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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.node;

import org.openqa.selenium.grid.data.Availability;
import org.openqa.selenium.internal.Require;

@FunctionalInterface
public interface HealthCheck {

  Result check();

  class Result {
    private final Availability availability;
    private final String message;

    public Result(Availability availability, String message) {
      this.availability = availability;
      this.message = Require.nonNull("Message", message);
    }

    public Availability getAvailability() {
      return availability;
    }

    public String getMessage() {
      return message;
    }
  }
}