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/*
* Copyright (c) 2012, 2020 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018 Payara Services Ltd.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.grizzly;
import java.io.IOException;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.nio.channels.Channel;
import java.util.Random;
import org.glassfish.grizzly.nio.NIOTransport;
/**
* @since 2.2.19
*/
public abstract class AbstractBindingHandler implements SocketBinder {
protected static final Random RANDOM = new Random();
protected final NIOTransport transport;
protected Processor processor;
protected ProcessorSelector processorSelector;
// ------------------------------------------------------------ Constructors
public AbstractBindingHandler(final NIOTransport transport) {
this.transport = transport;
this.processor = transport.getProcessor();
this.processorSelector = transport.getProcessorSelector();
}
// ---------------------------------------------------------- Public Methods
/**
* Get the default {@link Processor} to process {@link IOEvent}, occurring on connection phase.
*
* @return the default {@link Processor} to process {@link IOEvent}, occurring on connection phase.
*/
public Processor getProcessor() {
return processor;
}
/**
* Set the default {@link Processor} to process {@link IOEvent}, occurring on connection phase.
*
* @param processor the default {@link Processor} to process {@link IOEvent}, occurring on connection phase.
*/
public void setProcessor(Processor processor) {
this.processor = processor;
}
/**
* Gets the default {@link ProcessorSelector}, which will be used to get {@link Processor} to process I/O events,
* occurring on connection phase.
*
* @return the default {@link ProcessorSelector}, which will be used to get {@link Processor} to process I/O events,
* occurring on connection phase.
*/
public ProcessorSelector getProcessorSelector() {
return processorSelector;
}
/**
* Sets the default {@link ProcessorSelector}, which will be used to get {@link Processor} to process I/O events,
* occurring on connection phase.
*
* @param processorSelector the default {@link ProcessorSelector}, which will be used to get {@link Processor} to
* process I/O events, occurring on connection phase.
*/
public void setProcessorSelector(final ProcessorSelector processorSelector) {
this.processorSelector = processorSelector;
}
// ----------------------------------------------- Methods from SocketBinder
/**
* {@inheritDoc}
*/
@Override
public Connection bind(final int port) throws IOException {
return bind(new InetSocketAddress(port));
}
/**
* {@inheritDoc}
*/
@Override
public Connection bind(final String host, final int port) throws IOException {
return bind(new InetSocketAddress(host, port));
}
/**
* {@inheritDoc}
*/
@Override
public Connection bind(final String host, final int port, final int backlog) throws IOException {
return bind(new InetSocketAddress(host, port), backlog);
}
/**
* {@inheritDoc}
*/
@Override
public Connection bind(final String host, final PortRange portRange, final int backlog) throws IOException {
return bind(host, portRange, true, backlog);
}
@Override
public Connection bind(final String host, final PortRange portRange, boolean randomStartPort, final int backlog) throws IOException {
// Get the initial range parameters
final int lower = portRange.getLower();
final int range = portRange.getUpper() - lower + 1;
// Select a start point in the range
final int initialOffset;
if (randomStartPort) {
initialOffset = RANDOM.nextInt(range);
} else {
initialOffset = 0;
}
// Loop the offset through all ports in the range and attempt
// to bind to each
int offset = initialOffset;
do {
final int port = lower + offset;
try {
return bind(host, port, backlog);
} catch (IOException caught) {
// Swallow exceptions until the end
}
offset = (offset + 1) % range;
} while (offset != initialOffset);
// If a port can't be bound, throw the exception
throw new BindException(String.format("Couldn't bind to any port in the range `%s`.", portRange.toString()));
}
/**
* This operation is not supported by implementations of {@link AbstractBindingHandler}.
*
* @throws UnsupportedOperationException by default
*/
@Override
public final void unbindAll() {
throw new UnsupportedOperationException();
}
// ------------------------------------------------------- Protected Methods
@SuppressWarnings("unchecked")
protected T getSystemInheritedChannel(final Class channelType) throws IOException {
final Channel inheritedChannel = System.inheritedChannel();
if (inheritedChannel == null) {
throw new IOException("Inherited channel is not set");
}
if (!channelType.isInstance(inheritedChannel)) {
throw new IOException("Inherited channel is not " + channelType.getName() + ", but " + inheritedChannel.getClass().getName());
}
return (T) inheritedChannel;
}
// ----------------------------------------------------------- Inner Classes
/**
* Builder
*
* @param
*/
@SuppressWarnings("unchecked")
public abstract static class Builder {
protected Processor processor;
protected ProcessorSelector processorSelector;
public E processor(final Processor processor) {
this.processor = processor;
return (E) this;
}
public E processorSelector(final ProcessorSelector processorSelector) {
this.processorSelector = processorSelector;
return (E) this;
}
public AbstractBindingHandler build() {
AbstractBindingHandler bindingHandler = create();
if (processor != null) {
bindingHandler.setProcessor(processor);
}
if (processorSelector != null) {
bindingHandler.setProcessorSelector(processorSelector);
}
return bindingHandler;
}
protected abstract AbstractBindingHandler create();
}
}
