core/src/main/java/io/grpc/ServerBuilder.java

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package io.grpc;

import java.io.File;
import java.util.concurrent.Executor;

import javax.annotation.Nullable;

/**
 * A builder for {@link Server} instances.
 *
 * @param <T> The concrete type of this builder.
 */
public abstract class ServerBuilder<T extends ServerBuilder<T>> {

  public static ServerBuilder<?> forPort(int port) {
    return ServerProvider.provider().builderForPort(port);
  }

  /**
   * Execute application code directly in the transport thread.
   *
   * <p>Depending on the underlying transport, using a direct executor may lead to substantial
   * performance improvements. However, it also requires the application to not block under
   * any circumstances.
   *
   * <p>Calling this method is semantically equivalent to calling {@link #executor(Executor)} and
   * passing in a direct executor. However, this is the preferred way as it may allow the transport
   * to perform special optimizations.
   */
  public abstract T directExecutor();

  /**
   * Provides a custom executor.
   *
   * <p>It's an optional parameter. If the user has not provided an executor when the server is
   * built, the builder will use a static cached thread pool.
   *
   * <p>The server won't take ownership of the given executor. It's caller's responsibility to
   * shut down the executor when it's desired.
   */
  public abstract T executor(@Nullable Executor executor);

  /**
   * Adds a service implementation to the handler registry.
   *
   * @param service ServerServiceDefinition object
   */
  public abstract T addService(ServerServiceDefinition service);

  /**
   * Adds a service implementation to the handler registry. If bindableService implements
   * {@link InternalNotifyOnServerBuild}, the service will receive a reference to the generated
   * server instance upon build().
   *
   * @param bindableService BindableService object
   */
  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/2222")
  public abstract T addService(BindableService bindableService);

  /**
   * Adds a {@link ServerTransportFilter}. The order of filters being added is the order they will
   * be executed.
   */
  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/2132")
  public T addTransportFilter(ServerTransportFilter filter) {
    throw new UnsupportedOperationException();
  }

  /**
   * Sets a fallback handler registry that will be looked up in if a method is not found in the
   * primary registry.
   */
  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/933")
  public abstract T fallbackHandlerRegistry(@Nullable HandlerRegistry fallbackRegistry);

  /**
   * Makes the server use TLS.
   *
   * @param certChain file containing the full certificate chain
   * @param privateKey file containing the private key
   */
  public abstract T useTransportSecurity(File certChain, File privateKey);

  /**
   * Set the decompression registry for use in the channel.  This is an advanced API call and
   * shouldn't be used unless you are using custom message encoding.   The default supported
   * decompressors are in {@code DecompressorRegistry.getDefaultInstance}.
   */
  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1704")
  public abstract T decompressorRegistry(@Nullable DecompressorRegistry registry);

  /**
   * Set the compression registry for use in the channel.  This is an advanced API call and
   * shouldn't be used unless you are using custom message encoding.   The default supported
   * compressors are in {@code CompressorRegistry.getDefaultInstance}.
   */
  @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1704")
  public abstract T compressorRegistry(@Nullable CompressorRegistry registry);

  /**
   * Builds a server using the given parameters.
   *
   * <p>The returned service will not been started or be bound a port. You will need to start it
   * with {@link Server#start()}.
   */
  public abstract Server build();
}