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/*
 * (c) Copyright 2022 Palantir Technologies Inc. All rights reserved.
 *
 * 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.palantir.atlasdb.keyvalue.cassandra.async;

import com.google.common.util.concurrent.ListenableFuture;
import com.palantir.atlasdb.keyvalue.cassandra.async.queries.CqlQuerySpec;
import com.palantir.logsafe.exceptions.SafeIllegalStateException;

public class ThrowingCqlClient implements CqlClient {
    private static final ThrowingCqlClient INSTANCE = new ThrowingCqlClient();

    @Override
    public  ListenableFuture executeQuery(CqlQuerySpec querySpec) {
        throw new SafeIllegalStateException(
                "The CQL config is invalid or not present. If intending to use CQL Clients (Async KVS) please ensure"
                        + " you have AtlasDB to use CQL, and that the configured set of CQL hosts match the set of"
                        + " Thrift hosts.");
    }

    public static ThrowingCqlClient of() {
        return INSTANCE;
    }

    @Override
    public void close() {
        // no-op, nothing to close
    }

    @Override
    public boolean isValid() {
        return false;
    }
}