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/*
* 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 java.net.URL;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
import org.apache.drill.common.config.DrillConfig;
import org.apache.drill.common.scanner.persistence.ScanResult;
/**
* Utility to scan classpath at runtime
*
*/
public class RunTimeScan {
/** result of prescan */
private static final ScanResult PRESCANNED = BuildTimeScan.load();
/** urls of the locations (classes directory or jar) to scan that don't have a registry in them */
private static final Collection<URL> NON_PRESCANNED_MARKED_PATHS = getNonPrescannedMarkedPaths();
/**
* @return getMarkedPaths() sans getPrescannedPaths()
*/
static Collection<URL> getNonPrescannedMarkedPaths() {
Collection<URL> markedPaths = ClassPathScanner.getMarkedPaths();
markedPaths.removeAll(BuildTimeScan.getPrescannedPaths());
return markedPaths;
}
/**
* loads prescanned classpath info and scans for extra ones based on configuration.
* (unless prescan is disabled with {@see ClassPathScanner#IMPLEMENTATIONS_SCAN_CACHE}=falses)
* @param config to retrieve the packages to scan
* @return the scan result
*/
public static ScanResult fromPrescan(DrillConfig config) {
List<String> packagePrefixes = ClassPathScanner.getPackagePrefixes(config);
List<String> scannedBaseClasses = ClassPathScanner.getScannedBaseClasses(config);
List<String> scannedAnnotations = ClassPathScanner.getScannedAnnotations(config);
if (ClassPathScanner.isScanBuildTimeCacheEnabled(config)) {
// scan only locations that have not been scanned yet
ScanResult runtimeScan = ClassPathScanner.scan(
NON_PRESCANNED_MARKED_PATHS,
packagePrefixes,
scannedBaseClasses,
scannedAnnotations,
PRESCANNED);
return runtimeScan.merge(PRESCANNED);
} else {
// scan everything
return ClassPathScanner.scan(
ClassPathScanner.getMarkedPaths(),
packagePrefixes,
scannedBaseClasses,
scannedAnnotations,
ClassPathScanner.emptyResult());
}
}
/**
* Scans packages retrieved from config.
* Returns scan result with list of packages, classes and annotations found.
* Is used to scan specific jars not associated with classpath at runtime.
*
* @param config to retrieve the packages to scan
* @param markedPath list of paths where to scan
* @return the scan result with list of packages, classes and annotations found
*/
public static ScanResult dynamicPackageScan(DrillConfig config, Set<URL> markedPath) {
List<String> packagePrefixes = ClassPathScanner.getPackagePrefixes(config);
return ClassPathScanner.scan(
markedPath,
packagePrefixes,
Lists.<String>newArrayList(),
PRESCANNED.getScannedAnnotations(),
ClassPathScanner.emptyResult());
}
}
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