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annotate src/share/vm/services/attachListener.hpp @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
| author | coleenp |
|---|---|
| date | Thu, 27 Jan 2011 16:11:27 -0800 |
| parents | f95d63e2154a |
| children | bf8517f4e4d0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_SERVICES_ATTACHLISTENER_HPP |
| 26 #define SHARE_VM_SERVICES_ATTACHLISTENER_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "utilities/debug.hpp" | |
| 30 #include "utilities/ostream.hpp" | |
| 31 | |
| 0 | 32 // The AttachListener thread services a queue of operations that are enqueued |
| 33 // by client tools. Each operation is identified by a name and has up to 3 | |
| 34 // arguments. The operation name is mapped to a function which performs the | |
| 35 // operation. The function is called with an outputStream which is can use to | |
| 36 // write any result data (for examples the properties command serializes | |
| 37 // properties names and values to the output stream). When the function | |
| 38 // complets the result value and any result data is returned to the client | |
| 39 // tool. | |
| 40 | |
| 41 #ifndef SERVICES_KERNEL | |
| 42 | |
| 43 class AttachOperation; | |
| 44 | |
| 45 typedef jint (*AttachOperationFunction)(AttachOperation* op, outputStream* out); | |
| 46 | |
| 47 struct AttachOperationFunctionInfo { | |
| 48 const char* name; | |
| 49 AttachOperationFunction func; | |
| 50 }; | |
| 51 #endif // SERVICES_KERNEL | |
| 52 | |
| 53 class AttachListener: AllStatic { | |
| 54 public: | |
| 55 static void init() KERNEL_RETURN; | |
| 56 static void abort() KERNEL_RETURN; | |
| 57 | |
| 58 // invoke to perform clean-up tasks when all clients detach | |
| 59 static void detachall() KERNEL_RETURN; | |
| 60 | |
| 61 // indicates if the Attach Listener needs to be created at startup | |
| 62 static bool init_at_startup() KERNEL_RETURN_(return false;); | |
| 63 | |
| 64 // indicates if we have a trigger to start the Attach Listener | |
| 65 static bool is_init_trigger() KERNEL_RETURN_(return false;); | |
| 66 | |
| 67 #ifdef SERVICES_KERNEL | |
| 68 static bool is_attach_supported() { return false; } | |
| 69 #else // SERVICES_KERNEL | |
| 70 private: | |
| 71 static volatile bool _initialized; | |
| 72 | |
| 73 public: | |
| 74 static bool is_initialized() { return _initialized; } | |
| 75 static void set_initialized() { _initialized = true; } | |
| 76 | |
| 77 // indicates if this VM supports attach-on-demand | |
| 78 static bool is_attach_supported() { return !DisableAttachMechanism; } | |
| 79 | |
| 80 // platform specific initialization | |
| 81 static int pd_init(); | |
| 82 | |
| 83 // platform specific operation | |
| 84 static AttachOperationFunctionInfo* pd_find_operation(const char* name); | |
| 85 | |
| 86 // platform specific flag change | |
| 87 static jint pd_set_flag(AttachOperation* op, outputStream* out); | |
| 88 | |
| 89 // platform specific detachall | |
| 90 static void pd_detachall(); | |
| 91 | |
| 92 // platform specific data dump | |
| 93 static void pd_data_dump(); | |
| 94 | |
| 95 // dequeue the next operation | |
| 96 static AttachOperation* dequeue(); | |
| 97 #endif // SERVICES_KERNEL | |
| 98 }; | |
| 99 | |
| 100 #ifndef SERVICES_KERNEL | |
| 101 class AttachOperation: public CHeapObj { | |
| 102 public: | |
| 103 enum { | |
| 104 name_length_max = 16, // maximum length of name | |
| 105 arg_length_max = 1024, // maximum length of argument | |
| 106 arg_count_max = 3 // maximum number of arguments | |
| 107 }; | |
| 108 | |
| 109 // name of special operation that can be enqueued when all | |
| 110 // clients detach | |
| 111 static char* detachall_operation_name() { return (char*)"detachall"; } | |
| 112 | |
| 113 private: | |
| 114 char _name[name_length_max+1]; | |
| 115 char _arg[arg_count_max][arg_length_max+1]; | |
| 116 | |
| 117 public: | |
| 118 const char* name() const { return _name; } | |
| 119 | |
| 120 // set the operation name | |
| 121 void set_name(char* name) { | |
| 122 assert(strlen(name) <= name_length_max, "exceeds maximum name length"); | |
| 123 strcpy(_name, name); | |
| 124 } | |
| 125 | |
| 126 // get an argument value | |
| 127 const char* arg(int i) const { | |
| 128 assert(i>=0 && i<arg_count_max, "invalid argument index"); | |
| 129 return _arg[i]; | |
| 130 } | |
| 131 | |
| 132 // set an argument value | |
| 133 void set_arg(int i, char* arg) { | |
| 134 assert(i>=0 && i<arg_count_max, "invalid argument index"); | |
| 135 if (arg == NULL) { | |
| 136 _arg[i][0] = '\0'; | |
| 137 } else { | |
| 138 assert(strlen(arg) <= arg_length_max, "exceeds maximum argument length"); | |
| 139 strcpy(_arg[i], arg); | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 // create an operation of a given name | |
| 144 AttachOperation(char* name) { | |
| 145 set_name(name); | |
| 146 for (int i=0; i<arg_count_max; i++) { | |
| 147 set_arg(i, NULL); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 // complete operation by sending result code and any result data to the client | |
| 152 virtual void complete(jint result, bufferedStream* result_stream) = 0; | |
| 153 }; | |
| 154 #endif // SERVICES_KERNEL | |
| 1972 | 155 |
| 156 #endif // SHARE_VM_SERVICES_ATTACHLISTENER_HPP |