Mercurial > hg > truffle
diff src/share/vm/services/attachListener.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/services/attachListener.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,147 @@ +/* + * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// The AttachListener thread services a queue of operations that are enqueued +// by client tools. Each operation is identified by a name and has up to 3 +// arguments. The operation name is mapped to a function which performs the +// operation. The function is called with an outputStream which is can use to +// write any result data (for examples the properties command serializes +// properties names and values to the output stream). When the function +// complets the result value and any result data is returned to the client +// tool. + +#ifndef SERVICES_KERNEL + +class AttachOperation; + +typedef jint (*AttachOperationFunction)(AttachOperation* op, outputStream* out); + +struct AttachOperationFunctionInfo { + const char* name; + AttachOperationFunction func; +}; +#endif // SERVICES_KERNEL + +class AttachListener: AllStatic { + public: + static void init() KERNEL_RETURN; + static void abort() KERNEL_RETURN; + + // invoke to perform clean-up tasks when all clients detach + static void detachall() KERNEL_RETURN; + + // indicates if the Attach Listener needs to be created at startup + static bool init_at_startup() KERNEL_RETURN_(return false;); + + // indicates if we have a trigger to start the Attach Listener + static bool is_init_trigger() KERNEL_RETURN_(return false;); + +#ifdef SERVICES_KERNEL + static bool is_attach_supported() { return false; } +#else // SERVICES_KERNEL + private: + static volatile bool _initialized; + + public: + static bool is_initialized() { return _initialized; } + static void set_initialized() { _initialized = true; } + + // indicates if this VM supports attach-on-demand + static bool is_attach_supported() { return !DisableAttachMechanism; } + + // platform specific initialization + static int pd_init(); + + // platform specific operation + static AttachOperationFunctionInfo* pd_find_operation(const char* name); + + // platform specific flag change + static jint pd_set_flag(AttachOperation* op, outputStream* out); + + // platform specific detachall + static void pd_detachall(); + + // platform specific data dump + static void pd_data_dump(); + + // dequeue the next operation + static AttachOperation* dequeue(); +#endif // SERVICES_KERNEL +}; + +#ifndef SERVICES_KERNEL +class AttachOperation: public CHeapObj { + public: + enum { + name_length_max = 16, // maximum length of name + arg_length_max = 1024, // maximum length of argument + arg_count_max = 3 // maximum number of arguments + }; + + // name of special operation that can be enqueued when all + // clients detach + static char* detachall_operation_name() { return (char*)"detachall"; } + + private: + char _name[name_length_max+1]; + char _arg[arg_count_max][arg_length_max+1]; + + public: + const char* name() const { return _name; } + + // set the operation name + void set_name(char* name) { + assert(strlen(name) <= name_length_max, "exceeds maximum name length"); + strcpy(_name, name); + } + + // get an argument value + const char* arg(int i) const { + assert(i>=0 && i<arg_count_max, "invalid argument index"); + return _arg[i]; + } + + // set an argument value + void set_arg(int i, char* arg) { + assert(i>=0 && i<arg_count_max, "invalid argument index"); + if (arg == NULL) { + _arg[i][0] = '\0'; + } else { + assert(strlen(arg) <= arg_length_max, "exceeds maximum argument length"); + strcpy(_arg[i], arg); + } + } + + // create an operation of a given name + AttachOperation(char* name) { + set_name(name); + for (int i=0; i<arg_count_max; i++) { + set_arg(i, NULL); + } + } + + // complete operation by sending result code and any result data to the client + virtual void complete(jint result, bufferedStream* result_stream) = 0; +}; +#endif // SERVICES_KERNEL