/// <summary>
/// Shallow copies the base fields from the source message to this instance.
/// </summary>
/// <param name="source">The source message.</param>
/// <param name="regenMsgID">
/// Pass as <c>true</c> to renegerate the <see cref="_MsgID" /> property if the
/// source message ID property is not empty.
/// </param>
/// <remarks>
/// Use this in overriden <see cref="Clone" /> method implementations
/// to ensure that the base message fields are copied properly.
/// </remarks>
protected virtual void CopyBaseFields(Msg source, bool regenMsgID)
{
this.version = source.version;
this.flags = source.flags;
this.ttl = source.ttl;
this.toEP = source.toEP;
this.fromEP = source.fromEP;
this.receiptEP = source.receiptEP;
this.sessionID = source.sessionID;
this.token = source.token;
if (source.msgID == Guid.Empty)
{
this.msgID = Guid.Empty;
}
else if (regenMsgID)
{
this.msgID = Helper.NewGuid();
}
else
{
this.msgID = source.msgID;
}
if (source.extHeaders != null)
{
this.extHeaders = source.extHeaders.Clone();
}
}
private bool inUse; // True if the message is considered to be
// owned by the messaging library.
#endif
/// <summary>
/// Constructor.
/// </summary>
public Msg()
{
this.version = 0;
this.flags = 0;
this.ttl = 0;
this.toEP = null;
this.fromEP = null;
this.receiptEP = null;
this.msgID = Guid.Empty;
this.sessionID = Guid.Empty;
#if WINFULL
this.session = null;
#endif
this.token = null;
this.extHeaders = null;
#if WINFULL
this.recvChannel = null;
#endif
this.msgFrame = null;
#if DEBUG
this.inUse = false;
#endif
}
/// <summary>
/// Loads the message payload of the base classes from the memory
/// stream passed.
/// </summary>
/// <param name="es">The enhanced stream holding the payload data.</param>
/// <remarks>
/// Classes that are designed to be derived from should implement
/// this method to serialize their content. Note that the base.ReadFrom()
/// method should be called before doing this to ensure that any
/// ancestor classes will be unserialized properly.
/// </remarks>
protected virtual void ReadFrom(EnhancedStream es)
{
#if DEBUG
this.readBase = true;
#endif
this.version = es.ReadByte();
this.ttl = es.ReadByte();
this.flags = (MsgFlag)es.ReadInt32();
this.toEP = MsgEP.Parse(es.ReadString16());
this.fromEP = MsgEP.Parse(es.ReadString16());
this.receiptEP = MsgEP.Parse(es.ReadString16());
if ((flags & MsgFlag.MsgID) != 0)
{
msgID = new Guid(es.ReadBytes(16));
}
else
{
msgID = Guid.Empty;
}
if ((flags & MsgFlag.SessionID) != 0)
{
sessionID = new Guid(es.ReadBytes(16));
}
else
{
sessionID = Guid.Empty;
}
if ((flags & MsgFlag.SecurityToken) != 0)
{
token = es.ReadBytes16();
}
else
{
token = null;
}
// Read the extended headers
if ((flags & MsgFlag.ExtensionHeaders) != 0)
{
int cHeaders;
MsgHeaderID headerID;
byte[] contents;
cHeaders = es.ReadByte();
if (cHeaders > 0)
{
extHeaders = new MsgHeaderCollection(cHeaders);
for (int i = 0; i < cHeaders; i++)
{
headerID = (MsgHeaderID)es.ReadByte();
contents = es.ReadBytes16();
extHeaders.Set(new MsgHeader(headerID, contents));
}
}
}
}
/// <summary>
/// Serializes the payload of the base classes into the memory
/// stream.
/// </summary>
/// <param name="es">The stream where the output is to be written.</param>
/// <remarks>
/// Classes that are designed to be derived from should implement
/// this method to serialize their content. Note that the base.WriteBase()
/// method should be called before doing this to ensure that any
/// ancestor classes will be serialized properly.
/// </remarks>
protected virtual void WriteBase(EnhancedStream es)
{
#if DEBUG
this.writeBase = true;
#endif
if (extHeaders != null && extHeaders.Count > 0)
{
flags |= MsgFlag.ExtensionHeaders;
}
#if DEBUG
// Verify the consistency of the MsgID and SessionID flags and fields.
if (msgID == Guid.Empty)
{
if ((flags & MsgFlag.MsgID) != 0)
{
SysLog.LogWarning("Message [{0}] has [MsgFlag.MsgID] set but has no [MsgID]. [MsgFlag.MsgID] flag will be cleared.");
flags &= ~MsgFlag.MsgID;
}
}
else
{
if ((flags & MsgFlag.MsgID) == 0)
{
SysLog.LogWarning("Message [{0}] has [MsgFlag.MsgID] cleared but has a [MsgID]. [MsgFlag.MsgID] will be set.");
flags |= MsgFlag.MsgID;
}
}
if (sessionID == Guid.Empty)
{
if ((flags & MsgFlag.SessionID) != 0)
{
SysLog.LogWarning("Message [{0}] has [MsgFlag.SessionID] set but has no [SessionID]. [MsgFlag.SessionID] flag will be cleared.");
flags &= ~MsgFlag.SessionID;
}
}
else
{
if ((flags & MsgFlag.SessionID) == 0)
{
SysLog.LogWarning("Message [{0}] has [MsgFlag.SessionID] cleared but has a [SessionID]. [MsgFlag.SessionID] will be set.");
flags |= MsgFlag.SessionID;
}
}
if (token == null)
{
if ((flags & MsgFlag.SecurityToken) != 0)
{
SysLog.LogWarning("Message [{0}] has [MsgFlag.SecurityToken] set but has no [SecurityToken]. [MsgFlag.SecurityToken] flag will be cleared.");
flags &= ~MsgFlag.SessionID;
}
}
else
{
if ((flags & MsgFlag.SecurityToken) == 0)
{
SysLog.LogWarning("Message [{0}] has [MsgFlag.SecurityToken] cleared but has a [SecurityToken]. [MsgFlag.SecurityToken] will be set.");
flags |= MsgFlag.SecurityToken;
}
}
#endif
es.WriteByte((byte)version);
es.WriteByte((byte)ttl);
es.WriteInt32((int)flags);
es.WriteString16(toEP != null ? toEP.ToString() : null);
es.WriteString16(fromEP != null ? fromEP.ToString() : null);
es.WriteString16(receiptEP != null ? receiptEP.ToString() : null);
if ((flags & MsgFlag.MsgID) != 0)
{
es.WriteBytesNoLen(msgID.ToByteArray());
}
if ((flags & MsgFlag.SessionID) != 0)
{
es.WriteBytesNoLen(sessionID.ToByteArray());
}
if ((flags & MsgFlag.SecurityToken) != 0)
{
es.WriteBytes16(token);
}
// Write the extended headers
if ((flags & MsgFlag.ExtensionHeaders) != 0)
{
es.WriteByte((byte)extHeaders.Count);
for (int i = 0; i < extHeaders.Count; i++)
{
var header = extHeaders[i];
es.WriteByte((byte)header.HeaderID);
es.WriteBytes16(header.Contents);
}
}
}
