1 /*
   2  * Copyright (c) 2014, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.vm.ci.hotspot;
  24 
  25 /**
  26  * An empty implementation for {@link EventProvider}. This implementation is used when no logging is
  27  * requested.
  28  */
  29 final class EmptyEventProvider implements EventProvider {
  30 
  31     static InternalError shouldNotReachHere() {
  32         throw new InternalError("should not reach here");
  33     }
  34 
  35     @Override
  36     public CompilationEvent newCompilationEvent() {
  37         return new EmptyCompilationEvent();
  38     }
  39 
  40     static class EmptyCompilationEvent implements CompilationEvent {
  41         public void commit() {
  42             throw shouldNotReachHere();
  43         }
  44 
  45         public boolean shouldWrite() {
  46             // Events of this class should never been written.
  47             return false;
  48         }
  49 
  50         public void begin() {
  51         }
  52 
  53         public void end() {
  54         }
  55 
  56         public void setMethod(String method) {
  57             throw shouldNotReachHere();
  58         }
  59 
  60         public void setCompileId(int compileId) {
  61             throw shouldNotReachHere();
  62         }
  63 
  64         public void setCompileLevel(int compileLevel) {
  65             throw shouldNotReachHere();
  66         }
  67 
  68         public void setSucceeded(boolean succeeded) {
  69             throw shouldNotReachHere();
  70         }
  71 
  72         public void setIsOsr(boolean isOsr) {
  73             throw shouldNotReachHere();
  74         }
  75 
  76         public void setCodeSize(int codeSize) {
  77             throw shouldNotReachHere();
  78         }
  79 
  80         public void setInlinedBytes(int inlinedBytes) {
  81             throw shouldNotReachHere();
  82         }
  83     }
  84 
  85     @Override
  86     public CompilerFailureEvent newCompilerFailureEvent() {
  87         return new EmptyCompilerFailureEvent();
  88     }
  89 
  90     static class EmptyCompilerFailureEvent implements CompilerFailureEvent {
  91         public void commit() {
  92             throw shouldNotReachHere();
  93         }
  94 
  95         public boolean shouldWrite() {
  96             // Events of this class should never been written.
  97             return false;
  98         }
  99 
 100         public void setCompileId(int compileId) {
 101             throw shouldNotReachHere();
 102         }
 103 
 104         public void setMessage(String message) {
 105             throw shouldNotReachHere();
 106         }
 107     }
 108 
 109 }