| /* |
| * 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.twill.yarn; |
| |
| import org.apache.twill.api.ResourceReport; |
| import org.apache.twill.internal.json.ResourceReportAdapter; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| import java.net.HttpURLConnection; |
| import java.net.URL; |
| import java.nio.charset.StandardCharsets; |
| import java.util.List; |
| import java.util.zip.DeflaterInputStream; |
| import java.util.zip.GZIPInputStream; |
| |
| /** |
| * Package private class to get {@link ResourceReport} from the application master. |
| */ |
| final class ResourceReportClient { |
| private static final Logger LOG = LoggerFactory.getLogger(ResourceReportClient.class); |
| |
| private final ResourceReportAdapter reportAdapter; |
| private final List<URL> resourceUrls; |
| |
| ResourceReportClient(List<URL> resourceUrls) { |
| this.resourceUrls = resourceUrls; |
| this.reportAdapter = ResourceReportAdapter.create(); |
| } |
| |
| /** |
| * Returns the resource usage of the application fetched from the resource endpoint URL. |
| * @return A {@link ResourceReport} or {@code null} if failed to fetch the report. |
| */ |
| public ResourceReport get() { |
| for (URL url : resourceUrls) { |
| try { |
| HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); |
| urlConn.setRequestProperty("Accept-Encoding", "gzip, deflate"); |
| |
| if (urlConn.getResponseCode() != 200) { |
| continue; |
| } |
| |
| try (Reader reader = new InputStreamReader(getInputStream(urlConn), StandardCharsets.UTF_8)) { |
| LOG.trace("Report returned by {}", url); |
| return reportAdapter.fromJson(reader); |
| } |
| } catch (IOException e) { |
| // Just log a trace as it's ok to not able to fetch resource report |
| LOG.trace("Exception raised when getting resource report from {}.", url, e); |
| } |
| } |
| return null; |
| } |
| |
| private InputStream getInputStream(HttpURLConnection urlConn) throws IOException { |
| InputStream is = urlConn.getInputStream(); |
| String contentEncoding = urlConn.getContentEncoding(); |
| if (contentEncoding == null) { |
| return is; |
| } |
| if ("gzip".equalsIgnoreCase(contentEncoding)) { |
| return new GZIPInputStream(is); |
| } |
| if ("deflate".equalsIgnoreCase(contentEncoding)) { |
| return new DeflaterInputStream(is); |
| } |
| // This should never happen |
| throw new IOException("Unsupported content encoding " + contentEncoding); |
| } |
| } |