#566

Committed 25 Jun 2025 11:19PM UTC coverage: 90.014% (-0.07%) from 90.088%

Build # #566

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Use a corePoolSize of 1 for the scheduler (#127)

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91.6

/methanol/src/main/java/com/github/mizosoft/methanol/internal/flow/AbstractSubscription.java

/*
 * Copyright (c) 2024 Moataz Hussein
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.github.mizosoft.methanol.internal.flow;

import static com.github.mizosoft.methanol.internal.Validate.castNonNull;
import static com.github.mizosoft.methanol.internal.flow.FlowSupport.getAndAddDemand;
import static com.github.mizosoft.methanol.internal.flow.FlowSupport.subtractAndGetDemand;
import static java.util.Objects.requireNonNull;

import java.lang.System.Logger;
import java.lang.System.Logger.Level;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.util.concurrent.Executor;
import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;
import org.checkerframework.checker.nullness.qual.MonotonicNonNull;

/**
 * An abstract {@link Subscription} that implements most of the machinery for execution and
 * backpressure control.
 */
@SuppressWarnings("unused") // VarHandle indirection.
public abstract class AbstractSubscription<T> implements Subscription {
  private static final Logger logger = System.getLogger(AbstractSubscription.class.getName());

  /** Consumer is running or about to run. */
  private static final int RUNNING = 0x1;

  /** Consumer must continue to process potentially missed signals. */
  private static final int KEEP_ALIVE = 0x2;

  /** Subscriber::onSubscribe has been invoked. */
  private static final int SUBSCRIBED = 0x4;

  /** There's a pending error that must be passed downstream if not cancelled. */
  private static final int ERROR = 0x8;

  /** The subscription is cancelled. */
  private static final int CANCELLED = 0x10;

  private static final VarHandle SYNC;
  private static final VarHandle PENDING_EXCEPTION;
  private static final VarHandle DEMAND;

  static {
    var lookup = MethodHandles.lookup();
    try {
      SYNC = lookup.findVarHandle(AbstractSubscription.class, "sync", int.class);
      DEMAND = lookup.findVarHandle(AbstractSubscription.class, "demand", long.class);
      PENDING_EXCEPTION =
          lookup.findVarHandle(AbstractSubscription.class, "pendingException", Throwable.class);
    } catch (NoSuchFieldException | IllegalAccessException e) {
      throw new ExceptionInInitializerError(e);
    }
  }

  private final Subscriber<? super T> downstream;
  private final Executor executor;
  private volatile int sync;
  private volatile long demand;
  private volatile @MonotonicNonNull Throwable pendingException;

  protected AbstractSubscription(Subscriber<? super T> downstream, Executor executor) {
    this.downstream = requireNonNull(downstream);
    this.executor = requireNonNull(executor);
  }

  @Override
  public final void request(long n) {
    if (n > 0) {
      getAndAddDemand(this, DEMAND, n);
      fireOrKeepAlive();
    } else {
      fireOrKeepAliveOnError(FlowSupport.illegalRequest());
    }
  }

  @Override
  public final void cancel() {
    if ((getAndBitwiseOrSync(CANCELLED) & CANCELLED) == 0) {
      guardedAbort(true);
      consumePendingException();
    }
  }

  public void fireOrKeepAlive() {
    if ((sync & KEEP_ALIVE) == 0
        && (getAndBitwiseOrSync(RUNNING | KEEP_ALIVE) & (RUNNING | CANCELLED)) == 0) {
      fire();
    }
  }

  public void fireOrKeepAliveOnNext() {
    if (demand > 0) {
      fireOrKeepAlive();
    }
  }

  public void fireOrKeepAliveOnError(Throwable exception) {
    requireNonNull(exception);

    // Make sure exceptions are reported even if they can't be passed on downstream. This is
    // maintained by two sides: producer (this method) and consumer (terminal methods like cancel(),
    // cancelOnError(...) and cancelOnComplete(...)).
    boolean produced;
    if ((produced = PENDING_EXCEPTION.compareAndSet(this, null, exception))
        && (getAndBitwiseOrSync(RUNNING | KEEP_ALIVE | ERROR) & (RUNNING | CANCELLED)) == 0) {
      fire();
    } else if (!produced) {
      FlowSupport.onDroppedException(exception);
    }
  }

  private void fire() {
    try {
      executor.execute(this::drain);
    } catch (RuntimeException | Error e) {
      // This is a problem because we cannot call downstream here as that would ruin the execution
      // context guarantee. SubmissionPublisher's behaviour here is followed (cancel & rethrow).
      logger.log(Level.ERROR, "Couldn't execute subscription's signaller task", e);
      cancel();
      throw e;
    }
  }

  /**
   * Emits at most {@code emit} items to downstream using {@link #submitOnNext( Subscriber, Object)}
   * as long as it returns {@code true}. The actual number of emitted items is returned, may be 0 in
   * case of cancellation or if no items are emitted, perhaps due to lack thereof, or if {@code
   * emit} itself is zero. If the underlying source is finished, the subscriber is completed with
   * {@link #cancelOnComplete(Subscriber)}.
   */
  protected abstract long emit(Subscriber<? super T> downstream, long emit);

  private long guardedEmit(Subscriber<? super T> downstream, long emit) {
    try {
      return emit(downstream, emit);
    } catch (Throwable t) {
      cancelOnError(downstream, t, true);
      return -1;
    }
  }

  /**
   * Releases resources held by this subscription. {@code flowInterrupted} tells whether
   * cancellation was due to flow interruption by downstream (e.g. calling {@code cancel()} or
   * throwing from {@code onNext} or {@code onSubscribe}), or due to ending the normal flow of
   * signals (onSubscribe -> onNext* -> (onError | onComplete)).
   */
  protected void abort(boolean flowInterrupted) {}

  private void guardedAbort(boolean flowInterrupted) {
    try {
      abort(flowInterrupted);
    } catch (Throwable t) {
      logger.log(Level.WARNING, "Exception thrown during subscription cancellation", t);
    }
  }

  private void consumePendingException() {
    var exception =
        (Throwable) PENDING_EXCEPTION.getAndSet(this, ConsumedPendingException.INSTANCE);
    if (exception != null && exception != ConsumedPendingException.INSTANCE) {
      FlowSupport.onDroppedException(exception);
    }
  }

  /**
   * Returns {@code true} if this subscription is cancelled. {@code false} result is immediately
   * outdated. Can be used by implementation to halt producing items in case the subscription was
   * asynchronously cancelled.
   */
  protected final boolean isCancelled() {
    return (sync & CANCELLED) != 0;
  }

  /**
   * Returns {@code true} if the subscriber is to be completed exceptionally. {@code false} result
   * is immediately outdated. Can be used by implementation to halt producing items in case the
   * subscription was asynchronously signalled with an error.
   */
  protected final boolean hasPendingErrors() {
    return (sync & ERROR) != 0;
  }

  /**
   * Calls downstream's {@code onError} with the given exception after cancelling this subscription.
   * {@code flowInterrupted} tells whether the error interrupted the normal flow of signals.
   */
  protected final void cancelOnError(
      Subscriber<? super T> downstream, Throwable exception, boolean flowInterrupted) {
    if ((getAndBitwiseOrSync(CANCELLED) & CANCELLED) == 0) {
      guardedAbort(flowInterrupted);
      if (flowInterrupted) { // Otherwise drain() has already consumed the pending exception.
        consumePendingException();
      }

      try {
        downstream.onError(exception);
      } catch (Throwable t) {
        t.addSuppressed(exception);
        logger.log(Level.WARNING, "Exception thrown by subscriber's onError", t);
      }
    } else {
      FlowSupport.onDroppedException(exception);
    }
  }

  /** Calls downstream's {@code onComplete} after cancelling this subscription. */
  protected final void cancelOnComplete(Subscriber<? super T> downstream) {
    if ((getAndBitwiseOrSync(CANCELLED) & CANCELLED) == 0) {
      guardedAbort(false);
      consumePendingException();
      try {
        downstream.onComplete();
      } catch (Throwable t) {
        logger.log(
            Level.WARNING, () -> "Exception thrown by subscriber's onComplete: " + downstream, t);
      }
    }
  }

  /**
   * Submits given item to the downstream, returning {@code false} and cancelling on failure. {@code
   * false} is also returned if the subscription is already cancelled or has pending errors. On such
   * cases, caller should stop emitting items.
   */
  protected final boolean submitOnNext(Subscriber<? super T> downstream, T item) {
    if ((sync & (ERROR | CANCELLED)) == 0) {
      try {
        downstream.onNext(item);
        return true;
      } catch (Throwable t) {
        cancelOnError(downstream, t, true);
      }
    }
    return false;
  }

  private void drain() {
    int s;
    var d = downstream;
    subscribeOnDrain(d);
    for (long x = 0L, r = demand; ((s = sync) & CANCELLED) == 0; ) {
      long emitted;
      int unsetBit;
      if ((s & ERROR) != 0) {
        var exception =
            (Throwable) PENDING_EXCEPTION.getAndSet(this, ConsumedPendingException.INSTANCE);
        cancelOnError(d, castNonNull(exception), false);
      } else if ((emitted = guardedEmit(d, r - x)) > 0L) {
        x += emitted;
      } else if (emitted < 0) {
        return; // Emit failed and the subscriber is completed exceptionally.
      } else if (x > 0) {
        // Flush satisfied demand.
        r = subtractAndGetDemand(this, DEMAND, x);
        x = 0L;
      } else if (r == (r = demand) // Check no new demand has arrived.
          && SYNC.compareAndSet(
              this, s, s & ~(unsetBit = (s & KEEP_ALIVE) == 0 ? RUNNING : KEEP_ALIVE))
          && unsetBit == RUNNING) { // Exit or consume KEEP_ALIVE.
        return;
      }
    }
  }

  private void subscribeOnDrain(Subscriber<? super T> downstream) {
    if ((sync & SUBSCRIBED) == 0
        && (getAndBitwiseOrSync(SUBSCRIBED) & (SUBSCRIBED | CANCELLED)) == 0) {
      try {
        downstream.onSubscribe(this);
      } catch (Throwable t) {
        cancelOnError(downstream, t, true);
      }
    }
  }

  private int getAndBitwiseOrSync(int bits) {
    return (int) SYNC.getAndBitwiseOr(this, bits);
  }

  protected long currentDemand() {
    return demand;
  }

  private static final class ConsumedPendingException extends Exception {
    @SuppressWarnings("StaticAssignmentOfThrowable") // Not thrown, just used for CAS control.
    static final ConsumedPendingException INSTANCE = new ConsumedPendingException();

    private ConsumedPendingException() {
      super("", null, false, false);
    }
  }
}

1	/*
2	* Copyright (c) 2024 Moataz Hussein
3	*
4	* Permission is hereby granted, free of charge, to any person obtaining a copy
5	* of this software and associated documentation files (the "Software"), to deal
6	* in the Software without restriction, including without limitation the rights
7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8	* copies of the Software, and to permit persons to whom the Software is
9	* furnished to do so, subject to the following conditions:
10	*
11	* The above copyright notice and this permission notice shall be included in all
12	* copies or substantial portions of the Software.
13	*
14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20	* SOFTWARE.
21	*/
22
23	package com.github.mizosoft.methanol.internal.flow;
24
25	import static com.github.mizosoft.methanol.internal.Validate.castNonNull;
26	import static com.github.mizosoft.methanol.internal.flow.FlowSupport.getAndAddDemand;
27	import static com.github.mizosoft.methanol.internal.flow.FlowSupport.subtractAndGetDemand;
28	import static java.util.Objects.requireNonNull;
29
30	import java.lang.System.Logger;
31	import java.lang.System.Logger.Level;
32	import java.lang.invoke.MethodHandles;
33	import java.lang.invoke.VarHandle;
34	import java.util.concurrent.Executor;
35	import java.util.concurrent.Flow.Subscriber;
36	import java.util.concurrent.Flow.Subscription;
37	import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
38
39	/**
40	* An abstract {@link Subscription} that implements most of the machinery for execution and
41	* backpressure control.
42	*/
43	@SuppressWarnings("unused") // VarHandle indirection.
44	public abstract class AbstractSubscription<T> implements Subscription {
45	private static final Logger logger = System.getLogger(AbstractSubscription.class.getName());	1✔
46
47	/** Consumer is running or about to run. */
48	private static final int RUNNING = 0x1;
49
50	/** Consumer must continue to process potentially missed signals. */
51	private static final int KEEP_ALIVE = 0x2;
52
53	/** Subscriber::onSubscribe has been invoked. */
54	private static final int SUBSCRIBED = 0x4;
55
56	/** There's a pending error that must be passed downstream if not cancelled. */
57	private static final int ERROR = 0x8;
58
59	/** The subscription is cancelled. */
60	private static final int CANCELLED = 0x10;
61
62	private static final VarHandle SYNC;
63	private static final VarHandle PENDING_EXCEPTION;
64	private static final VarHandle DEMAND;
65
66	static {
67	var lookup = MethodHandles.lookup();	1✔
68	try {
69	SYNC = lookup.findVarHandle(AbstractSubscription.class, "sync", int.class);	1✔
70	DEMAND = lookup.findVarHandle(AbstractSubscription.class, "demand", long.class);	1✔
71	PENDING_EXCEPTION =	1✔
72	lookup.findVarHandle(AbstractSubscription.class, "pendingException", Throwable.class);	1✔
73	} catch (NoSuchFieldException \| IllegalAccessException e) {	×
74	throw new ExceptionInInitializerError(e);	×
75	}	1✔
76	}	1✔
77
78	private final Subscriber<? super T> downstream;
79	private final Executor executor;
80	private volatile int sync;
81	private volatile long demand;
82	private volatile @MonotonicNonNull Throwable pendingException;
83
84	protected AbstractSubscription(Subscriber<? super T> downstream, Executor executor) {	1✔
85	this.downstream = requireNonNull(downstream);	1✔
86	this.executor = requireNonNull(executor);	1✔
87	}	1✔
88
89	@Override
90	public final void request(long n) {
91	if (n > 0) {	1✔
92	getAndAddDemand(this, DEMAND, n);	1✔
93	fireOrKeepAlive();	1✔
94	} else {
95	fireOrKeepAliveOnError(FlowSupport.illegalRequest());	1✔
96	}
97	}	1✔
98
99	@Override
100	public final void cancel() {
101	if ((getAndBitwiseOrSync(CANCELLED) & CANCELLED) == 0) {	1✔
102	guardedAbort(true);	1✔
103	consumePendingException();	1✔
104	}
105	}	1✔
106
107	public void fireOrKeepAlive() {
108	if ((sync & KEEP_ALIVE) == 0	1✔
109	&& (getAndBitwiseOrSync(RUNNING \| KEEP_ALIVE) & (RUNNING \| CANCELLED)) == 0) {	1✔
110	fire();	1✔
111	}
112	}	1✔
113
114	public void fireOrKeepAliveOnNext() {
115	if (demand > 0) {	1✔
116	fireOrKeepAlive();	1✔
117	}
118	}	1✔
119
120	public void fireOrKeepAliveOnError(Throwable exception) {
121	requireNonNull(exception);	1✔
122
123	// Make sure exceptions are reported even if they can't be passed on downstream. This is
124	// maintained by two sides: producer (this method) and consumer (terminal methods like cancel(),
125	// cancelOnError(...) and cancelOnComplete(...)).
126	boolean produced;
127	if ((produced = PENDING_EXCEPTION.compareAndSet(this, null, exception))	1✔
128	&& (getAndBitwiseOrSync(RUNNING \| KEEP_ALIVE \| ERROR) & (RUNNING \| CANCELLED)) == 0) {	1✔
129	fire();	1✔
130	} else if (!produced) {	1✔
131	FlowSupport.onDroppedException(exception);	1✔
132	}
133	}	1✔
134
135	private void fire() {
136	try {
137	executor.execute(this::drain);	1✔
138	} catch (RuntimeException \| Error e) {	1✔
139	// This is a problem because we cannot call downstream here as that would ruin the execution
140	// context guarantee. SubmissionPublisher's behaviour here is followed (cancel & rethrow).
141	logger.log(Level.ERROR, "Couldn't execute subscription's signaller task", e);	1✔
142	cancel();	1✔
143	throw e;	1✔
144	}	1✔
145	}	1✔
146
147	/**
148	* Emits at most {@code emit} items to downstream using {@link #submitOnNext( Subscriber, Object)}
149	* as long as it returns {@code true}. The actual number of emitted items is returned, may be 0 in
150	* case of cancellation or if no items are emitted, perhaps due to lack thereof, or if {@code
151	* emit} itself is zero. If the underlying source is finished, the subscriber is completed with
152	* {@link #cancelOnComplete(Subscriber)}.
153	*/
154	protected abstract long emit(Subscriber<? super T> downstream, long emit);
155
156	private long guardedEmit(Subscriber<? super T> downstream, long emit) {
157	try {
158	return emit(downstream, emit);	1✔
159	} catch (Throwable t) {	1✔
160	cancelOnError(downstream, t, true);	1✔
161	return -1;	1✔
162	}
163	}
164
165	/**
166	* Releases resources held by this subscription. {@code flowInterrupted} tells whether
167	* cancellation was due to flow interruption by downstream (e.g. calling {@code cancel()} or
168	* throwing from {@code onNext} or {@code onSubscribe}), or due to ending the normal flow of
169	* signals (onSubscribe -> onNext* -> (onError \| onComplete)).
170	*/
171	protected void abort(boolean flowInterrupted) {}	1✔
172
173	private void guardedAbort(boolean flowInterrupted) {
174	try {
175	abort(flowInterrupted);	1✔
176	} catch (Throwable t) {	1✔
177	logger.log(Level.WARNING, "Exception thrown during subscription cancellation", t);	1✔
178	}	1✔
179	}	1✔
180
181	private void consumePendingException() {
182	var exception =	1✔
183	(Throwable) PENDING_EXCEPTION.getAndSet(this, ConsumedPendingException.INSTANCE);	1✔
184	if (exception != null && exception != ConsumedPendingException.INSTANCE) {	1✔
UNCOV 185	FlowSupport.onDroppedException(exception);	×
186	}
187	}	1✔
188
189	/**
190	* Returns {@code true} if this subscription is cancelled. {@code false} result is immediately
191	* outdated. Can be used by implementation to halt producing items in case the subscription was
192	* asynchronously cancelled.
193	*/
194	protected final boolean isCancelled() {
195	return (sync & CANCELLED) != 0;	1✔
196	}
197
198	/**
199	* Returns {@code true} if the subscriber is to be completed exceptionally. {@code false} result
200	* is immediately outdated. Can be used by implementation to halt producing items in case the
201	* subscription was asynchronously signalled with an error.
202	*/
203	protected final boolean hasPendingErrors() {
204	return (sync & ERROR) != 0;	1✔
205	}
206
207	/**
208	* Calls downstream's {@code onError} with the given exception after cancelling this subscription.
209	* {@code flowInterrupted} tells whether the error interrupted the normal flow of signals.
210	*/
211	protected final void cancelOnError(
212	Subscriber<? super T> downstream, Throwable exception, boolean flowInterrupted) {
213	if ((getAndBitwiseOrSync(CANCELLED) & CANCELLED) == 0) {	1✔
214	guardedAbort(flowInterrupted);	1✔
215	if (flowInterrupted) { // Otherwise drain() has already consumed the pending exception.	1✔
216	consumePendingException();	1✔
217	}
218
219	try {
220	downstream.onError(exception);	1✔
221	} catch (Throwable t) {	×
222	t.addSuppressed(exception);	×
223	logger.log(Level.WARNING, "Exception thrown by subscriber's onError", t);	×
224	}	1✔
225	} else {
226	FlowSupport.onDroppedException(exception);	×
227	}
228	}	1✔
229
230	/** Calls downstream's {@code onComplete} after cancelling this subscription. */
231	protected final void cancelOnComplete(Subscriber<? super T> downstream) {
232	if ((getAndBitwiseOrSync(CANCELLED) & CANCELLED) == 0) {	1✔
233	guardedAbort(false);	1✔
234	consumePendingException();	1✔
235	try {
236	downstream.onComplete();	1✔
237	} catch (Throwable t) {	×
238	logger.log(	×
239	Level.WARNING, () -> "Exception thrown by subscriber's onComplete: " + downstream, t);	×
240	}	1✔
241	}
242	}	1✔
243
244	/**
245	* Submits given item to the downstream, returning {@code false} and cancelling on failure. {@code
246	* false} is also returned if the subscription is already cancelled or has pending errors. On such
247	* cases, caller should stop emitting items.
248	*/
249	protected final boolean submitOnNext(Subscriber<? super T> downstream, T item) {
250	if ((sync & (ERROR \| CANCELLED)) == 0) {	1✔
251	try {
252	downstream.onNext(item);	1✔
253	return true;	1✔
254	} catch (Throwable t) {	1✔
255	cancelOnError(downstream, t, true);	1✔
256	}
257	}
258	return false;	1✔
259	}
260
261	private void drain() {
262	int s;
263	var d = downstream;	1✔
264	subscribeOnDrain(d);	1✔
265	for (long x = 0L, r = demand; ((s = sync) & CANCELLED) == 0; ) {	1✔
266	long emitted;
267	int unsetBit;
268	if ((s & ERROR) != 0) {	1✔
269	var exception =	1✔
270	(Throwable) PENDING_EXCEPTION.getAndSet(this, ConsumedPendingException.INSTANCE);	1✔
271	cancelOnError(d, castNonNull(exception), false);	1✔
272	} else if ((emitted = guardedEmit(d, r - x)) > 0L) {	1✔
273	x += emitted;	1✔
274	} else if (emitted < 0) {	1✔
275	return; // Emit failed and the subscriber is completed exceptionally.	1✔
276	} else if (x > 0) {	1✔
277	// Flush satisfied demand.
278	r = subtractAndGetDemand(this, DEMAND, x);	1✔
279	x = 0L;	1✔
280	} else if (r == (r = demand) // Check no new demand has arrived.	1✔
281	&& SYNC.compareAndSet(	1✔
282	this, s, s & ~(unsetBit = (s & KEEP_ALIVE) == 0 ? RUNNING : KEEP_ALIVE))	1✔
283	&& unsetBit == RUNNING) { // Exit or consume KEEP_ALIVE.
284	return;	1✔
285	}
286	}	1✔
287	}	1✔
288
289	private void subscribeOnDrain(Subscriber<? super T> downstream) {
290	if ((sync & SUBSCRIBED) == 0	1✔
291	&& (getAndBitwiseOrSync(SUBSCRIBED) & (SUBSCRIBED \| CANCELLED)) == 0) {	1✔
292	try {
293	downstream.onSubscribe(this);	1✔
294	} catch (Throwable t) {	1✔
295	cancelOnError(downstream, t, true);	1✔
296	}	1✔
297	}
298	}	1✔
299
300	private int getAndBitwiseOrSync(int bits) {
301	return (int) SYNC.getAndBitwiseOr(this, bits);	1✔
302	}
303
304	protected long currentDemand() {
305	return demand;	1✔
306	}
307
308	private static final class ConsumedPendingException extends Exception {
309	@SuppressWarnings("StaticAssignmentOfThrowable") // Not thrown, just used for CAS control.
310	static final ConsumedPendingException INSTANCE = new ConsumedPendingException();	1✔
311
312	private ConsumedPendingException() {
313	super("", null, false, false);	1✔
314	}	1✔
315	}
316	}

mizosoft / methanol / #566

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