org.apache.kafka.streams.query.internals.FailedQueryResult Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.kafka.streams.query.internals;


import org.apache.kafka.streams.query.FailureReason;
import org.apache.kafka.streams.query.QueryResult;
import org.apache.kafka.streams.query.StateQueryRequest;

/**
 * Container for a single partition's result when executing a {@link StateQueryRequest}.
 *
 * @param  The result type of the query.
 */
public final class FailedQueryResult
    extends AbstractQueryResult
    implements QueryResult {

    private final FailureReason failureReason;
    private final String failure;

    public FailedQueryResult(final FailureReason failureReason, final String failure) {
        this.failureReason = failureReason;
        this.failure = failure;
    }

    /**
     * True iff the query was successfully executed. The response is available in {@link
     * this#getResult()}.
     */
    public boolean isSuccess() {
        return false;
    }


    /**
     * True iff the query execution failed. More information about the failure is available in
     * {@link this#getFailureReason()} and {@link this#getFailureMessage()}.
     */
    public boolean isFailure() {
        return true;
    }

    /**
     * If this partition failed to execute the query, returns the reason.
     *
     * @throws IllegalArgumentException if this is not a failed result.
     */
    public FailureReason getFailureReason() {
        return failureReason;
    }

    /**
     * If this partition failed to execute the query, returns the failure message.
     *
     * @throws IllegalArgumentException if this is not a failed result.
     */
    public String getFailureMessage() {
        return failure;
    }

    /**
     * Returns the result of executing the query on one partition. The result type is determined by
     * the query. Note: queries may choose to return {@code null} for a successful query, so {@link
     * this#isSuccess()} and {@link this#isFailure()} must be used to determine whether the query
     * was successful of failed on this partition.
     *
     * @throws IllegalArgumentException if this is not a successful query.
     */
    public R getResult() {
        throw new IllegalArgumentException(
            "Cannot get result for failed query. Failure is " + failureReason.name() + ": "
                + failure);
    }

    @Override
    public String toString() {
        return "FailedQueryResult{" +
            "failureReason=" + failureReason +
            ", failure='" + failure + '\'' +
            ", executionInfo=" + getExecutionInfo() +
            ", position=" + getPosition() +
            '}';
    }
}