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SCRIPTING: Move Aggregation Script Context to its own class (#33820)
* SCRIPTING: Move Aggregation Script Context to its own class
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...ession/src/main/java/org/elasticsearch/script/expression/ExpressionAggregationScript.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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.elasticsearch.script.expression; | ||
|
|
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| import java.io.IOException; | ||
| import org.apache.lucene.expressions.Bindings; | ||
| import org.apache.lucene.expressions.Expression; | ||
| import org.apache.lucene.expressions.SimpleBindings; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.search.DoubleValues; | ||
| import org.apache.lucene.search.DoubleValuesSource; | ||
| import org.elasticsearch.script.AggregationScript; | ||
| import org.elasticsearch.script.GeneralScriptException; | ||
|
|
||
| /** | ||
| * A bridge to evaluate an {@link Expression} against {@link Bindings} in the context | ||
| * of a {@link AggregationScript}. | ||
| */ | ||
| class ExpressionAggregationScript implements AggregationScript.LeafFactory { | ||
|
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| final Expression exprScript; | ||
| final SimpleBindings bindings; | ||
| final DoubleValuesSource source; | ||
| final ReplaceableConstDoubleValueSource specialValue; // _value | ||
|
|
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| ExpressionAggregationScript(Expression e, SimpleBindings b, ReplaceableConstDoubleValueSource v) { | ||
| exprScript = e; | ||
| bindings = b; | ||
| source = exprScript.getDoubleValuesSource(bindings); | ||
| specialValue = v; | ||
| } | ||
|
|
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| @Override | ||
| public AggregationScript newInstance(final LeafReaderContext leaf) throws IOException { | ||
| return new AggregationScript() { | ||
| // Fake the scorer until setScorer is called. | ||
| DoubleValues values = source.getValues(leaf, null); | ||
|
|
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| @Override | ||
| public Object execute() { | ||
| try { | ||
| return values.doubleValue(); | ||
| } catch (Exception exception) { | ||
| throw new GeneralScriptException("Error evaluating " + exprScript, exception); | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public void setDocument(int d) { | ||
| try { | ||
| values.advanceExact(d); | ||
| } catch (IOException e) { | ||
| throw new IllegalStateException("Can't advance to doc using " + exprScript, e); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void setNextAggregationValue(Object value) { | ||
| // _value isn't used in script if specialValue == null | ||
| if (specialValue != null) { | ||
| if (value instanceof Number) { | ||
| specialValue.setValue(((Number)value).doubleValue()); | ||
| } else { | ||
| throw new GeneralScriptException("Cannot use expression with text variable using " + exprScript); | ||
| } | ||
| } | ||
| } | ||
| }; | ||
| } | ||
|
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| @Override | ||
| public boolean needs_score() { | ||
| return false; | ||
| } | ||
|
|
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| } |
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165 changes: 165 additions & 0 deletions
165
server/src/main/java/org/elasticsearch/script/AggregationScript.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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.elasticsearch.script; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.search.Scorable; | ||
| import org.elasticsearch.ElasticsearchException; | ||
| import org.elasticsearch.common.lucene.ScorerAware; | ||
| import org.elasticsearch.index.fielddata.ScriptDocValues; | ||
| import org.elasticsearch.search.lookup.LeafSearchLookup; | ||
| import org.elasticsearch.search.lookup.SearchLookup; | ||
|
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| public abstract class AggregationScript implements ScorerAware { | ||
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| public static final String[] PARAMETERS = {}; | ||
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| public static final ScriptContext<Factory> CONTEXT = new ScriptContext<>("aggs", Factory.class); | ||
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| private static final Map<String, String> DEPRECATIONS; | ||
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| static { | ||
| Map<String, String> deprecations = new HashMap<>(); | ||
| deprecations.put( | ||
| "doc", | ||
| "Accessing variable [doc] via [params.doc] from within an aggregation-script " + | ||
| "is deprecated in favor of directly accessing [doc]." | ||
| ); | ||
| deprecations.put( | ||
| "_doc", | ||
| "Accessing variable [doc] via [params._doc] from within an aggregation-script " + | ||
| "is deprecated in favor of directly accessing [doc]." | ||
| ); | ||
| DEPRECATIONS = Collections.unmodifiableMap(deprecations); | ||
| } | ||
|
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| /** | ||
| * The generic runtime parameters for the script. | ||
| */ | ||
| private final Map<String, Object> params; | ||
|
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| /** | ||
| * A leaf lookup for the bound segment this script will operate on. | ||
| */ | ||
| private final LeafSearchLookup leafLookup; | ||
|
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| /** | ||
| * A scorer that will return the score for the current document when the script is run. | ||
| */ | ||
| protected Scorable scorer; | ||
|
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| private Object value; | ||
|
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| public AggregationScript(Map<String, Object> params, SearchLookup lookup, LeafReaderContext leafContext) { | ||
| this.params = new ParameterMap(new HashMap<>(params), DEPRECATIONS); | ||
| this.leafLookup = lookup.getLeafSearchLookup(leafContext); | ||
| this.params.putAll(leafLookup.asMap()); | ||
| } | ||
|
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| protected AggregationScript() { | ||
| params = null; | ||
| leafLookup = null; | ||
| } | ||
|
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| /** | ||
| * Return the parameters for this script. | ||
| */ | ||
| public Map<String, Object> getParams() { | ||
| return params; | ||
| } | ||
|
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| /** | ||
| * The doc lookup for the Lucene segment this script was created for. | ||
| */ | ||
| public Map<String, ScriptDocValues<?>> getDoc() { | ||
| return leafLookup.doc(); | ||
| } | ||
|
|
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| /** | ||
| * Set the current document to run the script on next. | ||
| */ | ||
| public void setDocument(int docid) { | ||
| leafLookup.setDocument(docid); | ||
| } | ||
|
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| @Override | ||
| public void setScorer(Scorable scorer) { | ||
| this.scorer = scorer; | ||
| } | ||
|
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| /** | ||
| * Sets per-document aggregation {@code _value}. | ||
| * <p> | ||
| * The default implementation just calls {@code setNextVar("_value", value)} but | ||
| * some engines might want to handle this differently for better performance. | ||
| * <p> | ||
| * @param value per-document value, typically a String, Long, or Double | ||
| */ | ||
| public void setNextAggregationValue(Object value) { | ||
| this.value = value; | ||
| } | ||
|
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| public Number get_score() { | ||
| try { | ||
| return scorer == null ? 0.0 : scorer.score(); | ||
| } catch (IOException e) { | ||
| throw new ElasticsearchException("couldn't lookup score", e); | ||
| } | ||
| } | ||
|
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| public Object get_value() { | ||
| return value; | ||
| } | ||
|
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| /** | ||
| * Return the result as a long. This is used by aggregation scripts over long fields. | ||
| */ | ||
| public long runAsLong() { | ||
| return ((Number) execute()).longValue(); | ||
| } | ||
|
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| public double runAsDouble() { | ||
| return ((Number) execute()).doubleValue(); | ||
| } | ||
|
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| public abstract Object execute(); | ||
|
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| /** | ||
| * A factory to construct {@link AggregationScript} instances. | ||
| */ | ||
| public interface LeafFactory { | ||
| AggregationScript newInstance(LeafReaderContext ctx) throws IOException; | ||
|
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| /** | ||
| * Return {@code true} if the script needs {@code _score} calculated, or {@code false} otherwise. | ||
| */ | ||
| boolean needs_score(); | ||
| } | ||
|
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| /** | ||
| * A factory to construct stateful {@link AggregationScript} factories for a specific index. | ||
| */ | ||
| public interface Factory { | ||
| LeafFactory newFactory(Map<String, Object> params, SearchLookup lookup); | ||
| } | ||
| } |
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