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279 lines (248 loc) · 8.73 KB
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/*
* Copyright 2010 ALM Works Ltd
*
* 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.almworks.sqlite4java;
import java.io.*;
import java.util.*;
import static com.almworks.sqlite4java.SQLiteConstants.SQLITE_DONE;
import static com.almworks.sqlite4java.SQLiteConstants.SQLITE_ROW;
/**
* SQLiteProfiler measures and accumulates statistics for various SQLite methods. The statistics is then available
* in a report form.
* <p>
* To start profiling, call {@link SQLiteConnection#profile} and get the profiler. After profiling is done, call
* {@link SQLiteConnection#stopProfiling} and inspect the profiler's results.
* <p>
* This is pure Java-based profiling, not related to <code>sqlite3_profile</code> method.
*
* @author Igor Sereda
* @see SQLiteConnection#profile
* @see SQLiteConnection#stopProfiling
*/
public class SQLiteProfiler {
private static final String HEADER = "-----------------------------------------------------------------------------";
private final Map<String, SQLStat> myStats = new HashMap<String, SQLStat>();
/**
* Outputs current report into PrintWriter.
*
* @param out report writer
*/
public void printReport(PrintWriter out) {
ArrayList<SQLStat> stats = new ArrayList<SQLStat>(myStats.values());
Collections.sort(stats, new Comparator<SQLStat>() {
public int compare(SQLStat o1, SQLStat o2) {
return o1.getTotalTime() < o2.getTotalTime() ? 1 : -1;
}
});
for (SQLStat stat : stats) {
stat.printReport(out);
}
}
/**
* Returns current report as a String.
*
* @return current report
*/
public String printReport() {
StringWriter sw = new StringWriter();
printReport(new PrintWriter(sw));
return sw.toString();
}
/**
* Prints report to a file. If IOException occurs, write warning log message, but does not throw it on the caller.
*
* @param file target file
*/
public void printReport(String file) {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
PrintWriter writer = new PrintWriter(new OutputStreamWriter(fos));
printReport(writer);
writer.close();
} catch (IOException e) {
Internal.logWarn(this, e);
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
// ignore
}
}
}
}
void reportExec(String sql, long nfrom, long nto, int rc) {
getStat(sql).report(rc == 0 ? "exec" : "exec:error(" + rc + ")", nfrom, nto);
}
void reportPrepare(String sql, long nfrom, long nto, int rc) {
getStat(sql).report(rc == 0 ? "prepare" : "prepare:error(" + rc + ")", nfrom, nto);
}
void reportStep(boolean alreadyStepped, String sql, long nfrom, long nto, int rc) {
SQLStat stat = getStat(sql);
if (rc != SQLITE_ROW && rc != SQLITE_DONE) {
stat.report("step:error(" + rc + ")", nfrom, nto);
return;
}
stat.report("step", nfrom, nto);
if (alreadyStepped || rc == SQLITE_ROW) {
stat.report(alreadyStepped ? "step:next" : "step:first", nfrom, nto);
}
}
void reportLoadInts(boolean alreadyStepped, String sql, long nfrom, long nto, int rc, int count) {
SQLStat stat = getStat(sql);
if (rc != SQLITE_ROW && rc != SQLITE_DONE) {
stat.report("loadInts:error(" + rc + ")", nfrom, nto);
return;
}
stat.report("loadInts", nfrom, nto);
if (alreadyStepped || rc == SQLITE_ROW) {
stat.report(alreadyStepped ? "loadInts:next" : "loadInts:first", nfrom, nto);
}
// todo count
}
void reportLoadLongs(boolean alreadyStepped, String sql, long nfrom, long nto, int rc, int count) {
SQLStat stat = getStat(sql);
if (rc != SQLITE_ROW && rc != SQLITE_DONE) {
stat.report("loadLongs:error(" + rc + ")", nfrom, nto);
return;
}
stat.report("loadLongs", nfrom, nto);
if (alreadyStepped || rc == SQLITE_ROW) {
stat.report(alreadyStepped ? "loadLongs:next" : "loadLongs:first", nfrom, nto);
}
// todo count
}
private SQLStat getStat(String sql) {
SQLStat stat = myStats.get(sql);
if (stat == null) {
stat = new SQLStat(sql);
myStats.put(sql, stat);
}
return stat;
}
private static String formatDuration(long nanos) {
if (nanos > 1000000000L) {
return String.format(Locale.US, "%.1fs", ((double) nanos) / 1000000000.0);
} else if (nanos > 100000000L) {
return String.format(Locale.US, "%dms", nanos / 1000000L);
} else if (nanos > 10000000L) {
return String.format(Locale.US, "%.1fms", ((double) nanos) / 1000000.0);
} else if (nanos > 100000L) {
return String.format(Locale.US, "%.2fms", ((double) nanos) / 1000000.0);
} else {
return String.format(Locale.US, "%.2fmks", ((double) nanos) / 1000.0);
}
}
private static class SQLStat {
private final String mySQL;
private final Map<String, Stat> myStats = new TreeMap<String, Stat>();
public SQLStat(String sql) {
mySQL = sql;
}
public String getSQL() {
return mySQL;
}
public void report(String name, long nfrom, long nto) {
Stat stat = myStats.get(name);
if (stat == null) {
stat = new Stat();
myStats.put(name, stat);
}
stat.report(nfrom, nto);
}
public long getTotalTime() {
long total = 0;
for (Stat stat : myStats.values()) {
total += stat.myTotalNanos;
}
return total;
}
public void printReport(PrintWriter out) {
out.println(HEADER);
out.println(mySQL);
out.println(HEADER);
String totalPrefix = "total time";
int maxPrefix = totalPrefix.length();
for (String s : myStats.keySet()) {
maxPrefix = Math.max(maxPrefix, s.length());
}
StringBuilder b = new StringBuilder();
addLeftColumn(b, totalPrefix, maxPrefix);
b.append(formatDuration(getTotalTime()));
out.println(b.toString());
for (Map.Entry<String, Stat> e : myStats.entrySet()) {
b.setLength(0);
addLeftColumn(b, e.getKey(), maxPrefix);
Stat stat = e.getValue();
b.append("total:").append(formatDuration(stat.getTotalNanos())).append(' ');
b.append("count:").append(stat.getTotalCount()).append(' ');
b.append("min|avg|max:").append(formatDuration(stat.getMinNanos())).append('|').append(formatDuration(stat.getAvgNanos())).append('|').append(formatDuration(stat.getMaxNanos())).append(' ');
b.append("freq:").append(stat.getFrequency());
out.println(b.toString());
}
out.println();
}
private void addLeftColumn(StringBuilder b, String name, int maxPrefix) {
b.append(" ");
b.append(name);
for (int add = maxPrefix + 4 - b.length(); add > 0; add--) b.append(' ');
b.append(" ");
}
}
private static class Stat {
private int myTotalCount;
private long myTotalNanos;
private long myMinNanos = -1;
private long myMaxNanos = -1;
private long myFirstTime;
private long myLastTime;
public void report(long nfrom, long nto) {
long duration = nto - nfrom;
if (duration < 0) return;
myTotalCount++;
myTotalNanos += duration;
if (myMinNanos < 0 || duration < myMinNanos)
myMinNanos = duration;
if (myMaxNanos < 0 || duration > myMaxNanos)
myMaxNanos = duration;
myLastTime = System.currentTimeMillis();
if (myFirstTime == 0)
myFirstTime = myLastTime;
}
public long getTotalNanos() {
return myTotalNanos;
}
public int getTotalCount() {
return myTotalCount;
}
public long getMinNanos() {
return myMinNanos;
}
public long getAvgNanos() {
return myTotalCount > 0 ? myTotalNanos / myTotalCount : 0;
}
public long getMaxNanos() {
return myMaxNanos;
}
public String getFrequency() {
if (myTotalCount < 10) return "-";
long millis = myLastTime - myFirstTime;
long t = millis / myTotalCount;
if (t == 0) return "-";
return "1/" + formatDuration(t * 1000000L);
}
}
}