slider-core/src/main/java/org/apache/slider/server/appmaster/web/rest/publisher/PublisherResource.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.slider.server.appmaster.web.rest.publisher;

import org.apache.hadoop.yarn.webapp.NotFoundException;
import org.apache.slider.core.registry.docstore.PublishedConfigSet;
import org.apache.slider.core.registry.docstore.PublishedConfiguration;
import org.apache.slider.server.appmaster.web.WebAppApi;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletResponse;
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.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.UriInfo;
import java.io.IOException;

/**
 * This publishes configuration sets
 */
public class PublisherResource {
  protected static final Logger log =
      LoggerFactory.getLogger(PublisherResource.class);
  private final WebAppApi slider;

  public PublisherResource(WebAppApi slider) {
    this.slider = slider;
  }

  private void init(HttpServletResponse res, UriInfo uriInfo) {
    res.setContentType(null);
    log.debug(uriInfo.getRequestUri().toString());
  }

  private PublishedConfigSet getContent() {
    return slider.getAppState().getPublishedConfigurations();
  }

  @GET
  @Path("/")
  @Produces({MediaType.APPLICATION_JSON})
  public PublishedConfigSet getPublishedConfiguration(
      @Context UriInfo uriInfo,
      @Context HttpServletResponse res) {
    init(res, uriInfo);

    PublishedConfigSet publishedConfigSet = getContent();
    log.debug("number of avaiable configurations: {}", publishedConfigSet.size());
    return publishedConfigSet;
  }

  private void logRequest(UriInfo uriInfo) {
    log.debug(uriInfo.getRequestUri().toString());
  }

  @GET
  @Path("/{config}")
  @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
  public PublishedConfiguration getConfigurationInstance(
      @PathParam("config") String config,
      @Context UriInfo uriInfo,
      @Context HttpServletResponse res) {
    init(res, uriInfo);

    PublishedConfiguration publishedConfig = getContent().get(config);
    if (publishedConfig == null) {
      log.info("Configuration {} not found", config);
      throw new NotFoundException("Not found: " + uriInfo.getAbsolutePath());
    }
    return publishedConfig;
  }
  
  
  @GET
  @Path("/{config}/json")
  @Produces({MediaType.APPLICATION_JSON})
  public String getConfigurationContentJson(
      @PathParam("config") String config,
      @Context UriInfo uriInfo,
      @Context HttpServletResponse res) throws IOException {
    
    // delegate (including init)
    PublishedConfiguration publishedConfig =
        getConfigurationInstance(config, uriInfo, res);
    return publishedConfig.asJson();
  }

  
  @GET
  @Path("/{config}/xml")
  @Produces({MediaType.APPLICATION_XML})
  public String getConfigurationContentXML(
      @PathParam("config") String config,
      @Context UriInfo uriInfo,
      @Context HttpServletResponse res) throws IOException {
    
    // delegate (including init)
    PublishedConfiguration publishedConfig =
        getConfigurationInstance(config, uriInfo, res);
    return publishedConfig.asConfigurationXML();
  }

  
  
}