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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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.
 *
 * Original Work: MIT License, Copyright (c) [2015-2018] all contributors
 * https://github.com/marianobarrios/tls-channel
 */

package com.mongodb.internal.connection.tlschannel;

/**
 * This exception signals the caller that the operation could not continue
 * because a CPU-intensive operation (typically a TLS handshaking) needs to be
 * executed and the {@link TlsChannel} is configured to not run tasks.
 * This allows the application to run these tasks in some other threads, in
 * order to not slow the selection loop. The method that threw the exception
 * should be retried once the task supplied by {@link #getTask()} is executed
 * and finished.
 * 
 * This exception is akin to the SSL_ERROR_WANT_ASYNC error code used by OpenSSL
 * (but note that in OpenSSL, the task is executed by the library, while with
 * the {@link TlsChannel}, the calling code is responsible for the
 * execution).
 *
 * @see 
 * OpenSSL error documentation
 */
public class NeedsTaskException extends TlsChannelFlowControlException {

    private static final long serialVersionUID = -7869448883241411803L;

    private Runnable task;

    public NeedsTaskException(final Runnable task) {
        this.task = task;
    }

    public Runnable getTask() {
        return task;
    }

}