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/*
* Copyright © 2016-2018 European Support Limited
*
* 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 org.onap.config.impl;
import java.io.File;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import org.apache.commons.configuration2.CombinedConfiguration;
import org.apache.commons.configuration2.CompositeConfiguration;
import org.apache.commons.configuration2.Configuration;
import org.apache.commons.configuration2.FileBasedConfiguration;
import org.apache.commons.configuration2.builder.BasicConfigurationBuilder;
import org.apache.commons.configuration2.builder.FileBasedConfigurationBuilder;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.onap.config.ConfigurationUtils;
import org.onap.config.Constants;
public final class ConfigurationRepository {
private static final ConfigurationRepository repo = new ConfigurationRepository();
private final Set<String> tenants = Collections.synchronizedSet(new HashSet<>());
private final Set<String> namespaces = Collections.synchronizedSet(new HashSet<>());
private final Map<String, ConfigurationHolder> store = Collections.synchronizedMap(
new LinkedHashMap<String, ConfigurationHolder>(16, 0.75f, true) {
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
try {
return size() > getConfigurationFor(Constants.DEFAULT_TENANT, Constants.DB_NAMESPACE)
.getInt("config.size.max");
} catch (Exception exception) {
return false;
}
}
});
private ConfigurationRepository() {
tenants.add(Constants.DEFAULT_TENANT);
namespaces.add(Constants.DEFAULT_NAMESPACE);
}
public static ConfigurationRepository lookup() {
return repo;
}
public Set<String> getTenants() {
return tenants;
}
public Set<String> getNamespaces() {
return namespaces;
}
public boolean isValidTenant(String tenant) {
return tenant != null && tenants.contains(tenant.toUpperCase());
}
public boolean isValidNamespace(String namespace) {
return namespace != null && namespaces.contains(namespace.toUpperCase());
}
public Configuration getConfigurationFor(String tenant, String namespace) throws Exception {
String module = tenant + Constants.KEY_ELEMENTS_DELIMITER + namespace;
ConfigurationHolder config = store.get(module);
return config.getConfiguration(tenant + Constants.KEY_ELEMENTS_DELIMITER + namespace);
}
public void populateConfiguration(String key, Configuration builder) {
store.put(key, new ConfigurationHolder(builder));
populateTenantsNamespace(key);
}
private void populateTenantsNamespace(String key) {
String[] array = key.split(Constants.KEY_ELEMENTS_DELIMITER);
if (!array[1].equalsIgnoreCase(Constants.DB_NAMESPACE)) {
tenants.add(array[0]);
namespaces.add(array[1]);
}
}
public void populateOverrideConfiguration(String key, File file) {
ConfigurationHolder holder = store.get(key);
if (holder == null) {
holder = new ConfigurationHolder(new CombinedConfiguration());
store.put(key, holder);
}
holder.addOverrideConfiguration(file.getAbsolutePath(), ConfigurationUtils.getConfigurationBuilder(file, true));
populateTenantsNamespace(key);
}
public void refreshOverrideConfigurationFor(String key, int index) {
ConfigurationHolder holder = store.get(key);
if (holder != null) {
holder.refreshOverrideConfiguration(index);
}
}
public void removeOverrideConfiguration(File file) {
for (String s : (Iterable<String>) new ArrayList(store.keySet())) {
ConfigurationHolder holder = store.get(s);
if (holder.containsOverrideConfiguration(file.getAbsolutePath())) {
holder.removeOverrideConfiguration(file.getAbsolutePath());
}
}
}
private class ConfigurationHolder {
private final Map<String, FileBasedConfigurationBuilder<FileBasedConfiguration>> overrideConfiguration =
new LinkedHashMap<>();
BasicConfigurationBuilder<Configuration> builder;
Timestamp lastConfigurationBuildTime;
Configuration config;
Configuration composite;
public ConfigurationHolder(BasicConfigurationBuilder builder) {
this.builder = builder;
}
public ConfigurationHolder(Configuration builder) {
this.config = builder;
}
public void refreshOverrideConfiguration(int index) {
int count = -1;
for (FileBasedConfigurationBuilder overrides : overrideConfiguration.values()) {
try {
if (++count == index) {
overrides.save();
overrides.resetResult();
}
} catch (ConfigurationException exception) {
//do nothing
}
}
}
public void addOverrideConfiguration(String path, BasicConfigurationBuilder<FileBasedConfiguration> builder) {
overrideConfiguration.put(path.toUpperCase(), (FileBasedConfigurationBuilder) builder);
getEffectiveConfiguration(config, overrideConfiguration.values());
}
private Configuration getEffectiveConfiguration(Configuration configuration,
Collection<FileBasedConfigurationBuilder<FileBasedConfiguration>> list) {
try {
CompositeConfiguration cc = new CompositeConfiguration();
for (FileBasedConfigurationBuilder<FileBasedConfiguration> b : list) {
cc.addConfiguration(b.getConfiguration());
}
cc.addConfiguration(configuration);
composite = cc;
return composite;
} catch (Exception exception) {
return null;
}
}
public void removeOverrideConfiguration(String path) {
overrideConfiguration.remove(path.toUpperCase());
getEffectiveConfiguration(config, overrideConfiguration.values());
}
public boolean containsOverrideConfiguration(String path) {
return overrideConfiguration.containsKey(path.toUpperCase());
}
public Configuration getConfiguration(String namespace) throws Exception {
if (config == null) {
config = builder.getConfiguration();
lastConfigurationBuildTime = new Timestamp(System.currentTimeMillis());
} else if (lastConfigurationBuildTime != null
&& System.currentTimeMillis() - lastConfigurationBuildTime.getTime()
> getConfigurationFor(Constants.DEFAULT_TENANT, Constants.DB_NAMESPACE)
.getInt("config.refresh.interval")) {
lastConfigurationBuildTime = new Timestamp(System.currentTimeMillis());
}
if (composite == null && overrideConfiguration.size() != 0) {
composite = getEffectiveConfiguration(config, overrideConfiguration.values());
}
return overrideConfiguration.size() == 0 ? config : composite;
}
}
}
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