com.cloudera.oryx.example.serving.Distinct Maven / Gradle / Ivy

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/*
 * Copyright (c) 2015, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. 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
 *
 * This software 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.cloudera.oryx.example.serving;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.Map;

import com.cloudera.oryx.api.serving.OryxResource;
import com.cloudera.oryx.api.serving.OryxServingException;

/**
 * Responds to a GET request to {@code /distinct}. Returns all distinct words and their count.
 * Responds to a GET request to {@code /distinct/[word]} as well to get the count for one word. If the
 * word's count is unknown, returns an HTTP {@link Response.Status#BAD_REQUEST} error response.
 */
@Path("/distinct")
public final class Distinct extends OryxResource {

  @GET
  @Produces({MediaType.TEXT_PLAIN, MediaType.APPLICATION_JSON})
  public Map get() {
    return getModel().getWords();
  }

  @GET
  @Produces({MediaType.TEXT_PLAIN, MediaType.APPLICATION_JSON})
  @Path("{word}")
  public int get(@PathParam("word") String word) throws OryxServingException {
    Map map = getModel().getWords();
    Integer count;
    synchronized (map) {
      count = map.get(word);
    }
    if (count == null) {
      throw new OryxServingException(Response.Status.BAD_REQUEST, "No such word");
    }
    return count;
  }

  private ExampleServingModel getModel() {
    @SuppressWarnings("unchecked")
    ExampleServingModel model = (ExampleServingModel) getServingModelManager().getModel();
    return model;
  }

}