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annotate src/share/vm/services/attachListener.hpp @ 14702:d4dd5204c0aa
Merge
author | ehelin |
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date | Fri, 14 Mar 2014 13:27:18 +0100 |
parents | 23c27f9ae1e8 |
children | 4ca6dc0799b6 |
rev | line source |
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0 | 1 /* |
7951 | 2 * Copyright (c) 2005, 2013, 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" | |
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31 #include "utilities/macros.hpp" |
1972 | 32 |
0 | 33 // The AttachListener thread services a queue of operations that are enqueued |
34 // by client tools. Each operation is identified by a name and has up to 3 | |
35 // arguments. The operation name is mapped to a function which performs the | |
36 // operation. The function is called with an outputStream which is can use to | |
37 // write any result data (for examples the properties command serializes | |
38 // properties names and values to the output stream). When the function | |
39 // complets the result value and any result data is returned to the client | |
40 // tool. | |
41 | |
42 class AttachOperation; | |
43 | |
44 typedef jint (*AttachOperationFunction)(AttachOperation* op, outputStream* out); | |
45 | |
46 struct AttachOperationFunctionInfo { | |
47 const char* name; | |
48 AttachOperationFunction func; | |
49 }; | |
50 | |
51 class AttachListener: AllStatic { | |
52 public: | |
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53 static void vm_start() NOT_SERVICES_RETURN; |
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54 static void init() NOT_SERVICES_RETURN; |
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55 static void abort() NOT_SERVICES_RETURN; |
0 | 56 |
57 // invoke to perform clean-up tasks when all clients detach | |
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58 static void detachall() NOT_SERVICES_RETURN; |
0 | 59 |
60 // indicates if the Attach Listener needs to be created at startup | |
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61 static bool init_at_startup() NOT_SERVICES_RETURN_(false); |
0 | 62 |
63 // indicates if we have a trigger to start the Attach Listener | |
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64 static bool is_init_trigger() NOT_SERVICES_RETURN_(false); |
0 | 65 |
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66 #if !INCLUDE_SERVICES |
0 | 67 static bool is_attach_supported() { return false; } |
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68 #else |
0 | 69 private: |
70 static volatile bool _initialized; | |
71 | |
72 public: | |
73 static bool is_initialized() { return _initialized; } | |
74 static void set_initialized() { _initialized = true; } | |
75 | |
76 // indicates if this VM supports attach-on-demand | |
77 static bool is_attach_supported() { return !DisableAttachMechanism; } | |
78 | |
79 // platform specific initialization | |
80 static int pd_init(); | |
81 | |
82 // platform specific operation | |
83 static AttachOperationFunctionInfo* pd_find_operation(const char* name); | |
84 | |
85 // platform specific flag change | |
86 static jint pd_set_flag(AttachOperation* op, outputStream* out); | |
87 | |
88 // platform specific detachall | |
89 static void pd_detachall(); | |
90 | |
91 // platform specific data dump | |
92 static void pd_data_dump(); | |
93 | |
94 // dequeue the next operation | |
95 static AttachOperation* dequeue(); | |
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96 #endif // !INCLUDE_SERVICES |
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97 |
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98 private: |
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99 static bool has_init_error(TRAPS); |
0 | 100 }; |
101 | |
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102 #if INCLUDE_SERVICES |
6197 | 103 class AttachOperation: public CHeapObj<mtInternal> { |
0 | 104 public: |
105 enum { | |
106 name_length_max = 16, // maximum length of name | |
107 arg_length_max = 1024, // maximum length of argument | |
108 arg_count_max = 3 // maximum number of arguments | |
109 }; | |
110 | |
111 // name of special operation that can be enqueued when all | |
112 // clients detach | |
113 static char* detachall_operation_name() { return (char*)"detachall"; } | |
114 | |
115 private: | |
116 char _name[name_length_max+1]; | |
117 char _arg[arg_count_max][arg_length_max+1]; | |
118 | |
119 public: | |
120 const char* name() const { return _name; } | |
121 | |
122 // set the operation name | |
123 void set_name(char* name) { | |
124 assert(strlen(name) <= name_length_max, "exceeds maximum name length"); | |
125 strcpy(_name, name); | |
126 } | |
127 | |
128 // get an argument value | |
129 const char* arg(int i) const { | |
130 assert(i>=0 && i<arg_count_max, "invalid argument index"); | |
131 return _arg[i]; | |
132 } | |
133 | |
134 // set an argument value | |
135 void set_arg(int i, char* arg) { | |
136 assert(i>=0 && i<arg_count_max, "invalid argument index"); | |
137 if (arg == NULL) { | |
138 _arg[i][0] = '\0'; | |
139 } else { | |
140 assert(strlen(arg) <= arg_length_max, "exceeds maximum argument length"); | |
141 strcpy(_arg[i], arg); | |
142 } | |
143 } | |
144 | |
145 // create an operation of a given name | |
146 AttachOperation(char* name) { | |
147 set_name(name); | |
148 for (int i=0; i<arg_count_max; i++) { | |
149 set_arg(i, NULL); | |
150 } | |
151 } | |
152 | |
153 // complete operation by sending result code and any result data to the client | |
154 virtual void complete(jint result, bufferedStream* result_stream) = 0; | |
155 }; | |
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156 #endif // INCLUDE_SERVICES |
1972 | 157 |
158 #endif // SHARE_VM_SERVICES_ATTACHLISTENER_HPP |