/*
 * 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.apache.shardingsphere.elasticjob.reg.exception;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;

import java.util.Collection;
import java.util.LinkedList;
import java.util.ServiceLoader;

/**
 * Registry center exception handler.
 */
@Slf4j
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class RegExceptionHandler {
    
    private static final Collection<Class<? extends Throwable>> IGNORED_EXCEPTIONS = new LinkedList<>();
    
    static {
        ServiceLoader.load(IgnoredExceptionProvider.class).forEach(each -> IGNORED_EXCEPTIONS.addAll(each.getIgnoredExceptions()));
    }
    
    /**
     * Handle exception.
     * 
     * @param cause exception to be handled
     */
    public static void handleException(final Exception cause) {
        if (null == cause) {
            return;
        }
        if (isIgnoredException(cause) || null != cause.getCause() && isIgnoredException(cause.getCause())) {
            log.debug("Elastic job: ignored exception for: {}", cause.getMessage());
        } else if (cause instanceof InterruptedException) {
            Thread.currentThread().interrupt();
        } else {
            throw new RegException(cause);
        }
    }
    
    private static boolean isIgnoredException(final Throwable cause) {
        return IGNORED_EXCEPTIONS.stream().anyMatch(each -> each.isInstance(cause));
    }
}
