public void VerifyIsWrappingReturnsFalseForNoMatch()
{
JET_CALLBACK callback = CreateCallback();
var wrapper = new JetCallbackWrapper(callback);
Assert.IsFalse(wrapper.IsWrapping(CreateCallback()));
GC.KeepAlive(callback);
}
public void VerifyWrapperCallsCallback()
{
bool callbackWasCalled = false;
var wrapper = new JetCallbackWrapper(
(sesid, dbid, tableid, cbtyp, arg1, arg2, context, unused) =>
{
callbackWasCalled = true;
return JET_err.Success;
});
wrapper.NativeCallback(IntPtr.Zero, 0, IntPtr.Zero, 0, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
Assert.IsTrue(callbackWasCalled);
}
/// <summary>
/// Wrap a callback and returns its wrapper. If the callback is
/// already wrapped then the existing wrapper is returned.
/// </summary>
/// <param name="callback">The callback to add.</param>
/// <returns>The callback wrapper for the callback.</returns>
public JetCallbackWrapper Add(JET_CALLBACK callback)
{
lock (this.lockObject)
{
JetCallbackWrapper wrapper;
if (!this.TryFindWrapperFor(callback, out wrapper))
{
wrapper = new JetCallbackWrapper(callback);
this.callbackWrappers.Add(wrapper);
}
return wrapper;
}
}
/// <summary>
/// Look in the list of callback wrappers to see if there is already an entry for
/// this callback.
/// </summary>
/// <param name="callback">The callback to look for.</param>
/// <param name="wrapper">Returns the wrapper, if found.</param>
/// <returns>True if a wrapper was found, false otherwise.</returns>
private bool TryFindWrapperFor(JET_CALLBACK callback, out JetCallbackWrapper wrapper)
{
foreach (JetCallbackWrapper w in this.callbackWrappers)
{
if (w.IsWrapping(callback))
{
wrapper = w;
return(true);
}
}
wrapper = null;
return(false);
}
/// <summary>
/// Wrap a callback and returns its wrapper. If the callback is
/// already wrapped then the existing wrapper is returned.
/// </summary>
/// <param name="callback">The callback to add.</param>
/// <returns>The callback wrapper for the callback.</returns>
public JetCallbackWrapper Add(JET_CALLBACK callback)
{
lock (this.lockObject)
{
JetCallbackWrapper wrapper;
if (!this.TryFindWrapperFor(callback, out wrapper))
{
wrapper = new JetCallbackWrapper(callback);
this.callbackWrappers.Add(wrapper);
}
return(wrapper);
}
}
/// <summary>
/// Look in the list of callback wrappers to see if there is already an entry for
/// this callback.
/// </summary>
/// <param name="callback">The callback to look for.</param>
/// <param name="wrapper">Returns the wrapper, if found.</param>
/// <returns>True if a wrapper was found, false otherwise.</returns>
private bool TryFindWrapperFor(JET_CALLBACK callback, out JetCallbackWrapper wrapper)
{
foreach (JetCallbackWrapper w in this.callbackWrappers)
{
if (w.IsWrapping(callback))
{
wrapper = w;
return true;
}
}
wrapper = null;
return false;
}
public void VerifyWrapperReturnsReturnCode()
{
var wrapper = new JetCallbackWrapper(
(sesid, dbid, tableid, cbtyp, arg1, arg2, context, unused) => JET_err.WriteConflict);
Assert.AreEqual(
JET_err.WriteConflict,
wrapper.Callback(IntPtr.Zero, 0, IntPtr.Zero, 0, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero));
}
public void VerifyWrapperPassesArguments()
{
JET_SESID expectedSesid = new JET_SESID { Value = (IntPtr)1 };
JET_DBID expectedDbid = new JET_DBID { Value = 2 };
JET_TABLEID expectedTableid = new JET_TABLEID { Value = (IntPtr)3 };
JET_cbtyp expectedCbtyp = JET_cbtyp.AfterReplace;
object expectedArg1 = null;
object expectedArg2 = null;
IntPtr expectedContext = (IntPtr)4;
JET_SESID actualSesid = new JET_SESID();
JET_DBID actualDbid = new JET_DBID();
JET_TABLEID actualTableid = new JET_TABLEID();
JET_cbtyp actualCbtyp = JET_cbtyp.Null;
object actualArg1 = null;
object actualArg2 = null;
IntPtr actualContext = new IntPtr();
var wrapper = new JetCallbackWrapper(
(sesid, dbid, tableid, cbtyp, arg1, arg2, context, unused) =>
{
actualSesid = sesid;
actualDbid = dbid;
actualTableid = tableid;
actualCbtyp = cbtyp;
actualArg1 = arg1;
actualArg2 = arg2;
actualContext = context;
return JET_err.Success;
});
wrapper.Callback(
expectedSesid.Value,
expectedDbid.Value,
expectedTableid.Value,
(uint)expectedCbtyp,
IntPtr.Zero,
IntPtr.Zero,
expectedContext,
IntPtr.Zero);
Assert.AreEqual(expectedSesid, actualSesid);
Assert.AreEqual(expectedDbid, actualDbid);
Assert.AreEqual(expectedTableid, actualTableid);
Assert.AreEqual(expectedCbtyp, actualCbtyp);
Assert.AreEqual(expectedArg1, actualArg1);
Assert.AreEqual(expectedArg2, actualArg2);
Assert.AreEqual(expectedContext, actualContext);
}
public void VerifyExceptionInCallbackIsCaught()
{
var wrapper = new JetCallbackWrapper(
(sesid, dbid, tableid, cbtyp, arg1, arg2, context, unused) =>
{
throw new ArgumentNullException();
});
Assert.AreEqual(
JET_err.CallbackFailed,
wrapper.Callback(IntPtr.Zero, 0, IntPtr.Zero, 0, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero));
}