org.kududb.client.NoLeaderMasterFoundException.java Source code

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Here is the source code for org.kududb.client.NoLeaderMasterFoundException.java

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// Copyright 2015 Cloudera, 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 org.kududb.client;

import com.google.common.base.Functions;
import com.google.common.base.Joiner;
import com.google.common.collect.Lists;
import org.kududb.annotations.InterfaceAudience;
import org.kududb.annotations.InterfaceStability;

import java.util.List;

/**
 * Indicates that the request failed because we couldn't find a leader master server.
 */
@InterfaceAudience.Public
@InterfaceStability.Evolving
public final class NoLeaderMasterFoundException extends RecoverableException {

    NoLeaderMasterFoundException(final String msg) {
        super(msg);
    }

    NoLeaderMasterFoundException(final String msg, final Exception cause) {
        super(msg, cause);
    }

    /**
     * Factory method that creates a NoLeaderException given a message and a list
     * (which may be empty, but must be initialized) of exceptions encountered: they indicate
     * why {@link GetMasterRegistrationRequest} calls to the masters in the config
     * have failed, to aid in debugging the issue. If the list is non-empty, each exception's
     * 'toString()' message is appended to 'msg' and the last exception is used as the
     * cause for the exception.
     * @param msg A message detailing why this exception occured.
     * @param causes List of exceptions encountered when retrieving registration from individual
     *               masters.
     * @return An instantiated NoLeaderMasterFoundException which can be thrown.
     */
    static NoLeaderMasterFoundException create(String msg, List<Exception> causes) {
        if (causes.isEmpty()) {
            return new NoLeaderMasterFoundException(msg);
        }
        String joinedMsg = msg + ". Exceptions received: "
                + Joiner.on(",").join(Lists.transform(causes, Functions.toStringFunction()));
        return new NoLeaderMasterFoundException(joinedMsg, causes.get(causes.size() - 1));
    }
}