src/share/vm/services/attachListener.hpp
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src/share/vm/services/attachListener.hpp

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   1 /*
   2  * Copyright (c) 2005, 2011, 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  *


  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_(false);
  63 
  64   // indicates if we have a trigger to start the Attach Listener
  65   static bool is_init_trigger() KERNEL_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<mtInternal> {
 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


 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
 155 
 156 #endif // SHARE_VM_SERVICES_ATTACHLISTENER_HPP
   1 /*
   2  * Copyright (c) 2005, 2012, 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  *


  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()  NOT_SERVICES_RETURN;
  56   static void abort() NOT_SERVICES_RETURN;
  57 
  58   // invoke to perform clean-up tasks when all clients detach
  59   static void detachall() NOT_SERVICES_RETURN;
  60 
  61   // indicates if the Attach Listener needs to be created at startup
  62   static bool init_at_startup() NOT_SERVICES_RETURN_(false);
  63 
  64   // indicates if we have a trigger to start the Attach Listener
  65   static bool is_init_trigger() NOT_SERVICES_RETURN_(false);
  66 
  67 #if !INCLUDE_SERVICES
  68   static bool is_attach_supported()             { return false; }
  69 #else 
  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 // !INCLUDE_SERVICES
  98 };
  99 
 100 #if INCLUDE_SERVICES
 101 class AttachOperation: public CHeapObj<mtInternal> {
 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


 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 // INCLUDE_SERVICES
 155 
 156 #endif // SHARE_VM_SERVICES_ATTACHLISTENER_HPP
src/share/vm/services/attachListener.hpp
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