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/*
 * 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.jackrabbit.oak.api.jmx;

import org.osgi.annotation.versioning.ProviderType;

@ProviderType
public interface QueryEngineSettingsMBean {
    String TYPE = "QueryEngineSettings";
    
    /**
     * Get the limit on how many nodes a query may read at most into memory, for
     * "order by" and "distinct" queries. If this limit is exceeded, the query
     * throws an exception.
     * 
     * @return the limit
     */
    @Description("Get the limit on how many nodes a query may read at most into memory, for " +
            "\"order by\" and \"distinct\" queries. If this limit is exceeded, the query throws an exception.")    
    long getLimitInMemory();
    
    /**
     * Change the limit.
     * 
     * @param limitInMemory the new limit
     */
    void setLimitInMemory(long limitInMemory);
    
    /**
     * Get the limit on how many nodes a query may read at most (raw read
     * operations, including skipped nodes). If this limit is exceeded, the
     * query throws an exception.
     * 
     * @return the limit
     */
    @Description("Get the limit on how many nodes a query may read at most (raw read " +
            "operations, including skipped nodes). If this limit is exceeded, the " +
            "query throws an exception.")    
    long getLimitReads();
    
    /**
     * Change the limit.
     * 
     * @param limitReads the new limit
     */
    void setLimitReads(long limitReads);
    
    /**
     * Whether queries that don't use an index will fail (throw an exception).
     * The default is false.
     * 
     * @return true if they fail
     */
    @Description("Whether queries that don't use an index will fail (throw an exception). " +
            "The default is false.")    
    boolean getFailTraversal();

    /**
     * Set whether queries that don't use an index will fail (throw an exception).
     * 
     * @param failTraversal the new value for this setting
     */
    void setFailTraversal(boolean failTraversal);

    /**
     * Whether the query result size should return an estimation for large queries.
     *
     * @return true if enabled
     */
    @Description("Whether the query result size should return an estimation for large queries.")    
    boolean isFastQuerySize();

    void setFastQuerySize(boolean fastQuerySize);

}