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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.openqa.selenium.grid.sessionqueue;

import static org.openqa.selenium.remote.http.Contents.asJson;
import static org.openqa.selenium.remote.tracing.HttpTracing.newSpanAsChildOf;
import static org.openqa.selenium.remote.tracing.Tags.HTTP_REQUEST;
import static org.openqa.selenium.remote.tracing.Tags.HTTP_RESPONSE;

import java.util.Collections;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.remote.http.HttpHandler;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;
import org.openqa.selenium.remote.tracing.Span;
import org.openqa.selenium.remote.tracing.Tracer;

class GetSessionQueue implements HttpHandler {

  private final Tracer tracer;
  private final NewSessionQueue newSessionQueue;

  GetSessionQueue(Tracer tracer, NewSessionQueue newSessionQueue) {
    this.tracer = Require.nonNull("Tracer", tracer);
    this.newSessionQueue = Require.nonNull("New Session Queue", newSessionQueue);
  }

  @Override
  public HttpResponse execute(HttpRequest req) {
    try (Span span = newSpanAsChildOf(tracer, req, "sessionqueue.contents")) {
      HTTP_REQUEST.accept(span, req);

      HttpResponse response =
          new HttpResponse()
              .setContent(
                  asJson(Collections.singletonMap("value", newSessionQueue.getQueueContents())));

      HTTP_RESPONSE.accept(span, response);

      return response;
    }
  }
}