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/*-
* ============LICENSE_START=======================================================
* policy-management
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.system;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Properties;
import org.onap.policy.drools.persistence.SystemPersistence;
import org.onap.policy.drools.utils.PropertyUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Programmatic entry point to the management layer
*/
public class Main {
/**
* logback configuration file system property
*/
public static final String LOGBACK_CONFIGURATION_FILE_SYSTEM_PROPERTY = "logback.configurationFile";
/**
* logback configuration file system property
*/
public static final String LOGBACK_CONFIGURATION_FILE_DEFAULT = "config/logback.xml";
/**
* constructor (hides public default one)
*/
private Main() {}
/**
* main
*
* @param args program arguments
* @throws IOException
*/
public static void main(String args[]) {
/* make sure the configuration directory exists */
Path configDir = Paths.get(SystemPersistence.CONFIG_DIR_NAME);
if (Files.notExists(configDir)) {
try {
Files.createDirectories(configDir);
} catch (IOException e) {
throw new IllegalStateException("cannot create " + SystemPersistence.CONFIG_DIR_NAME, e);
}
}
if (!Files.isDirectory(configDir))
throw new IllegalStateException
("config directory: " + configDir + " is not a directory");
/* logging defaults */
if (System.getProperty(LOGBACK_CONFIGURATION_FILE_SYSTEM_PROPERTY) == null)
System.setProperty(LOGBACK_CONFIGURATION_FILE_SYSTEM_PROPERTY, LOGBACK_CONFIGURATION_FILE_DEFAULT);
/* 0. boot */
PolicyEngine.manager.boot(args);
/* start logger */
Logger logger = LoggerFactory.getLogger(Main.class);
/* 1. Configure the Engine */
Path policyEnginePath = Paths.get(configDir.toString(), SystemPersistence.PROPERTIES_FILE_ENGINE);
try {
if (Files.exists(policyEnginePath))
PolicyEngine.manager.configure(PropertyUtil.getProperties(policyEnginePath.toFile()));
else
PolicyEngine.manager.configure(PolicyEngine.manager.defaultTelemetryConfig());
} catch (Exception e) {
logger.warn("Main: {} could not find custom configuration in {}.",
PolicyEngine.manager, SystemPersistence.PROPERTIES_FILE_ENGINE, e);
/* continue without telemetry or other custom components - this is OK */
}
/* 2. Start the Engine with the basic services only (no Policy Controllers) */
try {
boolean success = PolicyEngine.manager.start();
if (!success) {
logger.warn("Main: {} has been partially started", PolicyEngine.manager);
}
} catch (IllegalStateException e) {
logger.warn("Main: cannot start {} (bad state) because of {}", PolicyEngine.manager, e.getMessage(), e);
} catch (Exception e) {
logger.warn("Main: cannot start {} because of {}", PolicyEngine.manager, e.getMessage(), e);
System.exit(1);
}
/* 3. Create and start the controllers */
File[] controllerFiles = configDir.toFile().listFiles();
for (File config : controllerFiles) {
if (config.getName().endsWith(SystemPersistence.PROPERTIES_FILE_CONTROLLER_SUFFIX)) {
int idxSuffix =
config.getName().indexOf(SystemPersistence.PROPERTIES_FILE_CONTROLLER_SUFFIX);
int lastIdxSuffix =
config.getName().lastIndexOf(SystemPersistence.PROPERTIES_FILE_CONTROLLER_SUFFIX);
if (idxSuffix != lastIdxSuffix) {
throw new IllegalArgumentException
("Improper naming of controller properties file: " +
"Expected <controller-name>" +
SystemPersistence.PROPERTIES_FILE_CONTROLLER_SUFFIX);
}
String name =
config.getName().substring(0, lastIdxSuffix);
try {
Properties properties = PropertyUtil.getProperties(config);
PolicyController controller = PolicyEngine.manager.createPolicyController(name, properties);
controller.start();
} catch (Exception e) {
logger.error("Main: cannot instantiate policy-controller {} because of {}", name, e.getMessage(), e);
} catch (LinkageError e) {
logger.warn("Main: cannot instantiate policy-controller {} (linkage) because of {}",
name, e.getMessage(), e);
}
}
}
}
}
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