| /* |
| * 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.nlpcraft.model.opencensus; |
| |
| import io.opencensus.trace.*; |
| import io.opencensus.trace.config.*; |
| import io.opencensus.trace.samplers.*; |
| import org.apache.nlpcraft.model.*; |
| import org.slf4j.*; |
| |
| /** |
| * Base class for OpenCensus trace exporters. |
| */ |
| public abstract class NCBaseTraceExporter implements NCLifecycle { |
| private final String name; |
| |
| protected static final Logger log = LoggerFactory.getLogger(NCBaseTraceExporter.class); |
| |
| /** |
| * New base tracer with given name. |
| * |
| * @param name Name of the exporter. |
| */ |
| public NCBaseTraceExporter(String name) { |
| this.name = name; |
| } |
| |
| /** |
| * Sets sampling for this trace exporter. Note that default implementation uses "always" sampling which |
| * is only suitable for demo and development purposes. For the production use you need to override this |
| * method and provide more efficient sampling strategy. |
| * |
| * @see Samplers |
| */ |
| protected void setSampling() { |
| TraceConfig cfg = Tracing.getTraceConfig(); |
| |
| cfg.updateActiveTraceParams(cfg.getActiveTraceParams().toBuilder().setSampler(Samplers.alwaysSample()).build()); |
| } |
| |
| @Override |
| public void onDiscard() { |
| Tracing.getExportComponent().shutdown(); |
| |
| log.info("{} OpenCensus trace exporter shutdown.", name); |
| } |
| } |
| |
| |