com.codebullets.sagalib.processing.invocation.SagaExecutionErrorsException Maven / Gradle / Ivy

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Java saga pattern library to organize and handle domain events.
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/*
 * Copyright 2016 Stefan Domnanovits
 *
 *  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.codebullets.sagalib.processing.invocation;

import java.util.ArrayList;
import java.util.Collection;

/**
 * This exception is thrown in case multiple errors have occurred when handling
 * a message. In case of a single error, the original exception is re-thrown as is.
 *
 * This encapsulated list might includes errors from executing saga as well
 * has module handlers.
 */
public class SagaExecutionErrorsException extends RuntimeException {
    private final Collection executionErrors;

    /**
     * Creates a new exceptions indicating multiple errors during sage handling.
     */
    public SagaExecutionErrorsException(final String message, final Collection errors) {
        super(encodeExceptionMessage(message, errors));
        this.executionErrors = new ArrayList<>(errors);
    }

    /**
     * Gets the list of encountered exceptions handling a message.
     */
    public Collection getExecutionErrors() {
        return executionErrors;
    }

    private static String encodeExceptionMessage(final String orgMessage, final Collection errors) {
        StringBuilder sb = new StringBuilder(orgMessage);
        sb.append(" [");

        boolean isFirst = true;
        for (Exception e : errors) {
            if (!isFirst) {
                sb.append(", ");
            }

            sb.append(e.getClass().getName());
            isFirst = false;
        }

        sb.append("]");
        return sb.toString();
    }

    /**
     * Checks the provided errors list for the number of instances.
     * If no error is reported does nothing. In case of a single error the
     * original exception is thrown, in case multiple errors, encapsulate
     * the list into a new thrown {@link SagaExecutionErrorsException}
     *
     * @throws Exception Throws the original exception or a new {@link SagaExecutionErrorsException}
     */
    public static void rethrowOrThrowIfMultiple(final String message, final Collection errors) throws Exception {
        int exceptionsCount = errors.size();
        switch (exceptionsCount) {
            case 0:
                // no error -> do nothing
                break;
            case 1:
                // single error -> rethrow original exception
                throw errors.iterator().next();
            default:
                throw new SagaExecutionErrorsException(message, errors);
        }
    }
}