| /* |
| * 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.nifi.controller.status.history; |
| |
| import java.util.List; |
| |
| public abstract class AbstractMetricDescriptor<T> implements MetricDescriptor<T> { |
| private final IndexableMetric indexableMetric; |
| private final String field; |
| private final String label; |
| private final String description; |
| private final MetricDescriptor.Formatter formatter; |
| private final ValueMapper<T> valueMapper; |
| private final ValueReducer<StatusSnapshot, Long> reducer; |
| |
| public AbstractMetricDescriptor(final IndexableMetric indexableMetric, final String field, final String label, final String description, |
| final MetricDescriptor.Formatter formatter, final ValueMapper<T> valueFunction) { |
| this(indexableMetric, field, label, description, formatter, valueFunction, null); |
| } |
| |
| public AbstractMetricDescriptor(final IndexableMetric indexableMetric, final String field, final String label, final String description, |
| final MetricDescriptor.Formatter formatter, final ValueMapper<T> valueFunction, final ValueReducer<StatusSnapshot, Long> reducer) { |
| this.indexableMetric = indexableMetric; |
| this.field = field; |
| this.label = label; |
| this.description = description; |
| this.formatter = formatter; |
| this.valueMapper = valueFunction; |
| this.reducer = reducer == null ? new SumReducer() : reducer; |
| } |
| |
| @Override |
| public int getMetricIdentifier() { |
| return indexableMetric.getIndex(); |
| } |
| |
| @Override |
| public String getField() { |
| return field; |
| } |
| |
| @Override |
| public boolean isCounter() { |
| return false; |
| } |
| |
| @Override |
| public String getLabel() { |
| return label; |
| } |
| |
| @Override |
| public String getDescription() { |
| return description; |
| } |
| |
| @Override |
| public MetricDescriptor.Formatter getFormatter() { |
| return formatter; |
| } |
| |
| @Override |
| public ValueMapper<T> getValueFunction() { |
| return valueMapper; |
| } |
| |
| @Override |
| public ValueReducer<StatusSnapshot, Long> getValueReducer() { |
| return reducer; |
| } |
| |
| class SumReducer implements ValueReducer<StatusSnapshot, Long> { |
| |
| @Override |
| public Long reduce(final List<StatusSnapshot> values) { |
| long sum = 0; |
| for (final StatusSnapshot snapshot : values) { |
| sum += snapshot.getStatusMetric(AbstractMetricDescriptor.this); |
| } |
| |
| return sum; |
| } |
| } |
| } |