
      public ManagedChannel create() throws IOException {
        return BigtableSession.createNettyChannel(host, options);
      }
    });
  }
}