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NameCache.java
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NameCache.java
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/*
* Copyright (c) 2022 nosqlbench
*
* 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.nosqlbench.cqlgen.transformers.namecache;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import io.nosqlbench.cqlgen.core.CGWorkloadExporter;
import io.nosqlbench.cqlgen.model.CqlKeyspaceDef;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.function.Function;
public class NameCache {
private final static Logger logger = LogManager.getLogger(CGWorkloadExporter.APPNAME+"/namecache");
private String path;
private final Map<String, NamedKeyspace> keyspaces = new LinkedHashMap();
public NamedKeyspace keyspace(String ksname) {
return keyspaces.computeIfAbsent(ksname, v -> new NamedKeyspace(ksname));
}
public NamedKeyspace computeAlias(CqlKeyspaceDef labeledKs, Function<CqlKeyspaceDef, String> ksfunc) {
return keyspaces.computeIfAbsent(
labeledKs.getName(),
ksname -> new NamedKeyspace(ksname)
.alias(ksfunc.apply(labeledKs)
));
}
public static NameCache loadOrCreate(Path path) {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
if (Files.exists(path)) {
BufferedReader reader = null;
try {
reader = Files.newBufferedReader(path);
} catch (IOException e) {
throw new RuntimeException(e);
}
NameCache nameCache = gson.fromJson(reader, NameCache.class);
nameCache.setPath(path.toString());
return nameCache;
} else {
return new NameCache().setPath(path.toString());
}
}
public NameCache setPath(String path) {
if (this.path!=null) {
if (this.path.equals(path)) {
logger.debug("mapfile unchanged '" + path + "'");
} else {
logger.info(() -> "mapfile changed from '" + this.path + "' to '" + path + "'");
this.path = path;
}
}
return this;
}
public NameCache Save() {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
String json = gson.toJson(this);
Path saveto = Path.of(this.path);
try {
Files.writeString(saveto, json);
} catch (IOException e) {
throw new RuntimeException(e);
}
return this;
}
public Collection<NamedKeyspace> keyspaces() {
return this.keyspaces.values();
}
}