twitter / netty-http2Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 280 units with 2,761 lines of code in units (76.4% of code).

1 very complex units (265 lines of code)
1 complex units (163 lines of code)
8 medium complex units (379 lines of code)
12 simple units (342 lines of code)
258 very simple units (1,612 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
public void decode() in src/main/java/com/twitter/http2/HttpFrameDecoder.java	265	60	1
public void write() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	163	27	3
private static boolean isValidFrameHeader() in src/main/java/com/twitter/http2/HttpFrameDecoder.java	49	25	4
protected void decode() in src/main/java/com/twitter/http2/HttpStreamDecoder.java	102	21	3
public static HttpErrorCode valueOf() in src/main/java/com/twitter/http2/HttpErrorCode.java	34	15	1
public ByteBuf encodeHeadersFrame() in src/main/java/com/twitter/http2/HttpFrameEncoder.java	54	14	6
public void readDataFrame() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	48	13	4
public void readSetting() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	41	13	2
private static State getNextState() in src/main/java/com/twitter/http2/HttpFrameDecoder.java	30	12	2
private static void validateChar() in src/main/java/com/twitter/http2/DefaultHttp2Headers.java	21	11	1
public void readDataFramePadding() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	35	10	3
public ByteBuf encode() in src/main/java/com/twitter/http2/HttpHeaderBlockEncoder.java	34	9	2
protected void writeChunk() in src/main/java/com/twitter/http2/HttpStreamEncoder.java	38	7	4
public void readHeadersFrame() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	36	7	6
public void write() in src/main/java/com/twitter/http2/HttpStreamEncoder.java	31	6	3
public void operationComplete() in src/main/java/com/twitter/http2/HttpStreamEncoder.java	40	6	1
PendingWrite getPendingWrite() in src/main/java/com/twitter/http2/HttpConnection.java	15	6	1
private synchronized boolean acceptStream() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	18	6	4
private void updateSendWindowSize() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	42	6	3
public void endHeaderBlock() in src/main/java/com/twitter/http2/HttpHeaderBlockDecoder.java	13	6	1
public void addHeader() in src/main/java/com/twitter/http2/HttpHeaderBlockDecoder.java	22	6	3
private void addHeader() in src/main/java/com/twitter/http2/HttpHeaderBlockDecoder.java	18	6	2
private static boolean isValidPaddingLength() in src/main/java/com/twitter/http2/HttpFrameDecoder.java	17	5	4
private ChannelPromise getMessageFuture() in src/main/java/com/twitter/http2/HttpStreamEncoder.java	30	5	4
void acceptStream() in src/main/java/com/twitter/http2/HttpConnection.java	19	5	6
int updateReceiveWindowSize() in src/main/java/com/twitter/http2/HttpConnection.java	14	5	2
boolean setPriority() in src/main/java/com/twitter/http2/HttpConnection.java	24	5	4
public void readWindowUpdateFrame() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	14	5	2
public void decode() in src/main/java/com/twitter/http2/HttpHeaderBlockDecoder.java	22	5	2
public ByteBuf encodePushPromiseFrame() in src/main/java/com/twitter/http2/HttpFrameEncoder.java	26	5	3
public HttpFrameDecoder() in src/main/java/com/twitter/http2/HttpFrameDecoder.java	16	4	3
private static boolean frameHasPadding() in src/main/java/com/twitter/http2/HttpFrameDecoder.java	10	4	2
private StreamState removeActiveStream() in src/main/java/com/twitter/http2/HttpConnection.java	14	4	2
void closeRemoteSide() in src/main/java/com/twitter/http2/HttpConnection.java	10	4	2
void closeLocalSide() in src/main/java/com/twitter/http2/HttpConnection.java	10	4	2
int getSendWindowSize() in src/main/java/com/twitter/http2/HttpConnection.java	8	4	1
int updateSendWindowSize() in src/main/java/com/twitter/http2/HttpConnection.java	8	4	2
int getReceiveWindowSizeLowerBound() in src/main/java/com/twitter/http2/HttpConnection.java	8	4	1
void updateAllReceiveWindowSizes() in src/main/java/com/twitter/http2/HttpConnection.java	11	4	1
PendingWrite getPendingWrite() in src/main/java/com/twitter/http2/HttpConnection.java	9	4	1
private boolean isRemoteInitiatedId() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	4	4	1
private void halfCloseStream() in src/main/java/com/twitter/http2/HttpConnectionHandler.java	10	4	3
private StreamedHttpRequest createHttpRequest() in src/main/java/com/twitter/http2/HttpStreamDecoder.java	29	4	1
private StreamedHttpResponse createHttpResponse() in src/main/java/com/twitter/http2/HttpStreamDecoder.java	25	4	1
public void validateName() in src/main/java/com/twitter/http2/DefaultHttp2Headers.java	14	4	1
public void operationComplete() in src/main/java/com/twitter/http2/HttpStreamEncoder.java	11	3	1
public Future send() in src/main/java/com/twitter/http2/Pipe.java	17	3	1
public Future receive() in src/main/java/com/twitter/http2/Pipe.java	16	3	0
public void close() in src/main/java/com/twitter/http2/Pipe.java	11	3	0
boolean isRemoteSideClosed() in src/main/java/com/twitter/http2/HttpConnection.java	5	3	1