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Jaeger Java bindings for OpenTracing API

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/*
 * Copyright (c) 2016, Uber Technologies, Inc
 *
 * Licensed 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 com.uber.jaeger.samplers;

import static com.uber.jaeger.utils.Http.makeGetRequest;

import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import com.uber.jaeger.exceptions.SamplingStrategyErrorException;
import com.uber.jaeger.samplers.http.SamplingStrategyResponse;

import java.io.IOException;
import java.net.URLEncoder;

import lombok.ToString;


@ToString
public class HttpSamplingManager implements SamplingManager {
  public static final String DEFAULT_HOST_PORT = "localhost:5778";
  private final Gson gson = new Gson();
  private final String hostPort;

  /**
   * This constructor expects running sampling manager on {@link #DEFAULT_HOST_PORT}.
   */
  public HttpSamplingManager() {
    this(DEFAULT_HOST_PORT);
  }

  public HttpSamplingManager(String hostPort) {
    this.hostPort = hostPort != null ? hostPort : DEFAULT_HOST_PORT;
  }

  SamplingStrategyResponse parseJson(String json) {
    try {
      return gson.fromJson(json, SamplingStrategyResponse.class);
    } catch (JsonSyntaxException e) {
      throw new SamplingStrategyErrorException("Cannot deserialize json", e);
    }
  }

  @Override
  public SamplingStrategyResponse getSamplingStrategy(String serviceName)
      throws SamplingStrategyErrorException {
    String jsonString;
    try {
      jsonString =
          makeGetRequest(
              "http://" + hostPort + "/?service=" + URLEncoder.encode(serviceName, "UTF-8"));
    } catch (IOException e) {
      throw new SamplingStrategyErrorException(
          "http call to get sampling strategy from local agent failed.", e);
    }

    return parseJson(jsonString);
  }
}