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ingester-protocol/src/main/java/io/greptime/CachedPojoMapper.java
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| /* | ||
| * Copyright 2023 Greptime Team | ||
| * | ||
| * Licensed 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 io.greptime; | ||
|
|
||
| import com.google.common.cache.CacheBuilder; | ||
| import com.google.common.cache.CacheLoader; | ||
| import com.google.common.cache.LoadingCache; | ||
| import io.greptime.common.SPI; | ||
| import io.greptime.common.util.Ensures; | ||
| import io.greptime.errors.PojoException; | ||
| import io.greptime.models.Column; | ||
| import io.greptime.models.DataType; | ||
| import io.greptime.models.Metric; | ||
| import io.greptime.models.SemanticType; | ||
| import io.greptime.models.Table; | ||
| import io.greptime.models.TableSchema; | ||
| import java.lang.reflect.Field; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
||
| /** | ||
| * This utility class converts POJO objects into {@link Table} objects, | ||
| * inspired by <a href="https://github.com/influxdata/influxdb-client-java/blob/master/client/src/main/java/com/influxdb/client/internal/MeasurementMapper.java">InfluxDB client-java</a>. | ||
| * | ||
| * @author jiachun.fjc | ||
| */ | ||
| @SPI(priority = 9) | ||
| public class CachedPojoMapper implements PojoMapper { | ||
|
|
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| private final LoadingCache<Class<?>, Map<String, Field>> classFieldCache; | ||
|
|
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| public CachedPojoMapper() { | ||
| this(1024); | ||
| } | ||
|
|
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| public CachedPojoMapper(int maxCachedPOJOs) { | ||
| this.classFieldCache = | ||
| CacheBuilder.newBuilder().maximumSize(maxCachedPOJOs) | ||
| .build(new CacheLoader<Class<?>, Map<String, Field>>() { | ||
| @SuppressWarnings("NullableProblems") | ||
| @Override | ||
| public Map<String, Field> load(Class<?> key) { | ||
| return createMetricClass(key); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| @Override | ||
| public <M> Table mapToTable(List<M> pojos) { | ||
| Ensures.ensureNonNull(pojos, "pojos"); | ||
| Ensures.ensure(!pojos.isEmpty(), "pojos can not be empty"); | ||
|
|
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| M first = pojos.get(0); | ||
|
|
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| Class<?> metricType = first.getClass(); | ||
|
|
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| Map<String, Field> fieldMap = this.classFieldCache.getUnchecked(metricType); | ||
|
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| String metricName = getMetricName(metricType); | ||
|
|
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| TableSchema.Builder schemaBuilder = TableSchema.newBuilder(metricName); | ||
| for (Map.Entry<String, Field> entry : fieldMap.entrySet()) { | ||
| String name = entry.getKey(); | ||
| Field field = entry.getValue(); | ||
| Column column = field.getAnnotation(Column.class); | ||
| DataType dataType = column.dataType(); | ||
| SemanticType semanticType = SemanticType.Field; | ||
| if (column.tag()) { | ||
| semanticType = SemanticType.Tag; | ||
| } else if (column.timestamp()) { | ||
| semanticType = SemanticType.Timestamp; | ||
| } | ||
| schemaBuilder.addColumn(name, semanticType, dataType); | ||
| } | ||
|
|
||
| Table table = Table.from(schemaBuilder.build()); | ||
| for (M pojo : pojos) { | ||
| Class<?> type = pojo.getClass(); | ||
| if (!type.equals(metricType)) { | ||
| throw new PojoException("All POJOs must be of the same type"); | ||
| } | ||
|
|
||
| Object[] values = new Object[fieldMap.size()]; | ||
| int j = 0; | ||
| for (Map.Entry<String, Field> entry : fieldMap.entrySet()) { | ||
| Field field = entry.getValue(); | ||
| Object value = getObject(pojo, field); | ||
| values[j] = value; | ||
|
|
||
| j++; | ||
| } | ||
| table.addRow(values); | ||
| } | ||
|
|
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| return table; | ||
| } | ||
|
|
||
| private String getMetricName(Class<?> metricType) { | ||
| // From @Metric annotation | ||
| Metric metricAnnotation = metricType.getAnnotation(Metric.class); | ||
| if (metricAnnotation != null) { | ||
| return metricAnnotation.name(); | ||
| } else { | ||
| String err = | ||
| String.format("Unable to determine Metric for '%s'." + " Does it have a @Metric annotation?", | ||
| metricType); | ||
| throw new PojoException(err); | ||
| } | ||
| } | ||
|
|
||
| private <M> Object getObject(M metric, Field field) { | ||
| Object value; | ||
| try { | ||
| field.setAccessible(true); | ||
| value = field.get(metric); | ||
| } catch (IllegalAccessException e) { | ||
| throw new PojoException(e); | ||
| } | ||
| return value; | ||
| } | ||
|
|
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| private Map<String, Field> createMetricClass(Class<?> metricType) { | ||
| Map<String, Field> fieldMap = new HashMap<>(); | ||
| Class<?> currentType = metricType; | ||
| while (currentType != null) { | ||
| for (Field field : currentType.getDeclaredFields()) { | ||
| Column colAnnotation = field.getAnnotation(Column.class); | ||
| if (colAnnotation == null) { | ||
| continue; | ||
| } | ||
| fieldMap.put(colAnnotation.name(), field); | ||
| } | ||
| currentType = currentType.getSuperclass(); | ||
| } | ||
| return fieldMap; | ||
| } | ||
| } |
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ingester-protocol/src/main/resources/META-INF/services/io.greptime.PojoMapper
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1 @@ | ||
| io.greptime.CachedPojoMapper |
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