com.google.cloud.bigtable.hbase1_x.BigtableAdmin Maven / Gradle / Ivy

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Bigtable connector compatible with HBase 1.x. It uses hbase-shaded-client and exposes unshaded bigtable-client-core. Its meant to be used in standalone applications and apache beam. Please use bigtable-hbase-1.x-hadoop for hadoop classpath compatible applications.

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/*
 * Copyright 2017 Google LLC
 *
 * 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.google.cloud.bigtable.hbase1_x;

import com.google.api.core.InternalApi;
import com.google.common.base.Throwables;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.Collections;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.implementation.InvocationHandlerAdapter;
import net.bytebuddy.matcher.ElementMatchers;
import org.apache.hadoop.hbase.ClusterStatus;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.AbstractBigtableAdmin;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.CommonConnection;

/**
 * This is an hbase 1.x implementation of {@link AbstractBigtableAdmin}. Most methods in this class
 * unsupported
 *
 * For internal use only - public for technical reasons.
 */
@InternalApi("For internal usage only")
@SuppressWarnings("deprecation")
public abstract class BigtableAdmin extends AbstractBigtableAdmin {

  public BigtableAdmin(CommonConnection connection) throws IOException {
    super(connection);
  }

  /** {@inheritDoc} */
  @Override
  public void disableTableAsync(TableName tableName) throws IOException {
    disableTable(tableName);
  }

  /** {@inheritDoc} */
  @Override
  public void enableTableAsync(TableName tableName) throws IOException {
    enableTable(tableName);
  }

  @Override
  public ClusterStatus getClusterStatus() throws IOException {
    return new ClusterStatus() {
      @Override
      public Collection getServers() {
        return Collections.emptyList();
      }
    };
  }

  private static Class adminClass = null;

  /**
   * This is a workaround for incompatible changes in hbase minor versions. Dynamically generates a
   * class that extends BigtableAdmin so incompatible methods won't be accessed unless the methods
   * are called. If a method is implemented by BigtableAdmin, the generated class will invoke the
   * implementation in BigtableAdmin. Otherwise it'll throw {@link UnsupportedOperationException}.
   */
  private static synchronized Class getSubclass() {
    if (adminClass == null) {
      adminClass =
          new ByteBuddy()
              .subclass(BigtableAdmin.class)
              .method(ElementMatchers.isAbstract())
              .intercept(
                  InvocationHandlerAdapter.of(
                      new AbstractBigtableAdmin.UnsupportedOperationsHandler()))
              .make()
              .load(BigtableAdmin.class.getClassLoader())
              .getLoaded();
    }
    return adminClass;
  }

  public static Admin createInstance(CommonConnection connection) throws IOException {
    try {
      return getSubclass().getDeclaredConstructor(CommonConnection.class).newInstance(connection);
    } catch (InvocationTargetException e) {
      // Unwrap and throw IOException or RuntimeException as is, and convert all other exceptions to
      // IOException because
      // org.apache.hadoop.hbase.client.Connection#getAdmin() only throws
      // IOException
      Throwables.throwIfInstanceOf(e.getTargetException(), IOException.class);
      Throwables.throwIfInstanceOf(e.getTargetException(), RuntimeException.class);
      throw new IOException(e);
    } catch (Exception e) {
      throw new IOException(e);
    }
  }
}