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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS 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 2021 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:
 *
 *   https://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.codec.compression;

import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

public final class Zstd {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(Zstd.class);
    private static final Throwable cause;

    static {
        Throwable t = null;

        try {
            Class.forName("com.github.luben.zstd.Zstd", false,
                PlatformDependent.getClassLoader(Zstd.class));
        } catch (ClassNotFoundException e) {
            t = e;
            logger.debug(
                "zstd-jni not in the classpath; Zstd support will be unavailable.");
        }

        // If in the classpath, try to load the native library and initialize zstd.
        if (t == null) {
            try {
                com.github.luben.zstd.util.Native.load();
            } catch (Throwable e) {
                t = e;
                logger.debug("Failed to load zstd-jni; Zstd support will be unavailable.", t);
            }
        }
        cause = t;
    }

    /**
     *
     * @return true when zstd-jni is in the classpath
     * and native library is available on this platform and could be loaded
     */
    public static boolean isAvailable() {
        return cause == null;
    }

    /**
     * Throws when zstd support is missing from the classpath or is unavailable on this platform
     * @throws Throwable a ClassNotFoundException if zstd-jni is missing
     * or a ExceptionInInitializerError if zstd native lib can't be loaded
     */
    public static void ensureAvailability() throws Throwable {
        if (cause != null) {
            throw cause;
        }
    }

    /**
     * Returns {@link Throwable} of unavailability cause
     */
    public static Throwable cause() {
        return cause;
    }

    private Zstd() {
    }
}