org.xnio.DefaultXnioWorkerHolder Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source
*
* Copyright 2017 Red Hat, Inc. and/or its affiliates.
*
* 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.xnio;
import static java.security.AccessController.doPrivileged;
import java.io.IOError;
import java.io.IOException;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import org.wildfly.client.config.ConfigXMLParseException;
import org.xnio._private.Messages;
final class DefaultXnioWorkerHolder {
static final XnioWorker INSTANCE;
static {
INSTANCE = doPrivileged((PrivilegedAction) () -> {
final Xnio xnio = Xnio.getInstance();
XnioWorker worker = null;
try {
worker = XnioXmlParser.parseWorker(xnio);
} catch (ConfigXMLParseException | IOException e) {
Messages.msg.trace("Failed to parse worker XML definition", e);
}
if (worker == null) {
final Iterator iterator = ServiceLoader.load(XnioWorkerConfigurator.class, DefaultXnioWorkerHolder.class.getClassLoader()).iterator();
while (worker == null) try {
if (! iterator.hasNext()) break;
final XnioWorkerConfigurator configurator = iterator.next();
if (configurator != null) try {
worker = configurator.createWorker();
} catch (IOException e) {
Messages.msg.trace("Failed to configure the default worker", e);
}
} catch (ServiceConfigurationError e) {
Messages.msg.trace("Failed to configure a service", e);
}
}
if (worker == null) try {
// create with defaults
worker = xnio.createWorker(OptionMap.create(Options.THREAD_DAEMON, Boolean.TRUE));
} catch (IOException e) {
throw new IOError(e);
}
return worker;
});
}
}