| /* |
| * 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.hadoop.metrics2; |
| |
| import org.apache.commons.lang.exception.ExceptionUtils; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.codehaus.jackson.map.ObjectMapper; |
| import org.codehaus.jackson.map.ObjectWriter; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| |
| /** |
| * Build a JSON dump of the metrics. |
| * |
| * The {@link #toString()} operator dumps out all values collected. |
| * |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class MetricsJsonBuilder extends MetricsRecordBuilder { |
| |
| public static final Logger LOG = LoggerFactory |
| .getLogger(MetricsRecordBuilder.class); |
| private final MetricsCollector parent; |
| private Map<String, Object> innerMetrics = new LinkedHashMap<>(); |
| |
| private static final ObjectWriter WRITER = |
| new ObjectMapper().writer(); |
| |
| /** |
| * Build an instance. |
| * @param parent parent collector. Unused in this instance; only used for |
| * the {@link #parent()} method |
| */ |
| public MetricsJsonBuilder(MetricsCollector parent) { |
| this.parent = parent; |
| } |
| |
| private MetricsRecordBuilder tuple(String key, Object value) { |
| innerMetrics.put(key, value); |
| return this; |
| } |
| |
| @Override |
| public MetricsRecordBuilder tag(MetricsInfo info, String value) { |
| return tuple(info.name(), value); |
| } |
| |
| @Override |
| public MetricsRecordBuilder add(MetricsTag tag) { |
| return tuple(tag.name(), tag.value()); |
| } |
| |
| @Override |
| public MetricsRecordBuilder add(AbstractMetric metric) { |
| return tuple(metric.info().name(), metric.toString()); |
| } |
| |
| @Override |
| public MetricsRecordBuilder setContext(String value) { |
| return tuple("context", value); |
| } |
| |
| @Override |
| public MetricsRecordBuilder addCounter(MetricsInfo info, int value) { |
| return tuple(info.name(), value); |
| } |
| |
| @Override |
| public MetricsRecordBuilder addCounter(MetricsInfo info, long value) { |
| return tuple(info.name(), value); |
| } |
| |
| @Override |
| public MetricsRecordBuilder addGauge(MetricsInfo info, int value) { |
| return tuple(info.name(), value); |
| } |
| |
| @Override |
| public MetricsRecordBuilder addGauge(MetricsInfo info, long value) { |
| return tuple(info.name(), value); |
| } |
| |
| @Override |
| public MetricsRecordBuilder addGauge(MetricsInfo info, float value) { |
| return tuple(info.name(), value); |
| } |
| |
| @Override |
| public MetricsRecordBuilder addGauge(MetricsInfo info, double value) { |
| return tuple(info.name(), value); |
| } |
| |
| @Override |
| public MetricsCollector parent() { |
| return parent; |
| } |
| |
| @Override |
| public String toString() { |
| try { |
| return WRITER.writeValueAsString(innerMetrics); |
| } catch (IOException e) { |
| LOG.warn("Failed to dump to Json.", e); |
| return ExceptionUtils.getStackTrace(e); |
| } |
| } |
| } |