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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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 io.netty.handler.ssl;

import static io.netty.util.internal.ObjectUtil.checkNotNull;
import io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelectionListener;
import io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelector;
import io.netty.util.internal.PlatformDependent;

import java.util.HashSet;
import java.util.List;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLException;

import org.eclipse.jetty.alpn.ALPN;
import org.eclipse.jetty.alpn.ALPN.ClientProvider;
import org.eclipse.jetty.alpn.ALPN.ServerProvider;

final class JdkAlpnSslEngine extends JdkSslEngine {
    private static boolean available;

    static boolean isAvailable() {
        updateAvailability();
        return available;
    }

    private static void updateAvailability() {
        if (available) {
            return;
        }

        try {
            // Try to get the bootstrap class loader.
            ClassLoader bootloader = ClassLoader.getSystemClassLoader().getParent();
            if (bootloader == null) {
                // If failed, use the system class loader,
                // although it's not perfect to tell if APLN extension has been loaded.
                bootloader = ClassLoader.getSystemClassLoader();
            }
            Class.forName("sun.security.ssl.ALPNExtension", true, bootloader);
            available = true;
        } catch (Exception ignore) {
            // alpn-boot was not loaded.
        }
    }

    JdkAlpnSslEngine(SSLEngine engine, final JdkApplicationProtocolNegotiator applicationNegotiator, boolean server) {
        super(engine);
        checkNotNull(applicationNegotiator, "applicationNegotiator");

        if (server) {
            final ProtocolSelector protocolSelector = checkNotNull(applicationNegotiator.protocolSelectorFactory()
                    .newSelector(this, new HashSet(applicationNegotiator.protocols())), "protocolSelector");
            ALPN.put(engine, new ServerProvider() {
                @Override
                public String select(List protocols) {
                    try {
                        return protocolSelector.select(protocols);
                    } catch (Throwable t) {
                        PlatformDependent.throwException(t);
                        return null;
                    }
                }

                @Override
                public void unsupported() {
                    protocolSelector.unsupported();
                }
            });
        } else {
            final ProtocolSelectionListener protocolListener = checkNotNull(applicationNegotiator
                    .protocolListenerFactory().newListener(this, applicationNegotiator.protocols()),
                    "protocolListener");
            ALPN.put(engine, new ClientProvider() {
                @Override
                public List protocols() {
                    return applicationNegotiator.protocols();
                }

                @Override
                public void selected(String protocol) {
                    try {
                        protocolListener.selected(protocol);
                    } catch (Throwable t) {
                        PlatformDependent.throwException(t);
                    }
                }

                @Override
                public void unsupported() {
                    protocolListener.unsupported();
                }
            });
        }
    }

    @Override
    public void closeInbound() throws SSLException {
        ALPN.remove(getWrappedEngine());
        super.closeInbound();
    }

    @Override
    public void closeOutbound() {
        ALPN.remove(getWrappedEngine());
        super.closeOutbound();
    }
}