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namespace GMap
.NET.CacheProviders
{
#if MySQL
using System;
using System.Data;
using System.Diagnostics;
using System.IO;
using GMap.NET;
using MySql.Data.MySqlClient;
using GMap.NET.MapProviders;
/// <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
(byte[] tile,
int type, GPoint pos,
int zoom
)
{
bool ret
= true;
{
if(Initialize
())
{
try
{
lock(cmdInsert
)
{
cnSet
.Ping();
if(cnSet
.State != ConnectionState
.Open)
{
cnSet
.Open();
}
cmdInsert
.Parameters["@type"].Value = type
;
cmdInsert
.Parameters["@zoom"].Value = zoom
;
cmdInsert
.Parameters["@x"].Value = pos
.X;
cmdInsert
.Parameters["@y"].Value = pos
.Y;
cmdInsert
.Parameters["@tile"].Value = tile
;
cmdInsert
.ExecuteNonQuery();
}
}
catch(Exception ex
)
{
Debug
.WriteLine(ex
.ToString());
ret
= false;
Dispose
();
}
}
}
return ret
;
}
public PureImage GetImageFromCache
(int type, GPoint 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 = 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(GMapProvider
.TileImageProxy != null)
{
ret
= GMapProvider
.TileImageProxy.FromArray(tile
);
}
}
tile
= null;
}
}
catch(Exception ex
)
{
Debug
.WriteLine(ex
.ToString());
ret
= null;
Dispose
();
}
}
}
return ret
;
}
int PureImageCache
.DeleteOlderThan(DateTime date,
int ? type
)
{
throw new NotImplementedException
();
}
#endregion
}
#endif
}