| /* |
| * 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.druid.segment; |
| |
| import org.apache.druid.common.utils.SerializerUtils; |
| import org.apache.druid.java.util.common.ISE; |
| import org.apache.druid.segment.data.CompressedColumnarFloatsSupplier; |
| import org.apache.druid.segment.data.GenericIndexed; |
| import org.apache.druid.segment.serde.ComplexMetricSerde; |
| import org.apache.druid.segment.serde.ComplexMetrics; |
| |
| import javax.annotation.Nullable; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| |
| /** |
| */ |
| public class MetricHolder |
| { |
| private static final byte[] VERSION = new byte[]{0x0}; |
| private static final SerializerUtils SERIALIZER_UTILS = new SerializerUtils(); |
| |
| public static MetricHolder fromByteBuffer(ByteBuffer buf) |
| { |
| final byte ver = buf.get(); |
| if (VERSION[0] != ver) { |
| throw new ISE("Unknown version[%s] of MetricHolder", ver); |
| } |
| |
| final String metricName = SERIALIZER_UTILS.readString(buf); |
| final String typeName = SERIALIZER_UTILS.readString(buf); |
| MetricHolder holder = new MetricHolder(metricName, typeName); |
| |
| switch (holder.type) { |
| case FLOAT: |
| holder.floatType = CompressedColumnarFloatsSupplier.fromByteBuffer(buf, ByteOrder.nativeOrder()); |
| break; |
| case COMPLEX: |
| final ComplexMetricSerde serdeForType = ComplexMetrics.getSerdeForType(holder.getTypeName()); |
| |
| if (serdeForType == null) { |
| throw new ISE("Unknown type[%s], cannot load.", holder.getTypeName()); |
| } |
| |
| holder.complexType = read(buf, serdeForType); |
| break; |
| case LONG: |
| case DOUBLE: |
| throw new ISE("Unsupported type[%s]", holder.type); |
| } |
| |
| return holder; |
| } |
| |
| private static <T> GenericIndexed<T> read(ByteBuffer buf, ComplexMetricSerde serde) |
| { |
| return GenericIndexed.read(buf, serde.getObjectStrategy()); |
| } |
| |
| public enum MetricType |
| { |
| LONG, |
| FLOAT, |
| DOUBLE, |
| COMPLEX; |
| |
| static MetricType determineType(String typeName) |
| { |
| if ("long".equalsIgnoreCase(typeName)) { |
| return LONG; |
| } else if ("float".equalsIgnoreCase(typeName)) { |
| return FLOAT; |
| } else if ("double".equalsIgnoreCase(typeName)) { |
| return DOUBLE; |
| } |
| return COMPLEX; |
| } |
| } |
| |
| private final String name; |
| private final String typeName; |
| private final MetricType type; |
| @Nullable |
| CompressedColumnarFloatsSupplier floatType = null; |
| @Nullable |
| GenericIndexed<?> complexType = null; |
| |
| private MetricHolder( |
| String name, |
| String typeName |
| ) |
| { |
| this.name = name; |
| this.typeName = typeName; |
| this.type = MetricType.determineType(typeName); |
| } |
| |
| public String getName() |
| { |
| return name; |
| } |
| |
| public String getTypeName() |
| { |
| return typeName; |
| } |
| |
| public MetricType getType() |
| { |
| return type; |
| } |
| |
| } |