nl.topicus.jdbc.shaded.io.grpc.inprocess.InProcessServer Maven / Gradle / Ivy

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JDBC Driver for Google Cloud Spanner
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/*
 * Copyright 2015, gRPC Authors All rights reserved.
 *
 * 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 nl.topicus.jdbc.shaded.io.grpc.inprocess;

import static nl.topicus.jdbc.shaded.com.google.common.base.Preconditions.checkNotNull;

import nl.topicus.jdbc.shaded.com.google.common.annotations.VisibleForTesting;
import nl.topicus.jdbc.shaded.io.grpc.ServerStreamTracer;
import nl.topicus.jdbc.shaded.io.grpc.internal.InternalServer;
import nl.topicus.jdbc.shaded.io.grpc.internal.ObjectPool;
import nl.topicus.jdbc.shaded.io.grpc.internal.ServerListener;
import nl.topicus.jdbc.shaded.io.grpc.internal.ServerTransportListener;
import nl.topicus.jdbc.shaded.io.grpc.internal.SharedResourceHolder.Resource;
import nl.topicus.jdbc.shaded.io.grpc.internal.SharedResourcePool;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ScheduledExecutorService;
import nl.topicus.jdbc.shaded.javax.annotation.concurrent.ThreadSafe;

@ThreadSafe
final class InProcessServer implements InternalServer {
  private static final ConcurrentMap registry
      = new ConcurrentHashMap();

  static InProcessServer findServer(String name) {
    return registry.get(name);
  }

  private final String name;
  private final List streamTracerFactories;
  private ServerListener listener;
  private boolean shutdown;
  /** Expected to be a SharedResourcePool except in testing. */
  private final ObjectPool schedulerPool;
  /**
   * Only used to make sure the scheduler has at least one reference. Since child transports can
   * outlive this server, they must get their own reference.
   */
  private ScheduledExecutorService scheduler;

  InProcessServer(
      String name, Resource schedulerResource,
      List streamTracerFactories) {
    this(name, SharedResourcePool.forResource(schedulerResource), streamTracerFactories);
  }

  @VisibleForTesting
  InProcessServer(
      String name, ObjectPool schedulerPool,
      List streamTracerFactories) {
    this.name = name;
    this.schedulerPool = schedulerPool;
    this.streamTracerFactories =
        Collections.unmodifiableList(checkNotNull(streamTracerFactories, "streamTracerFactories"));
  }

  @Override
  public void start(ServerListener serverListener) throws IOException {
    this.listener = serverListener;
    this.scheduler = schedulerPool.getObject();
    // Must be last, as channels can start connecting after this point.
    if (registry.putIfAbsent(name, this) != null) {
      throw new IOException("name already registered: " + name);
    }
  }

  @Override
  public int getPort() {
    return -1;
  }

  @Override
  public void shutdown() {
    if (!registry.remove(name, this)) {
      throw new AssertionError();
    }
    scheduler = schedulerPool.returnObject(scheduler);
    synchronized (this) {
      shutdown = true;
      listener.serverShutdown();
    }
  }

  synchronized ServerTransportListener register(InProcessTransport transport) {
    if (shutdown) {
      return null;
    }
    return listener.transportCreated(transport);
  }

  ObjectPool getScheduledExecutorServicePool() {
    return schedulerPool;
  }

  List getStreamTracerFactories() {
    return streamTracerFactories;
  }
}