namespace GMap.NET.CacheProviders{
#if MySQL
using System;
using System.Data;
using System.Diagnostics;
using System.IO;
using GMap.NET;
using MySql.Data.MySqlClient;
/// <summary>
/// image cache for mysql server
/// </summary>
public class MySQLPureImageCache : PureImageCache, IDisposable
{
string connectionString = string.Empty;
public string ConnectionString
{
get
{
return connectionString;
}
set
{
if(connectionString != value)
{
connectionString = value;
if(Initialized)
{
Dispose();
Initialize();
}
}
}
}
MySqlCommand cmdInsert;
MySqlCommand cmdFetch;
MySqlConnection cnGet;
MySqlConnection cnSet;
bool initialized = false;
/// <summary>
/// is cache initialized
/// </summary>
public bool Initialized
{
get
{
lock(this)
{
return initialized;
}
}
private set
{
lock(this)
{
initialized = value;
}
}
}
/// <summary>
/// inits connection to server
/// </summary>
/// <returns></returns>
public bool Initialize()
{
lock(this)
{
if(!initialized)
{
#region prepare mssql & cache table
try
{
// different connections so the multi-thread inserts and selects don't collide on open readers.
this.cnGet = new MySqlConnection(connectionString);
this.cnGet.Open();
this.cnSet = new MySqlConnection(connectionString);
this.cnSet.Open();
{
using(MySqlCommand cmd = new MySqlCommand(
@" CREATE TABLE IF NOT EXISTS `gmapnetcache` (
`Type` int(10) NOT NULL,
`Zoom` int(10) NOT NULL,
`X` int(10) NOT NULL,
`Y` int(10) NOT NULL,
`Tile` longblob NOT NULL,
PRIMARY KEY (`Type`,`Zoom`,`X`,`Y`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;", cnGet))
{
cmd.ExecuteNonQuery();
}
}
this.cmdFetch = new MySqlCommand("SELECT Tile FROM `gmapnetcache` WHERE Type=@type AND Zoom=@zoom AND X=@x AND Y=@y", cnGet);
this.cmdFetch.Parameters.Add("@type", MySqlDbType.Int32);
this.cmdFetch.Parameters.Add("@zoom", MySqlDbType.Int32);
this.cmdFetch.Parameters.Add("@x", MySqlDbType.Int32);
this.cmdFetch.Parameters.Add("@y", MySqlDbType.Int32);
this.cmdFetch.Prepare();
this.cmdInsert = new MySqlCommand("INSERT INTO `gmapnetcache` ( Type, Zoom, X, Y, Tile ) VALUES ( @type, @zoom, @x, @y, @tile )", cnSet);
this.cmdInsert.Parameters.Add("@type", MySqlDbType.Int32);
this.cmdInsert.Parameters.Add("@zoom", MySqlDbType.Int32);
this.cmdInsert.Parameters.Add("@x", MySqlDbType.Int32);
this.cmdInsert.Parameters.Add("@y", MySqlDbType.Int32);
this.cmdInsert.Parameters.Add("@tile", MySqlDbType.Blob); //, calcmaximgsize);
//can't prepare insert because of the IMAGE field having a variable size. Could set it to some 'maximum' size?
Initialized = true;
}
catch(Exception ex)
{
this.initialized = false;
Debug.WriteLine(ex.Message);
}
#endregion
}
return initialized;
}
}
#region IDisposable Members
public void Dispose()
{
lock(cmdInsert)
{
if(cmdInsert != null)
{
cmdInsert.Dispose();
cmdInsert = null;
}
if(cnSet != null)
{
cnSet.Dispose();
cnSet = null;
}
}
lock(cmdFetch)
{
if(cmdFetch != null)
{
cmdFetch.Dispose();
cmdFetch = null;
}
if(cnGet != null)
{
cnGet.Dispose();
cnGet = null;
}
}
Initialized = false;
}
#endregion
#region PureImageCache Members
public bool PutImageToCache(MemoryStream tile, MapType type, Point pos, int zoom)
{
bool ret = true;
{
if(Initialize())
{
try
{
lock(cmdInsert)
{
cnSet.Ping();
if(cnSet.State != ConnectionState.Open)
{
cnSet.Open();
}
cmdInsert.Parameters["@type"].Value = (int) type;
cmdInsert.Parameters["@zoom"].Value = zoom;
cmdInsert.Parameters["@x"].Value = pos.X;
cmdInsert.Parameters["@y"].Value = pos.Y;
cmdInsert.Parameters["@tile"].Value = tile.GetBuffer();
cmdInsert.ExecuteNonQuery();
}
}
catch(Exception ex)
{
Debug.WriteLine(ex.ToString());
ret = false;
Dispose();
}
}
}
return ret;
}
public PureImage GetImageFromCache(MapType type, Point pos, int zoom)
{
PureImage ret = null;
{
if(Initialize())
{
try
{
object odata = null;
lock(cmdFetch)
{
cnGet.Ping();
if(cnGet.State != ConnectionState.Open)
{
cnGet.Open();
}
cmdFetch.Parameters["@type"].Value = (int) type;
cmdFetch.Parameters["@zoom"].Value = zoom;
cmdFetch.Parameters["@x"].Value = pos.X;
cmdFetch.Parameters["@y"].Value = pos.Y;
odata = cmdFetch.ExecuteScalar();
}
if(odata != null && odata != DBNull.Value)
{
byte[] tile = (byte[]) odata;
if(tile != null && tile.Length > 0)
{
if(GMaps.Instance.ImageProxy != null)
{
MemoryStream stm = new MemoryStream(tile, 0, tile.Length, false, true);
ret = GMaps.Instance.ImageProxy.FromStream(stm);
if(ret!= null)
{
ret.Data = stm;
}
}
}
tile = null;
}
}
catch(Exception ex)
{
Debug.WriteLine(ex.ToString());
ret = null;
Dispose();
}
}
}
return ret;
}
#endregion
}
#endif
}
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