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// Portions Copyright [2016] [Payara Foundation and/or its affiliates]

package com.sun.gjc.util;

import java.util.Comparator;

/**
 * Store the sql queries executed by applications along with the number of
 * times executed and the time stamp of the last usage.
 * Used for monitoring information.
 * 
 * @author Shalini M
 */
public class SQLTrace {

    private String queryName;
    private int numExecutions;
    private long lastUsageTime;

    public SQLTrace(String query, int numExecutions, long time) {
        this.queryName = query;
        this.numExecutions = numExecutions;
        this.lastUsageTime = time;
    }
    
    /**
     * Get the value of queryName
     *
     * @return the value of queryName
     */
    public String getQueryName() {
        return queryName;
    }

    /**
     * Set the value of queryName
     *
     * @param queryName new value of queryName
     */
    public void setQueryName(String queryName) {
        this.queryName = queryName;
    }

    /**
     * Get the value of numExecutions
     *
     * @return the value of numExecutions
     */
    public int getNumExecutions() {
        return numExecutions;
    }

    /**
     * Set the value of numExecutions
     *
     * @param numExecutions new value of numExecutions
     */
    public void setNumExecutions(int numExecutions) {
        this.numExecutions = numExecutions;
    }

    /**
     * Get the value of lastUsageTime
     *
     * @return the value of lastUsageTime
     */
    public long getLastUsageTime() {
        return lastUsageTime;
    }

    /**
     * Set the value of lastUsageTime
     *
     * @param lastUsageTime new value of lastUsageTime
     */
    public void setLastUsageTime(long lastUsageTime) {
        this.lastUsageTime = lastUsageTime;
    }
    
    // Comparator that orders based upon the number of executions and the last usage time.
    public static Comparator SQLTraceFrequencyComparator = new Comparator() {
        
        @Override
        public int compare(SQLTrace sqlTrace1, SQLTrace sqlTrace2) {
            final int sqlTrace1Frequency = sqlTrace1.getNumExecutions();
            final int sqlTrace2Frequency = sqlTrace2.getNumExecutions();
            
            // Initialise the comparison variable to be equal
            int compare = 0;
            
            // Compare the number of executions
            if (sqlTrace1Frequency < sqlTrace2Frequency) {
                compare = 1;
            } else if (sqlTrace1Frequency > sqlTrace2Frequency) {
                compare = -1;
            }
            
            // If the number of executions are the same, compare the last usage time
            if (compare == 0) {
                final long sqlTrace1LastUsageTime = sqlTrace1.getLastUsageTime();
                final long sqlTrace2LastUsageTime = sqlTrace2.getLastUsageTime();
                
                if (sqlTrace1LastUsageTime < sqlTrace2LastUsageTime) {
                    compare = 1;
                } else if (sqlTrace1LastUsageTime > sqlTrace2LastUsageTime) {
                    compare = -1;
                }
            }
            
            return compare;
        }
    };
}