| /* |
| * Copyright 2017, OpenCensus Authors |
| * |
| * 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 io.opencensus.exporter.trace.logging; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import io.opencensus.trace.Tracing; |
| import io.opencensus.trace.export.SpanData; |
| import io.opencensus.trace.export.SpanExporter; |
| import io.opencensus.trace.export.SpanExporter.Handler; |
| import java.util.Collection; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import javax.annotation.concurrent.ThreadSafe; |
| |
| /** |
| * An OpenCensus span exporter implementation which logs all data. |
| * |
| * <p>Example of usage: |
| * |
| * <pre>{@code |
| * public static void main(String[] args) { |
| * LoggingTraceExporter.register(); |
| * ... // Do work. |
| * } |
| * }</pre> |
| * |
| * @since 0.12 |
| */ |
| @ThreadSafe |
| public final class LoggingTraceExporter { |
| private static final Logger logger = Logger.getLogger(LoggingTraceExporter.class.getName()); |
| private static final String REGISTER_NAME = LoggingTraceExporter.class.getName(); |
| private static final LoggingExporterHandler HANDLER = new LoggingExporterHandler(); |
| |
| private LoggingTraceExporter() {} |
| |
| /** |
| * Registers the Logging exporter to the OpenCensus library. |
| * |
| * @since 0.12 |
| */ |
| public static void register() { |
| register(Tracing.getExportComponent().getSpanExporter()); |
| } |
| |
| /** |
| * Registers the {@code LoggingHandler}. |
| * |
| * @param spanExporter the instance of the {@code SpanExporter} where this service is registered. |
| */ |
| @VisibleForTesting |
| static void register(SpanExporter spanExporter) { |
| spanExporter.registerHandler(REGISTER_NAME, HANDLER); |
| } |
| |
| /** |
| * Unregisters the Logging exporter from the OpenCensus library. |
| * |
| * @since 0.12 |
| */ |
| public static void unregister() { |
| unregister(Tracing.getExportComponent().getSpanExporter()); |
| } |
| |
| /** |
| * Unregisters the {@code LoggingHandler}. |
| * |
| * @param spanExporter the instance of the {@code SpanExporter} from where this service is |
| * unregistered. |
| */ |
| @VisibleForTesting |
| static void unregister(SpanExporter spanExporter) { |
| spanExporter.unregisterHandler(REGISTER_NAME); |
| } |
| |
| @VisibleForTesting |
| static final class LoggingExporterHandler extends Handler { |
| @Override |
| public void export(Collection<SpanData> spanDataList) { |
| // TODO(bdrutu): Use JSON as a standard format for logging SpanData and define this to be |
| // compatible between languages. |
| for (SpanData spanData : spanDataList) { |
| logger.log(Level.INFO, spanData.toString()); |
| } |
| } |
| } |
| } |