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Google Api eXtensions for Java
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/*
 * Copyright 2022 Google LLC
 *
 * 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.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * 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,
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package com.google.api.gax.httpjson;

import com.google.api.gax.rpc.ApiCallContext;
import com.google.api.gax.rpc.ResponseObserver;
import com.google.api.gax.rpc.ServerStreamingCallable;
import com.google.api.gax.rpc.StreamController;
import com.google.common.base.Preconditions;

/**
 * {@code HttpJsonDirectServerStreamingCallable} creates server-streaming REST calls.
 *
 * In a chain of {@link ServerStreamingCallable}s this is the innermost callable. It wraps a
 * {@link HttpJsonClientCall} in a {@link StreamController} and the downstream {@link
 * ResponseObserver} in a {@link HttpJsonClientCall.Listener}. This class is implemented to look and
 * behave as similarly as possible to gRPC variant of it.
 *
 * Package-private for internal use.
 */
class HttpJsonDirectServerStreamingCallable
    extends ServerStreamingCallable {

  private final ApiMethodDescriptor descriptor;

  HttpJsonDirectServerStreamingCallable(ApiMethodDescriptor descriptor) {
    this.descriptor = descriptor;
  }

  @Override
  public void call(
      RequestT request, ResponseObserver responseObserver, ApiCallContext context) {

    Preconditions.checkNotNull(request);
    Preconditions.checkNotNull(responseObserver);

    HttpJsonClientCall call = HttpJsonClientCalls.newCall(descriptor, context);
    HttpJsonDirectStreamController controller =
        new HttpJsonDirectStreamController<>(call, responseObserver);
    controller.start(request, context);
  }
}