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A driver for Apache Cassandra 1.2+ that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol.

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/*
 *      Copyright (C) 2012-2015 DataStax 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.datastax.driver.core;

import com.datastax.driver.core.exceptions.DriverException;
import com.datastax.driver.core.exceptions.DriverInternalError;

import java.util.concurrent.ExecutionException;

class DriverThrowables {

    static RuntimeException propagateCause(ExecutionException e) {
        Throwable cause = e.getCause();

        if (cause instanceof Error)
            throw ((Error) cause);

        // We could just rethrow e.getCause(). However, the cause of the ExecutionException has likely been
        // created on the I/O thread receiving the response. Which means that the stacktrace associated
        // with said cause will make no mention of the current thread. This is painful for say, finding
        // out which execute() statement actually raised the exception. So instead, we re-create the
        // exception.
        if (cause instanceof DriverException)
            throw ((DriverException) cause).copy();
        else
            throw new DriverInternalError("Unexpected exception thrown", cause);
    }
}