| /* |
| * 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.solr.cluster.placement.impl; |
| |
| import org.apache.solr.cluster.placement.Metric; |
| |
| import java.util.Objects; |
| import java.util.function.Function; |
| |
| /** |
| * Base class for {@link Metric} implementations. |
| */ |
| public abstract class MetricImpl<T> implements Metric<T> { |
| |
| public static final double GB = 1024 * 1024 * 1024; |
| |
| /** |
| * Identity converter. It returns the raw value unchanged IFF |
| * the value's type can be cast to the generic type of this attribute, |
| * otherwise it returns null. |
| */ |
| @SuppressWarnings("unchecked") |
| public final Function<Object, T> IDENTITY_CONVERTER = v -> { |
| try { |
| return (T) v; |
| } catch (ClassCastException cce) { |
| return null; |
| } |
| }; |
| |
| /** |
| * Bytes to gigabytes converter. Supports converting number or string |
| * representations of raw values expressed in bytes. |
| */ |
| @SuppressWarnings("unchecked") |
| public static final Function<Object, Double> BYTES_TO_GB_CONVERTER = v -> { |
| double sizeInBytes; |
| if (!(v instanceof Number)) { |
| if (v == null) { |
| return null; |
| } |
| try { |
| sizeInBytes = Double.parseDouble(String.valueOf(v)); |
| } catch (Exception nfe) { |
| return null; |
| } |
| } else { |
| sizeInBytes = ((Number) v).doubleValue(); |
| } |
| return sizeInBytes / GB; |
| }; |
| |
| protected final String name; |
| protected final String internalName; |
| protected final Function<Object, T> converter; |
| |
| /** |
| * Create a metric attribute. |
| * @param name short-hand name that identifies this attribute. |
| * @param internalName internal name of a Solr metric. |
| */ |
| public MetricImpl(String name, String internalName) { |
| this(name, internalName, null); |
| } |
| |
| /** |
| * Create a metric attribute. |
| * @param name short-hand name that identifies this attribute. |
| * @param internalName internal name of a Solr metric. |
| * @param converter optional raw value converter. If null then |
| * {@link #IDENTITY_CONVERTER} will be used. |
| */ |
| public MetricImpl(String name, String internalName, Function<Object, T> converter) { |
| Objects.requireNonNull(name); |
| Objects.requireNonNull(internalName); |
| this.name = name; |
| this.internalName = internalName; |
| if (converter == null) { |
| this.converter = IDENTITY_CONVERTER; |
| } else { |
| this.converter = converter; |
| } |
| } |
| |
| @Override |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public String getInternalName() { |
| return internalName; |
| } |
| |
| @Override |
| public T convert(Object value) { |
| return converter.apply(value); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| MetricImpl<?> that = (MetricImpl<?>) o; |
| return name.equals(that.getName()) && internalName.equals(that.getInternalName()) && converter.equals(that.converter); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(name, internalName, converter); |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + "{" + |
| "name=" + name + |
| ", internalName=" + internalName + |
| "}"; |
| } |
| } |