public SetCommand(string command, SetCommandType type, string value) => (Command, this.type, this.value) = (command, type, value);
/// <summary>
/// Stores data to cache.
///
/// If data does not already exist for this key on the server, or if the key is being<br/>
/// deleted, the specified value will not be stored.<br/>
/// The server will automatically delete the value when the expiration time has been reached.<br/>
/// <br/>
/// If compression is enabled, and the data is longer than the compression threshold<br/>
/// the data will be stored in compressed form.<br/>
/// <br/>
/// As of the current release, all objects stored will use serialization.
/// </summary>
///
/// <param name="cmdType">action to take (set, add, replace)</param>
/// <param name="key">key to store cache under</param>
/// <param name="value">object to cache</param>
/// <param name="expiry">expiration, if any</param>
/// <param name="sock">SockIO to use</param>
///
/// <returns><code>true</code> if successful, <code>fale</code> or exception otherwise</returns>
private bool SetItem(SetCommandType cmdType, string key, object value, DateTime expiry, SockIOPool.SockIO sock)
{
// store flags
int flags = 0;
// byte array to hold data
byte[] val;
if(expiry.Equals(DateTime.MinValue))
expiry = new DateTime(0);
// serialize the object
// unless client request data to be not serialized
// in which case, we will go with string representation
// but only for a select few classes
if (!(value is string || value is Int32 || value is Double || value is Single || value is Int64 || value is SByte || value is Int16 || value is Char || value is StringBuilder))
{
// we can ONLY not serialize the above classes
// this is generally a bad idea as we should always
// just use serialization.
// but, it is useful for sharing data between non-.NET
// and also for storing ints for the increment method
if(log.IsInfoEnabled) log.Info("storing data as a string for key: " + key + " for class: " + value.GetType().FullName);
val = UTF8Encoding.UTF8.GetBytes(value.ToString());
}
else
{
if(log.IsInfoEnabled) log.Info("serializing for key: " + key + " for class: " + value.GetType().FullName);
try
{
MemoryStream bos = new MemoryStream();
new BinaryFormatter().Serialize((new BinaryWriter(bos)).BaseStream, value);
val = bos.ToArray();
flags |= F_SERIALIZED;
}
catch(SerializationException se)
{
if(log.IsErrorEnabled) log.Error("failed to serialize obj: " + value.ToString(), se);
// return socket to pool and bail
sock.Close();
#if EXCEPTIONS
throw new MemcachedException(se);
#else
return false;
#endif
}
}
// now try to compress if we want to
// and if the length is over the threshold
if (compressEnable && val.Length > compressThreshold)
{
if(log.IsInfoEnabled) log.Info("trying to compress data, size prior to compression: " + val.Length);
try
{
MemoryStream bos = new MemoryStream(val.Length);
GZipOutputStream gos = new GZipOutputStream(bos);
gos.Write(val, 0, val.Length);
gos.Close();
// store it and set compression flag
val = bos.ToArray();
flags |= F_COMPRESSED;
if(log.IsInfoEnabled) log.Info("compression succeeded, size after: " + val.Length);
}
// TODO Not sure which specific exception(s) is/are thrown
catch(Exception e)
{
if(log.IsErrorEnabled) log.Error("Exception while compressing stream", e);
}
}
// now write the data to the cache server
StringBuilder cmd = new StringBuilder();
switch(cmdType)
{
case SetCommandType.Add:
cmd.Append("add");
break;
case SetCommandType.Replace:
cmd.Append("replace");
break;
case SetCommandType.Set:
cmd.Append("set");
break;
default:
// As if this can actually happen
throw new ArgumentException("cmdType");
}
cmd.Append(" ");
cmd.Append(key);
cmd.Append(" ");
cmd.Append(flags.ToString());
cmd.Append(" ");
cmd.Append(expiry.Ticks / 1000);
cmd.Append(" ");
cmd.Append(val.Length.ToString());
cmd.Append("\n");
try
{
sock.Write(UTF8Encoding.UTF8.GetBytes(cmd.ToString()));
sock.Write(val);
sock.Write(UTF8Encoding.UTF8.GetBytes("\n"));
sock.Flush();
// get result code
string line = sock.ReadLine();
if(log.IsInfoEnabled) log.Info("memcache cmd (result code): " + cmd + " (" + line + ")");
switch(line)
{
case STORED:
if(log.IsInfoEnabled) log.Info("data successfully stored for key: " + key);
return true;
case NOTSTORED:
if(log.IsInfoEnabled) log.Info("data not stored in cache for key: " + key);
#if EXCEPTIONS
throw new NotStoredException(key);
#else
return false;
#endif
default:
if(log.IsErrorEnabled) log.Error("error storing data in cache for key: " + key + " -- length: " + val.Length);
#if EXCEPTIONS
throw new MemcachedException(line);
#else
return false;
#endif
}
}
catch(IOException ioe)
{
if(log.IsErrorEnabled) log.Error("exception thrown while writing bytes to server on set", ioe);
try
{
sock.TrueClose();
}
catch(IOException ioee)
{
if(log.IsErrorEnabled) log.Error("failed to close socket : " + sock.ToString(), ioee);
}
sock = null;
#if EXCEPTIONS
throw new SocketException(e);
#else
return false;
#endif
}
finally
{
if(sock != null)
sock.Close();
}
}
