/*
* 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.nifi.util;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.nifi.registry.VariableDescriptor;
import org.apache.nifi.registry.VariableRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A file based variable registry that loads all properties from files specified
* during construction and is backed by system properties and environment
* variables accessible to the JVM.
*/
public class FileBasedVariableRegistry implements VariableRegistry {
private final static Logger LOG = LoggerFactory.getLogger(FileBasedVariableRegistry.class);
final Map<VariableDescriptor, String> map;
public FileBasedVariableRegistry(final Path[] propertiesPaths) {
final Map<VariableDescriptor, String> newMap = new HashMap<>(VariableRegistry.ENVIRONMENT_SYSTEM_REGISTRY.getVariableMap());
final int systemEnvPropCount = newMap.size();
int totalPropertiesLoaded = systemEnvPropCount;
LOG.info("Loaded {} properties from system properties and environment variables",systemEnvPropCount);
try {
for (final Path path : propertiesPaths) {
if (Files.exists(path)) {
final AtomicInteger propsLoaded = new AtomicInteger(0);
try (final InputStream inStream = new BufferedInputStream(new FileInputStream(path.toFile()))) {
Properties properties = new Properties();
properties.load(inStream);
properties.entrySet().stream().forEach((entry) -> {
final VariableDescriptor desc = new VariableDescriptor.Builder(entry.getKey().toString())
.description(path.toString())
.sensitive(false)
.build();
newMap.put(desc, entry.getValue().toString());
propsLoaded.incrementAndGet();
});
}
totalPropertiesLoaded += propsLoaded.get();
if(propsLoaded.get() > 0){
LOG.info("Loaded {} properties from '{}'", propsLoaded.get(), path);
}else{
LOG.warn("No properties loaded from '{}'", path);
}
} else {
LOG.warn("Skipping property file {} as it does not appear to exist", path);
}
}
} catch (final IOException ioe) {
LOG.error("Unable to complete variable registry loading from files due to ", ioe);
}
LOG.info("Loaded a total of {} properties. Including precedence overrides effective accessible registry key size is {}", totalPropertiesLoaded, newMap.size());
map = newMap;
}
@Override
public Map<VariableDescriptor, String> getVariableMap() {
return Collections.unmodifiableMap(map);
}
}