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Server functionality for HBase
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.hadoop.hbase.client;

import java.io.IOException;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import org.apache.hadoop.hbase.HRegionLocation;
import org.apache.hadoop.hbase.RegionLocations;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Connection registry implementation for region server.
 */
@InterfaceAudience.Private
public class RegionServerRegistry implements ConnectionRegistry {

  private final HRegionServer regionServer;

  public RegionServerRegistry(HRegionServer regionServer) {
    this.regionServer = regionServer;
  }

  @Override
  public CompletableFuture getMetaRegionLocations() {
    CompletableFuture future = new CompletableFuture<>();
    Optional> locs =
      regionServer.getMetaRegionLocationCache().getMetaRegionLocations();
    if (locs.isPresent()) {
      List list = locs.get();
      if (list.isEmpty()) {
        future.completeExceptionally(new IOException("no meta location available"));
      } else {
        future.complete(new RegionLocations(list));
      }
    } else {
      future.completeExceptionally(new IOException("no meta location available"));
    }
    return future;
  }

  @Override
  public CompletableFuture getClusterId() {
    return CompletableFuture.completedFuture(regionServer.getClusterId());
  }

  @Override
  public CompletableFuture getActiveMaster() {
    CompletableFuture future = new CompletableFuture<>();
    Optional activeMaster = regionServer.getActiveMaster();
    if (activeMaster.isPresent()) {
      future.complete(activeMaster.get());
    } else {
      future.completeExceptionally(new IOException("no active master available"));
    }
    return future;
  }

  @Override
  public String getConnectionString() {
    return "short-circuit";
  }

  @Override
  public void close() {
    // nothing
  }
}