1 /*
   2  * Copyright (c) 2020, 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
  23  * questions.
  24  */
  25 package jdk.incubator.jpackage.internal;
  26 
  27 import java.io.IOException;
  28 import java.util.function.Consumer;
  29 import java.util.function.Supplier;
  30 
  31 public final class RetryExecutor {
  32     RetryExecutor() {
  33         setMaxAttemptsCount(5);
  34         setAttemptTimeoutMillis(2 * 1000);
  35     }
  36 
  37     RetryExecutor setMaxAttemptsCount(int v) {
  38         attempts = v;
  39         return this;
  40     }
  41 
  42     RetryExecutor setAttemptTimeoutMillis(int v) {
  43         timeoutMillis = v;
  44         return this;
  45     }
  46 
  47     RetryExecutor setExecutorInitializer(Consumer<Executor> v) {
  48         executorInitializer = v;
  49         return this;
  50     }
  51 
  52     void abort() {
  53         aborted = true;
  54     }
  55 
  56     void stop() {
  57         stop = true;
  58     }
  59 
  60     static RetryExecutor retryOnKnownErrorMessage(String v) {
  61         RetryExecutor result = new RetryExecutor();
  62         return result.setExecutorInitializer(exec -> {
  63             exec.setOutputConsumer(output -> {
  64                 if (!output.anyMatch(v::equals)) {
  65                     result.abort();
  66                 }
  67             });
  68         });
  69     }
  70 
  71     void execute(String cmdline[]) throws IOException {
  72         executeLoop(() -> Executor.of(cmdline));
  73     }
  74 
  75     void execute(ProcessBuilder pb) throws IOException {
  76         executeLoop(() -> Executor.of(pb));
  77     }
  78 
  79     private void executeLoop(Supplier<Executor> execSupplier) throws IOException {
  80         aborted = false;
  81         stop = false;
  82         for (;;) {
  83             try {
  84                 if (stop) {
  85                     break;
  86                 }
  87 
  88                 Executor exec = execSupplier.get();
  89                 if (executorInitializer != null) {
  90                     executorInitializer.accept(exec);
  91                 }
  92                 exec.executeExpectSuccess();
  93                 break;
  94             } catch (IOException ex) {
  95                 if (aborted || (--attempts) <= 0) {
  96                     throw ex;
  97                 }
  98             }
  99 
 100             try {
 101                 Thread.sleep(timeoutMillis);
 102             } catch (InterruptedException ex) {
 103                 Log.verbose(ex);
 104                 throw new RuntimeException(ex);
 105             }
 106         }
 107     }
 108 
 109     private Consumer<Executor> executorInitializer;
 110     private boolean aborted;
 111     private boolean stop;
 112     private int attempts;
 113     private int timeoutMillis;
 114 }
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