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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
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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.cassandra.cql3;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;

import javax.annotation.Nullable;

import com.google.common.annotations.VisibleForTesting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.cql3.statements.AuthenticationStatement;
import org.apache.cassandra.cql3.statements.BatchStatement;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.transport.Message;
import org.apache.cassandra.transport.messages.ResultMessage;
import org.apache.cassandra.utils.JVMStabilityInspector;
import org.apache.cassandra.utils.NoSpamLogger;

public class QueryEvents
{
    private static final Logger logger = LoggerFactory.getLogger(QueryEvents.class);
    private static final NoSpamLogger noSpam1m = NoSpamLogger.getLogger(logger, 1, TimeUnit.MINUTES);
    public static final QueryEvents instance = new QueryEvents();

    private final Set listeners = new CopyOnWriteArraySet<>();

    private final PasswordObfuscator passwordObfuscator = new PasswordObfuscator();

    @VisibleForTesting
    public int listenerCount()
    {
        return listeners.size();
    }

    @VisibleForTesting
    public PasswordObfuscator getObfuscator()
    {
        return passwordObfuscator;
    }

    public void registerListener(Listener listener)
    {
        listeners.add(listener);
    }

    public void unregisterListener(Listener listener)
    {
        listeners.remove(listener);
    }

    public void notifyQuerySuccess(CQLStatement statement,
                                   String query,
                                   QueryOptions options,
                                   QueryState state,
                                   long queryTime,
                                   Message.Response response)
    {
        try
        {
            final String possiblyObfuscatedQuery = listeners.size() > 0 ? possiblyObfuscateQuery(statement, query) : query;
            for (Listener listener : listeners)
                listener.querySuccess(statement, possiblyObfuscatedQuery, options, state, queryTime, response);
        }
        catch (Throwable t)
        {
            noSpam1m.error("Failed notifying listeners", t);
            JVMStabilityInspector.inspectThrowable(t);
        }
    }

    public void notifyQueryFailure(CQLStatement statement,
                                   String query,
                                   QueryOptions options,
                                   QueryState state,
                                   Exception cause)
    {
        try
        {
            final String possiblyObfuscatedQuery = listeners.size() > 0 ? possiblyObfuscateQuery(statement, query) : query;
            for (Listener listener : listeners)
                listener.queryFailure(statement, possiblyObfuscatedQuery, options, state, cause);
        }
        catch (Throwable t)
        {
            noSpam1m.error("Failed notifying listeners", t);
            JVMStabilityInspector.inspectThrowable(t);
        }
    }

    public void notifyExecuteSuccess(CQLStatement statement,
                                     String query,
                                     QueryOptions options,
                                     QueryState state,
                                     long queryTime,
                                     Message.Response response)
    {
        try
        {
            final String possiblyObfuscatedQuery = listeners.size() > 0 ? possiblyObfuscateQuery(statement, query) : query;
            for (Listener listener : listeners)
                listener.executeSuccess(statement, possiblyObfuscatedQuery, options, state, queryTime, response);
        }
        catch (Throwable t)
        {
            noSpam1m.error("Failed notifying listeners", t);
            JVMStabilityInspector.inspectThrowable(t);
        }
    }

    public void notifyExecuteFailure(QueryHandler.Prepared prepared,
                                     QueryOptions options,
                                     QueryState state,
                                     Exception cause)
    {
        CQLStatement statement = prepared != null ? prepared.statement : null;
        String query = prepared != null ? prepared.rawCQLStatement : null;
        try
        {
            final String possiblyObfuscatedQuery = listeners.size() > 0 ? possiblyObfuscateQuery(statement, query) : query;
            for (Listener listener : listeners)
                listener.executeFailure(statement, possiblyObfuscatedQuery, options, state, cause);
        }
        catch (Throwable t)
        {
            noSpam1m.error("Failed notifying listeners", t);
            JVMStabilityInspector.inspectThrowable(t);
        }
    }

    public void notifyBatchSuccess(BatchStatement.Type batchType,
                                   List statements,
                                   List queries,
                                   List> values,
                                   QueryOptions options,
                                   QueryState state,
                                   long queryTime,
                                   Message.Response response)
    {
        try
        {
            for (Listener listener : listeners)
                listener.batchSuccess(batchType, statements, queries, values, options, state, queryTime, response);
        }
        catch (Throwable t)
        {
            noSpam1m.error("Failed notifying listeners", t);
            JVMStabilityInspector.inspectThrowable(t);
        }
    }

    public void notifyBatchFailure(List prepared,
                                   BatchStatement.Type batchType,
                                   List