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Lines changed: 33 additions & 29 deletions

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channels/src/main/java/com/softwaremill/jox/Select.java

Lines changed: 33 additions & 29 deletions
Original file line numberDiff line numberDiff line change
@@ -51,7 +51,7 @@ public class Select {
5151
* <p>If no clauses are given, throws {@link ChannelDoneException}.
5252
*
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* @param clauses The clauses, from which one will be selected. Array must not be empty or
54-
* {@code null} and can't contain {@code null} values.
54+
* {@code null} and can't contain {@code null} values.
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* @return The value returned by the selected clause.
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* @throws ChannelClosedException When any of the channels is closed (done or in error).
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*/
@@ -76,9 +76,9 @@ public static <U> U select(SelectClause<? extends U>... clauses) throws Interrup
7676
* <p>If no clauses are given, returns {@link ChannelDone}.
7777
*
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* @param clauses The clauses, from which one will be selected. Array must not be empty or
79-
* {@code null} and can't contain {@code null} values.
79+
* {@code null} and can't contain {@code null} values.
8080
* @return Either the value returned by the selected clause, or {@link ChannelClosed}, when any
81-
* of the channels is closed (done or in error).
81+
* of the channels is closed (done or in error).
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*/
8383
@SafeVarargs
8484
public static <U> Object selectOrClosed(SelectClause<? extends U>... clauses)
@@ -122,9 +122,9 @@ public static <U> Object selectOrClosed(SelectClause<? extends U>... clauses)
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*
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* @param timeout The maximum time to wait for a clause to be selected.
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* @param clauses The clauses, from which one will be selected. Array must not be empty or
125-
* {@code null} and can't contain {@code null} values.
125+
* {@code null} and can't contain {@code null} values.
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* @return The value returned by the selected clause.
127-
* @throws TimeoutException When the timeout elapses before any clause can be selected.
127+
* @throws TimeoutException When the timeout elapses before any clause can be selected.
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* @throws InterruptedException When the current thread is interrupted.
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*/
130130
@SafeVarargs
@@ -154,12 +154,12 @@ public static <U> U selectWithin(Duration timeout, SelectClause<? extends U>...
154154
*
155155
* <p>If the timeout elapses before any clause can be completed, returns the timeout value.
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*
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* @param timeout The maximum time to wait for a clause to be selected.
157+
* @param timeout The maximum time to wait for a clause to be selected.
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* @param timeoutValue The value to return if the timeout elapses.
159-
* @param clauses The clauses, from which one will be selected. Array must not be empty or
160-
* {@code null} and can't contain {@code null} values.
159+
* @param clauses The clauses, from which one will be selected. Array must not be empty or
160+
* {@code null} and can't contain {@code null} values.
161161
* @return Either the value returned by the selected clause, the timeout value when timeout
162-
* occurs, or {@link ChannelClosed} when any of the channels is closed (done or in error).
162+
* occurs, or {@link ChannelClosed} when any of the channels is closed (done or in error).
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* @throws InterruptedException When the current thread is interrupted.
164164
*/
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@SafeVarargs
@@ -221,9 +221,8 @@ private static void joinUninterruptibly(Thread thread) throws InterruptedExcepti
221221
private static <U> Object doSelectOrClosed(SelectClause<? extends U>... clauses)
222222
throws InterruptedException {
223223
// short-circuiting if any of the channels is in error; otherwise, we might have selected a
224-
// clause, for which
225-
// a value was available immediately - even though a channel for a clause appearing later
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// was in error
224+
// clause, for which a value was available immediately - even though a channel for a clause
225+
// appearing later was in error
227226
var anyError = getAnyChannelInError(clauses);
228227
if (anyError != null) {
229228
return anyError;
@@ -290,9 +289,15 @@ public static <T> SelectClause<T> defaultClause(Supplier<T> callback) {
290289

291290
class SelectInstance {
292291
/**
293-
* Possible states: - one of {@link SelectState} - {@link Thread} to wake up - {@link
294-
* ChannelClosed} - a {@link List} of clauses to re-register - when selected, {@link
295-
* SelectClause} (during registration) or {@link StoredSelectClause} (with suspension)
292+
* Possible states:
293+
* <ul>
294+
* <li>one of {@link SelectState}</li>
295+
* <li>{@link Thread} to wake up</li>
296+
* <li>{@link ChannelClosed}</li>
297+
* <li>a {@link List} of clauses to re-register - when selected</li>
298+
* <li>{@link SelectClause} (during registration)</li>
299+
* <li>{@link StoredSelectClause} (with suspension)</li>
300+
* </ul>
296301
*/
297302
private volatile Object state = SelectState.REGISTERING;
298303

@@ -331,7 +336,7 @@ class SelectInstance {
331336
* registered.
332337
*
333338
* @return {@code true}, if the registration was successful, and the clause has been stored.
334-
* {@code false}, if the channel is closed, or the clause has been immediately selected.
339+
* {@code false}, if the channel is closed, or the clause has been immediately selected.
335340
*/
336341
@SuppressWarnings("BooleanMethodIsAlwaysInverted")
337342
<U> boolean register(SelectClause<U> clause) {
@@ -365,18 +370,17 @@ <U> boolean register(SelectClause<U> clause) {
365370

366371
/**
367372
* @param allRendezvous If channels for all clauses are rendezvous channels. In such a case,
368-
* busy-looping is initially used, instead of blocking.
373+
* busy-looping is initially used, instead of blocking.
369374
* @return Either the value returned by the selected clause (which can include {@link
370-
* RestartSelectMarker#RESTART}), or {@link ChannelClosed}, when any of the channels is
371-
* closed.
375+
* RestartSelectMarker#RESTART}), or {@link ChannelClosed}, when any of the channels is
376+
* closed.
372377
*/
373378
Object checkStateAndWait(boolean allRendezvous) throws InterruptedException {
374379
while (true) {
375380
var currentState = state;
376381
if (currentState == SelectState.REGISTERING) {
377382
// registering done, waiting until a clause is selected - setting the thread to wake
378-
// up as the state
379-
// we won't leave this case until the state is changed from Thread
383+
// up as the state we won't leave this case until the state is changed from Thread
380384
var currentThread = Thread.currentThread();
381385
if (STATE.compareAndSet(this, SelectState.REGISTERING, currentThread)) {
382386
var spinIterations = allRendezvous ? Continuation.RENDEZVOUS_SPINS : 0;
@@ -397,8 +401,8 @@ Object checkStateAndWait(boolean allRendezvous) throws InterruptedException {
397401
throw new InterruptedException();
398402
} else {
399403
// another thread already changed the state; setting the
400-
// interrupt status (so that
401-
// the next blocking operation throws), and continuing
404+
// interrupt status (so that the next blocking operation
405+
// throws), and continuing
402406
Thread.currentThread().interrupt();
403407
}
404408
}
@@ -426,8 +430,8 @@ Object checkStateAndWait(boolean allRendezvous) throws InterruptedException {
426430

427431
if (!register(clause)) {
428432
// channel is closed, or clause was selected - in both cases, no point
429-
// in further
430-
// re-registrations; the state should be appropriately updated
433+
// in further re-registrations; the state should be appropriately
434+
// updated
431435
break;
432436
}
433437
}
@@ -475,8 +479,8 @@ private void cleanup(SelectClause<?> selected) {
475479

476480
/**
477481
* @return {@code true} if the given clause was successfully selected, {@code false} otherwise
478-
* (a channel is closed, another clause is selected, registration is in progress, select is
479-
* interrupted).
482+
* (a channel is closed, another clause is selected, registration is in progress, select is
483+
* interrupted).
480484
*/
481485
boolean trySelect(StoredSelectClause storedSelectClause) {
482486
while (true) {
@@ -527,8 +531,8 @@ boolean trySelect(StoredSelectClause storedSelectClause) {
527531

528532
/**
529533
* @return {@code true} when the given {@code channelClosed} has been set as the new state of
530-
* the select. {@code false}, if another clause has already been selected, or if the channel
531-
* is already closed.
534+
* the select. {@code false}, if another clause has already been selected, or if the channel
535+
* is already closed.
532536
*/
533537
boolean channelClosed(ChannelClosed channelClosed) {
534538
while (true) {

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