org.sonar.server.setting.ThreadLocalSettings Maven / Gradle / Ivy
/*
* SonarQube
* Copyright (C) 2009-2017 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.server.setting;
import com.google.common.annotations.VisibleForTesting;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Properties;
import org.apache.ibatis.exceptions.PersistenceException;
import org.sonar.api.CoreProperties;
import org.sonar.api.ce.ComputeEngineSide;
import org.sonar.api.config.Encryption;
import org.sonar.api.config.PropertyDefinitions;
import org.sonar.api.config.Settings;
import org.sonar.api.server.ServerSide;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Collections.unmodifiableMap;
import static java.util.Objects.requireNonNull;
/**
* Merge of system settings (including conf/sonar.properties) and the global properties stored
* in the db table "properties". These settings do not contain the settings specific to a project.
*
*
* System settings have precedence on others.
*
*
*
* The thread-local cache is optional. It is disabled when the method {@link #unload()} has not
* been called. That allows to remove complexity with handling of cleanup of thread-local cache
* on daemon threads (notifications) or startup "main" thread.
*
*/
@ComputeEngineSide
@ServerSide
public class ThreadLocalSettings extends Settings {
private final Properties systemProps;
private static final ThreadLocal> CACHE = new ThreadLocal<>();
private Map getPropertyDbFailureCache = Collections.emptyMap();
private Map getPropertiesDbFailureCache = Collections.emptyMap();
private SettingLoader settingLoader;
public ThreadLocalSettings(PropertyDefinitions definitions, Properties props) {
this(definitions, props, new NopSettingLoader());
}
@VisibleForTesting
ThreadLocalSettings(PropertyDefinitions definitions, Properties props, SettingLoader settingLoader) {
super(definitions, new Encryption(null));
this.settingLoader = settingLoader;
this.systemProps = new Properties();
props.forEach((k, v) -> systemProps.put(k, v == null ? null : v.toString().trim()));
// TODO something wrong about lifecycle here. It could be improved
getEncryption().setPathToSecretKey(props.getProperty(CoreProperties.ENCRYPTION_SECRET_KEY_PATH));
}
@VisibleForTesting
SettingLoader getSettingLoader() {
return settingLoader;
}
protected void setSettingLoader(SettingLoader settingLoader) {
this.settingLoader = Objects.requireNonNull(settingLoader);
}
@Override
protected Optional get(String key) {
// search for the first value available in
// 1. system properties
// 2. thread local cache (if enabled)
// 3. db
String value = systemProps.getProperty(key);
if (value != null) {
return Optional.of(value);
}
Map dbProps = CACHE.get();
// caching is disabled
if (dbProps == null) {
return Optional.ofNullable(load(key));
}
String loadedValue;
if (dbProps.containsKey(key)) {
// property may not exist in db. In this case key is present
// in cache but value is null
loadedValue = dbProps.get(key);
} else {
// cache the effective value (null if the property
// is not persisted)
loadedValue = load(key);
dbProps.put(key, loadedValue);
}
return Optional.ofNullable(loadedValue);
}
private String load(String key) {
try {
return settingLoader.load(key);
} catch (PersistenceException e) {
return getPropertyDbFailureCache.get(key);
}
}
@Override
protected void set(String key, String value) {
requireNonNull(key, "key can't be null");
requireNonNull(value, "value can't be null");
Map dbProps = CACHE.get();
if (dbProps != null) {
dbProps.put(key, value.trim());
}
}
@Override
protected void remove(String key) {
Map dbProps = CACHE.get();
if (dbProps != null) {
dbProps.remove(key);
}
}
/**
* Enables the thread specific cache of settings.
*
* @throws IllegalStateException if the current thread already has specific cache
*/
public void load() {
checkState(CACHE.get() == null,
"load called twice for thread '%s' or state wasn't cleared last time it was used", Thread.currentThread().getName());
CACHE.set(new HashMap<>());
}
/**
* Clears the cache specific to the current thread (if any).
*/
public void unload() {
Map settings = CACHE.get();
CACHE.remove();
// update cache of settings to be used in case of DB connectivity error
this.getPropertyDbFailureCache = settings;
}
@Override
public Map getProperties() {
Map result = new HashMap<>();
loadAll(result);
systemProps.forEach((key, value) -> result.put((String) key, (String) value));
return unmodifiableMap(result);
}
private void loadAll(Map appendTo) {
try {
Map cache = settingLoader.loadAll();
appendTo.putAll(cache);
getPropertiesDbFailureCache = cache;
} catch (PersistenceException e) {
appendTo.putAll(getPropertiesDbFailureCache);
}
}
}