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JDBC Driver for Google Cloud Spanner
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/*
 * Copyright 2016, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package nl.topicus.jdbc.shaded.io.grpc.internal;

import nl.topicus.jdbc.shaded.io.grpc.ServerMethodDefinition;
import nl.topicus.jdbc.shaded.io.grpc.ServerServiceDefinition;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import nl.topicus.jdbc.shaded.javax.annotation.Nullable;

final class InternalHandlerRegistry {

  private final List services;
  private final Map> methods;

  private InternalHandlerRegistry(
      List services, Map> methods) {
    this.services = services;
    this.methods = methods;
  }

  /**
   * Returns the service definitions in this registry.
   */
  public List getServices() {
    return services;
  }

  @Nullable
  ServerMethodDefinition lookupMethod(String methodName) {
    return methods.get(methodName);
  }

  static class Builder {

    // Store per-service first, to make sure services are added/replaced atomically.
    private final HashMap services =
        new LinkedHashMap();

    Builder addService(ServerServiceDefinition service) {
      services.put(service.getServiceDescriptor().getName(), service);
      return this;
    }

    InternalHandlerRegistry build() {
      Map> map =
          new HashMap>();
      for (ServerServiceDefinition service : services.values()) {
        for (ServerMethodDefinition method : service.getMethods()) {
          map.put(method.getMethodDescriptor().getFullMethodName(), method);
        }
      }
      return new InternalHandlerRegistry(
          Collections.unmodifiableList(new ArrayList(services.values())),
          Collections.unmodifiableMap(map));
    }
  }
}