log4net.Util.CyclicBuffer.Append C# (CSharp) Méthode

		public LoggingEvent Append(LoggingEvent loggingEvent)
		{	
			if (loggingEvent == null)
			{
				throw new ArgumentNullException("loggingEvent");
			}

			lock(this)
			{
				// save the discarded event
				LoggingEvent discardedLoggingEvent = m_events[m_last];

				// overwrite the last event position
				m_events[m_last] = loggingEvent;	
				if (++m_last == m_maxSize)
				{
					m_last = 0;
				}

				if (m_numElems < m_maxSize)
				{
					m_numElems++;
				}
				else if (++m_first == m_maxSize)
				{
					m_first = 0;
				}

				if (m_numElems < m_maxSize)
				{
					// Space remaining
					return null;
				}
				else
				{
					// Buffer is full and discarding an event
					return discardedLoggingEvent;
				}
			}
		}

		[Test] public void TestSize1()
		{
			CyclicBuffer cb = new CyclicBuffer(1);

			Assert.AreEqual(0, cb.Length, "Empty Buffer should have length 0");
			Assert.AreEqual(1, cb.MaxSize, "Buffer should have max size 1");

			LoggingEvent event1 = new LoggingEvent(null, null, null, null, null, null);
			LoggingEvent event2 = new LoggingEvent(null, null, null, null, null, null);

			LoggingEvent discardedEvent = cb.Append(event1);

			Assert.IsNull(discardedEvent, "No event should be discarded untill the buffer is full");
			Assert.AreEqual(1, cb.Length, "Buffer should have length 1");
			Assert.AreEqual(1, cb.MaxSize, "Buffer should still have max size 1");


			discardedEvent = cb.Append(event2);

			Assert.AreSame(event1, discardedEvent, "Expect event1 to now be discarded");
			Assert.AreEqual(1, cb.Length, "Buffer should still have length 1");
			Assert.AreEqual(1, cb.MaxSize, "Buffer should really still have max size 1");

			LoggingEvent[] discardedEvents = cb.PopAll();

			Assert.AreEqual(1, discardedEvents.Length, "Poped events length should be 1");
			Assert.AreSame(event2, discardedEvents[0], "Expect event2 to now be popped");
			Assert.AreEqual(0, cb.Length, "Buffer should be back to length 0");
			Assert.AreEqual(1, cb.MaxSize, "Buffer should really really still have max size 1");
		}