| /* |
| * 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.cassandra.tools.nodetool.stats; |
| |
| import java.io.PrintStream; |
| import java.util.Map; |
| |
| import org.apache.cassandra.utils.JsonUtils; |
| import org.yaml.snakeyaml.DumperOptions; |
| import org.yaml.snakeyaml.Yaml; |
| |
| /** |
| * Interface for the Stats printer, that'd output statistics |
| * given the {@code StatsHolder} |
| * |
| * @param <T> Stats property bad type |
| */ |
| public interface StatsPrinter<T extends StatsHolder> |
| { |
| void print(T data, PrintStream out); |
| |
| static class JsonPrinter<T extends StatsHolder> implements StatsPrinter<T> |
| { |
| @Override |
| public void print(T data, PrintStream out) |
| { |
| // First need to get a Map representation of stats |
| final Map<String, Object> stats = data.convert2Map(); |
| // but then also need slight massaging to coerce NaN values into nulls |
| for (Object statEntry : stats.values()) |
| if (statEntry instanceof Map<?,?>) |
| for (Map.Entry<String, Object> entry : ((Map<String, Object>) statEntry).entrySet()) |
| if (entry.getValue() instanceof Double && !Double.isFinite((Double) entry.getValue())) |
| entry.setValue(null); |
| |
| // and then we can serialize |
| out.println(JsonUtils.writeAsPrettyJsonString(stats)); |
| } |
| } |
| |
| static class YamlPrinter<T extends StatsHolder> implements StatsPrinter<T> |
| { |
| @Override |
| public void print(T data, PrintStream out) |
| { |
| DumperOptions options = new DumperOptions(); |
| options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK); |
| |
| Yaml yaml = new Yaml(options); |
| out.println(yaml.dump(data.convert2Map())); |
| } |
| } |
| } |