/*
* Copyright 2017-present Facebook, Inc.
*
* 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 com.facebook.buck.rules;
import com.facebook.buck.io.ProjectFilesystem;
import com.facebook.buck.model.BuildTarget;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Map;
import java.util.Optional;
import org.mapdb.BTreeMap;
import org.mapdb.DB;
import org.mapdb.DBMaker;
import org.mapdb.Serializer;
public class MapDBBuildInfoStore implements BuildInfoStore {
private static final char KEY_SEP = ' ';
private static final char KEY_END = KEY_SEP + 1;
private final DB db;
private final BTreeMap<String, String> map;
public MapDBBuildInfoStore(ProjectFilesystem filesystem) {
Path dbPath =
filesystem
.getRootPath()
.resolve(filesystem.getBuckPaths().getScratchDir().resolve("metadata.db"));
db = DBMaker.fileDB(dbPath.toString()).fileMmapEnableIfSupported().transactionEnable().make();
map = db.treeMap("map", Serializer.STRING, Serializer.STRING).createOrOpen();
}
@Override
public void close() {
db.close();
}
@Override
public Optional<String> readMetadata(BuildTarget buildTarget, String key) {
String result = map.get(makeKey(buildTarget, key));
return Optional.ofNullable(result);
}
@Override
public void updateMetadata(BuildTarget buildTarget, Map<String, String> metadata)
throws IOException {
for (Map.Entry<String, String> entry : metadata.entrySet()) {
map.put(makeKey(buildTarget, entry.getKey()), entry.getValue());
}
}
@Override
public void deleteMetadata(BuildTarget buildTarget) throws IOException {
for (String key :
map.subMap(keyStart(buildTarget), true, keyEnd(buildTarget), false).keySet()) {
map.remove(key);
}
}
private static String makeKey(BuildTarget buildTarget, String key) {
return buildTarget.getFullyQualifiedName() + KEY_SEP + key;
}
private static String keyStart(BuildTarget buildTarget) {
return buildTarget.getFullyQualifiedName() + KEY_SEP;
}
private static String keyEnd(BuildTarget buildTarget) {
return buildTarget.getFullyQualifiedName() + KEY_END;
}
}