org.wildfly.galleon.plugin.server.ForkedProcessRunner Maven / Gradle / Ivy
/**
* 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.wildfly.galleon.plugin.server;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Map;
import java.util.Properties;
public class ForkedProcessRunner {
public static void main(String... args) {
try{
if(args.length < 2) {
throw new IllegalStateException("Expected at least two arguments but got " + Arrays.asList(args));
}
// set system properties
setSystemProps(args[0]);
Class cls;
try {
cls = Thread.currentThread().getContextClassLoader().loadClass(args[1]);
} catch (ClassNotFoundException e) {
throw new ConfigGeneratorException("Failed to locate the target class " + args[1], e);
}
/*if(!ForkCallback.class.isAssignableFrom(cls)) {
throw new ProvisioningException(args[1] + " does not implement " + ForkCallback.class.getName());
}*/
Object o;
try {
o = cls.newInstance();
} catch (Exception e) {
throw new ConfigGeneratorException("Failed to instantiate " + args[1], e);
}
((ForkCallback)o).forkedForEmbedded(args.length == 2 ? new String[0] : Arrays.copyOfRange(args, 2, args.length));
} catch (Throwable t) {
System.err.println("Forked embedded process has failed with the following error:");
t.printStackTrace(System.err);
System.exit(1);
}
}
private static void setSystemProps(String path) throws ConfigGeneratorException {
final Path props = Paths.get(path);
if(!Files.exists(props)) {
throw new ConfigGeneratorException("Failed to locate " + props.toAbsolutePath());
}
final Properties tmp = new Properties();
try(BufferedReader reader = Files.newBufferedReader(props)) {
tmp.load(reader);
} catch (IOException e) {
throw new ConfigGeneratorException( "Failed to read " + props.toAbsolutePath());
}
for(Map.Entry prop : tmp.entrySet()) {
final String current = System.getProperty(prop.getKey().toString());
if(current != null) {
// do not override the default properties
continue;
}
System.setProperty(prop.getKey().toString(), prop.getValue().toString());
}
}
}