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/*
 * Copyright 2021 Couchbase, 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.
 */
package com.couchbase.transactions.error.external;

import java.util.Collections;
import java.util.List;

/**
 * A previous operation in the application's lambda failed, and so the currently-attempt operation is also not
 * permitted to proceed.
 *
 * This is most likely thrown in one of these two scenarios:
 *
 * 1. The application is performing multiple operations in parallel and one of them has failed.  For performance it is
 *    best to fail all other operations immediately (the transaction is not going to commit anyway), so can get to the
 *    fail and possibly retry point as soon as possible.
 * 2. The application is erroneously catching and not propagating exceptions in the lambda.
 */
public class PreviousOperationFailed extends RuntimeException {
    private final List causes;

    public PreviousOperationFailed() {
        super("A previous operation failed, this attempt cannot proceed");
        causes = null;
    }

    public PreviousOperationFailed(List causes) {
        super("A previous operation failed, this attempt cannot proceed");
        this.causes = causes;
    }

    /**
     * Return the underlying causes for this failure
     */
    public List causes() {
        return causes == null ? Collections.EMPTY_LIST : causes;
    }
}