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src/java.net.http/share/classes/jdk/internal/net/http/PullPublisher.java

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   1 /*
   2  * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


  86             this.iter = iter;
  87             this.error = throwable;
  88         }
  89 
  90         final class PullTask extends SequentialScheduler.CompleteRestartableTask {
  91             @Override
  92             protected void run() {
  93                 if (completed || cancelled) {
  94                     return;
  95                 }
  96 
  97                 Throwable t = error;
  98                 if (t != null) {
  99                     completed = true;
 100                     pullScheduler.stop();
 101                     subscriber.onError(t);
 102                     return;
 103                 }
 104 
 105                 while (demand.tryDecrement() && !cancelled) {
 106                     T next;
 107                     try {
 108                         if (!iter.hasNext()) {
 109                             break;
 110                         }
 111                         next = iter.next();
 112                     } catch (Throwable t1) {
 113                         completed = true;
 114                         pullScheduler.stop();
 115                         subscriber.onError(t1);
 116                         return;
 117                     }
 118                     subscriber.onNext(next);
 119                 }
 120                 if (!iter.hasNext() && !cancelled) {
 121                     completed = true;
 122                     pullScheduler.stop();
 123                     subscriber.onComplete();
 124                 }
 125             }
 126         }
 127 
 128         @Override
 129         public void request(long n) {
 130             if (cancelled)
 131                 return;  // no-op
 132 
 133             if (n <= 0) {
 134                 error = new IllegalArgumentException("non-positive subscription request: " + n);
 135             } else {
 136                 demand.increase(n);
 137             }
 138             pullScheduler.runOrSchedule();
 139         }
 140 
 141         @Override
 142         public void cancel() {
 143             cancelled = true;
 144         }
 145     }
 146 }
   1 /*
   2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


  86             this.iter = iter;
  87             this.error = throwable;
  88         }
  89 
  90         final class PullTask extends SequentialScheduler.CompleteRestartableTask {
  91             @Override
  92             protected void run() {
  93                 if (completed || cancelled) {
  94                     return;
  95                 }
  96 
  97                 Throwable t = error;
  98                 if (t != null) {
  99                     completed = true;
 100                     pullScheduler.stop();
 101                     subscriber.onError(t);
 102                     return;
 103                 }
 104 
 105                 while (demand.tryDecrement() && !cancelled) {
 106                     if (!iter.hasNext()) {
 107                         break;
 108                     } else {
 109                         subscriber.onNext(iter.next());







 110                     }

 111                 }
 112                 if (!iter.hasNext() && !cancelled) {
 113                     completed = true;
 114                     pullScheduler.stop();
 115                     subscriber.onComplete();
 116                 }
 117             }
 118         }
 119 
 120         @Override
 121         public void request(long n) {
 122             if (cancelled)
 123                 return;  // no-op
 124 
 125             if (n <= 0) {
 126                 error = new IllegalArgumentException("illegal non-positive request:" + n);
 127             } else {
 128                 demand.increase(n);
 129             }
 130             pullScheduler.runOrSchedule();
 131         }
 132 
 133         @Override
 134         public void cancel() {
 135             cancelled = true;
 136         }
 137     }
 138 }
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