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https://issues.apache.org/jira/browse/DRILL-3742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14952510#comment-14952510
]
ASF GitHub Bot commented on DRILL-3742:
---------------------------------------
Github user jacques-n commented on a diff in the pull request:
https://github.com/apache/drill/pull/148#discussion_r41718187
--- Diff:
common/src/main/java/org/apache/drill/common/scanner/ClassPathScanner.java ---
@@ -0,0 +1,458 @@
+/**
+ * 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.drill.common.scanner;
+
+import static java.lang.String.format;
+import static java.util.Arrays.asList;
+import static java.util.Collections.unmodifiableList;
+import static java.util.Collections.unmodifiableSet;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.drill.common.config.CommonConstants;
+import org.apache.drill.common.config.DrillConfig;
+import org.apache.drill.common.scanner.persistence.AnnotationDescriptor;
+import org.apache.drill.common.scanner.persistence.AttributeDescriptor;
+import org.apache.drill.common.scanner.persistence.ChildClassDescriptor;
+import org.apache.drill.common.scanner.persistence.FieldDescriptor;
+import org.apache.drill.common.scanner.persistence.FunctionDescriptor;
+import org.apache.drill.common.scanner.persistence.ParentClassDescriptor;
+import org.apache.drill.common.scanner.persistence.ScanResult;
+import org.reflections.Reflections;
+import org.reflections.adapters.JavassistAdapter;
+import org.reflections.scanners.AbstractScanner;
+import org.reflections.util.ConfigurationBuilder;
+import org.reflections.util.FilterBuilder;
+
+import com.google.common.base.Stopwatch;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Sets;
+
+import javassist.bytecode.AccessFlag;
+import javassist.bytecode.AnnotationsAttribute;
+import javassist.bytecode.ClassFile;
+import javassist.bytecode.FieldInfo;
+import javassist.bytecode.annotation.AnnotationMemberValue;
+import javassist.bytecode.annotation.ArrayMemberValue;
+import javassist.bytecode.annotation.BooleanMemberValue;
+import javassist.bytecode.annotation.ByteMemberValue;
+import javassist.bytecode.annotation.CharMemberValue;
+import javassist.bytecode.annotation.ClassMemberValue;
+import javassist.bytecode.annotation.DoubleMemberValue;
+import javassist.bytecode.annotation.EnumMemberValue;
+import javassist.bytecode.annotation.FloatMemberValue;
+import javassist.bytecode.annotation.IntegerMemberValue;
+import javassist.bytecode.annotation.LongMemberValue;
+import javassist.bytecode.annotation.MemberValue;
+import javassist.bytecode.annotation.MemberValueVisitor;
+import javassist.bytecode.annotation.ShortMemberValue;
+import javassist.bytecode.annotation.StringMemberValue;
+
+/**
+ * Classpath scanning utility.
+ * The classpath should be scanned once at startup from a DrillConfig
instance. {@see ClassPathScanner#fromPrescan(DrillConfig)}
+ * The DrillConfig provides the list of packages to scan.
(drill.classpath.scanning.packages) {@see
CommonConstants#IMPLEMENTATIONS_SCAN_PACKAGES}
+ * Only the class directories and jars containing a drill-module.conf will
be scanned.
+ * Drill core packages are scanned at build time and the result is saved
in a JSON file. {@see ClassPathScanner#FUNCTION_REGISTRY_FILE}
+ * At runtime only the packages that have not be scanned yet will be
scanned.
+ */
+public final class ClassPathScanner {
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(ClassPathScanner.class);
+ private static final JavassistAdapter METADATA_ADAPTER = new
JavassistAdapter();
+
+ /**
+ * defines all the things to scan for
+ */
+ private static final Set<String> SCANNED_CLASSES = unmodifiableSet(
+ new HashSet<>(asList(
+ "org.apache.drill.common.logical.data.LogicalOperator",
--- End diff --
move to configuration option
> Improve classpath scanning to reduce the time it takes
> ------------------------------------------------------
>
> Key: DRILL-3742
> URL: https://issues.apache.org/jira/browse/DRILL-3742
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Julien Le Dem
> Fix For: Future
>
>
> classpath scanning and function registry take a long time (seconds every
> time).
> We'd want to avoid loading the classes (use bytecode inspection instead) and
> have a build time cache to avoid doing the scanning at startup.
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