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Issue #4331 Close Complete
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Do not dispatch
Better ascii art
improved close impl to be similar to complete

Signed-off-by: Greg Wilkins <gregw@webtide.com>
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@gregw
gregw committed Dec 13, 2019
1 parent a6723a2 commit 1f76c52
Showing 1 changed file with 120 additions and 117 deletions.
237 changes: 120 additions & 117 deletions jetty-server/src/main/java/org/eclipse/jetty/server/HttpOutput.java
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Expand Up @@ -63,58 +63,63 @@ public class HttpOutput extends ServletOutputStream implements Runnable
private static ResourceBundle lStrings = ResourceBundle.getBundle(LSTRING_FILE);

/*
BLOCKING-------write/flush/close------->BLOCKED
| ^ |
| | |
| +-------- onWriteComplete ----------+
|
|setWriteListener
|
v
READY ------ write/flush/close ------> PENDING
^ ^ | |
| | | |
| +----------isReady==true----------+ | |
| | | |
|onWriteComplete | | |onWriteComplete
| | | |
| +----------isReady==false------------+ |
| | | |
| v | v
UNREADY +---ASYNC
TODO rework this for the CLOSE state:
OPEN/BLOCKING----close---------+ CLOSED/BLOCKING
/ | ^ \ ^
swl/ |w |owc \ |
/ v | \ |
| OPEN/BLOCKED --<>close +---->CLOSING/BLOCKED--owc--------+
\ \ /
\ +----owcC------------+
v
> OPEN/READY -----close-----+
/ ^ | \ \
/ /irt |w \ \
/ / v \ \
/ | OPEN/PENDING-|-<>close +--+--+--->CLOSING/PENDING--owc--------+
| \ / | \/ / / / / |
|owc / |owc /\ / / / / |
| / \ v v +--owcC-------+ / / / v
\ | OPEN/ASYNC------close--------+ / +--|->CLOSING/ASYNC----owc-->CLOSED/ASYNC
\ \ \ +--owcC-----------+ / \ ^
\ \irf +--/---owcC-------------+ \irf |
\ v / v |
- OPEN/UNREADY --<>close CLOSING/UNREADY--owc--------+
BLOCKING-------write/flush/close------->BLOCKED
| ^ |
| | |
| +-------- onWriteComplete ----------+
|
|setWriteListener
|
v
READY ------ write/flush/close ------> PENDING
^ ^ | |
| | | |
| +----------isReady==true----------+ | |
| | | |
|onWriteComplete | | |onWriteComplete
| | | |
| +----------isReady==false------------+ |
| | | |
| v | v
UNREADY +---ASYNC
OPEN/BLOCKING---close---------------------------+ CLOSED/BLOCKING
/ | ^ \ ^ ^
/ w | \ / |
/ | owc +------------------------->--owcL-----\---------------------+ |
| v | / / V |
swl OPEN/BLOCKED----close--->CLOSE/BLOCKED----owc----->CLOSING/BLOCKED--owcL------+
\
\
\
V
+->OPEN/READY------close--------------------------+
/ ^ | \
/ / w \
/ / | +------------------------->--owcL----\---------------------------+
| / v / / V |
| irt OPEN/PENDING----close--->CLOSE/PENDING----owc---->CLOSING/PENDING--owcL----+ |
| \ / | | ^ | | |
owc \/ owc irf / irf | |
| /\ | | / | | |
| / V V | / | V V
| irf OPEN/ASYNC------close---------|----------------+ | CLOSED/ASYNC
\ \ | | ^ ^
\ \ | | | |
\ \ | | | |
\ v v v | |
+-OPEN/UNREADY----close--->CLOSE/UNREADY----owc----->CLOSING/UNREADY--owcL---+ |
\ \ |
+------------------------->--owcL--------------------------------+
swl = setWriteListener
w = write
<>close = close sets _completeCallback only.
owc = onWriteComplete(false,null),_completeCallback==null
owcC = onWriteComplete(false,null),_completeCallback!=null
owc = onWriteComplete(false,null)
owcL = onWriteComplete(true,null)
isf = isReady()==false
ist = osReady()==true
close = close or complete(Callback)`
*/
enum ApiState
{
Expand Down Expand Up @@ -380,7 +385,7 @@ void onWriteComplete(boolean last, Throwable failure)
if (release)
releaseBuffer();
if (wake)
_channel.execute(_channel); // TODO can we call directly? Why execute?
_channel.run();
}
}

Expand Down Expand Up @@ -444,8 +449,9 @@ public void complete(Callback callback)
case BLOCKED:
case UNREADY:
case PENDING:
// Output is currently doing an operation, so we just move to state to trigger close when
// that operation completes
// An operation is in progress, so we soft close now
_softClose = true;
// then trigger a close from onWriteComplete
_state = State.CLOSE;
break;
}
Expand All @@ -454,7 +460,7 @@ public void complete(Callback callback)
}

if (LOG.isDebugEnabled())
LOG.debug("close({}) {} s={} e={}, c={}", callback, stateString(), succeeded, error, BufferUtil.toDetailString(content));
LOG.debug("complete({}) {} s={} e={}, c={}", callback, stateString(), succeeded, error, BufferUtil.toDetailString(content));

if (succeeded)
{
Expand Down Expand Up @@ -487,97 +493,94 @@ public void completed()
@Override
public void close() throws IOException
{
// This close is not implemented as a call to close(Callback) with
// a blocking callback because in some cases we need to make this
// call async - ie it returns immediately and the close happens in
// the background

if (_channel.getResponse().isIncluding())
{
if (LOG.isDebugEnabled())
LOG.debug("close() include softclose");
_softClose = true;
flush();
return;
}

ByteBuffer content = null;
Throwable error = null;
Blocker blocker = null;
synchronized (_channelState)
{
if (_onError != null)
{
error = _onError;
if (_onError instanceof IOException)
throw (IOException)_onError;
if (_onError instanceof RuntimeException)
throw (RuntimeException)_onError;
if (_onError instanceof Error)
throw (Error)_onError;
throw new IOException(_onError);
}
else if (_state != State.CLOSED)

switch (_state)
{
switch (_apiState)
{
case UNREADY:
case PENDING:
// An async operation is in progress, so we soft close now
_softClose = true;
case CLOSED:
break;

// If we are OPEN,
if (_state == State.OPEN)
// then trigger a close from onWriteComplete
_state = State.CLOSE;
break;
case CLOSE:
case CLOSING:
switch (_apiState)
{
case BLOCKING:
case BLOCKED:
// block until CLOSED state reached.
blocker = _writeBlocker.acquire();
_closedCallback = Callback.combine(_closedCallback, blocker);
break;

case ASYNC:
case READY:
// We are async, but with no outstanding operation, so we close asynchronously
_apiState = ApiState.PENDING;
_state = State.CLOSING;
content = BufferUtil.hasContent(_aggregate) ? _aggregate : BufferUtil.EMPTY_BUFFER;
break;
default:
// async close with no callbacl, so nothing to do
break;
}
break;

case BLOCKED:
// A blocking operation is in progress.
// If we are still OPEN
if (_state == State.OPEN)
// we will close from onWriteComplete
case OPEN:
switch (_apiState)
{
case BLOCKING:
// Output is idle blocking state, but we still do an async close
_apiState = ApiState.BLOCKED;
_state = State.CLOSING;
blocker = _writeBlocker.acquire();
content = BufferUtil.hasContent(_aggregate) ? _aggregate : BufferUtil.EMPTY_BUFFER;
break;

case BLOCKED:
// An blocking operation is in progress, so we soft close now
_softClose = true;
// then trigger a close from onWriteComplete
_state = State.CLOSE;
// and block until CLOSED
blocker = _writeBlocker.acquire();
_closedCallback = Callback.combine(_closedCallback, blocker);
break;
// and block until it is complete
blocker = _writeBlocker.acquire();
_closedCallback = Callback.combine(_closedCallback, blocker);
break;

case BLOCKING:
// Do a blocking close
blocker = _writeBlocker.acquire();
content = BufferUtil.hasContent(_aggregate) ? _aggregate : BufferUtil.EMPTY_BUFFER;
break;
case ASYNC:
case READY:
// Output is idle in async state, so we can do an async close
_apiState = ApiState.PENDING;
_state = State.CLOSING;
content = BufferUtil.hasContent(_aggregate) ? _aggregate : BufferUtil.EMPTY_BUFFER;
break;

default:
throw new IllegalStateException(stateString());
}
case UNREADY:
case PENDING:
// An async operation is in progress, so we soft close now
_softClose = true;
// then trigger a close from onWriteComplete
_state = State.CLOSE;
break;
}
break;
}
}

if (LOG.isDebugEnabled())
LOG.debug("close() {} e={}, c={}, b={}", stateString(), error, BufferUtil.toDetailString(content), blocker);

// Throw any error
if (error != null)
{
if (error instanceof IOException)
throw (IOException)error;
if (error instanceof RuntimeException)
throw (RuntimeException)error;
if (error instanceof Error)
throw (Error)error;
throw new IOException(error);
}
LOG.debug("close({}) {} e={}, c={}", blocker, stateString(), BufferUtil.toDetailString(content));

if (content == null)
{
if (blocker == null)
// nothing to do or block for.
return;

// Just wait for another close to finish.
// Just wait for some other close to finish.
try (Blocker b = blocker)
{
b.block();
Expand Down

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