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src/share/vm/services/attachListener.hpp@f42c10a3d4b1 (annotated)

src/share/vm/services/attachListener.hpp

Mon, 31 Mar 2014 13:09:35 -0700

author

minqi

date

Mon, 31 Mar 2014 13:09:35 -0700

changeset 6535

f42c10a3d4b1

parent 5412

2e8f19c2feef

child 6876

710a3c8b516e

child 9313

fd0ca2c1433b

permissions

-rw-r--r--

7090324: gclog rotation via external tool
Summary: GC log rotation can be set via java command line, but customer sometime need to sync with OS level rotation setting.
Reviewed-by: sla, minqi, ehelin
Contributed-by: suenaga.yasumasa@lab.ntt.co.jp

duke@435	1	/*
zgu@4492	2	* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_SERVICES_ATTACHLISTENER_HPP
stefank@2314	26	#define SHARE_VM_SERVICES_ATTACHLISTENER_HPP
stefank@2314	27
stefank@2314	28	#include "memory/allocation.hpp"
stefank@2314	29	#include "utilities/debug.hpp"
stefank@2314	30	#include "utilities/ostream.hpp"
jprovino@4542	31	#include "utilities/macros.hpp"
stefank@2314	32
duke@435	33	// The AttachListener thread services a queue of operations that are enqueued
duke@435	34	// by client tools. Each operation is identified by a name and has up to 3
duke@435	35	// arguments. The operation name is mapped to a function which performs the
duke@435	36	// operation. The function is called with an outputStream which is can use to
duke@435	37	// write any result data (for examples the properties command serializes
duke@435	38	// properties names and values to the output stream). When the function
duke@435	39	// complets the result value and any result data is returned to the client
duke@435	40	// tool.
duke@435	41
duke@435	42	class AttachOperation;
duke@435	43
duke@435	44	typedef jint (*AttachOperationFunction)(AttachOperation* op, outputStream* out);
duke@435	45
duke@435	46	struct AttachOperationFunctionInfo {
duke@435	47	const char* name;
duke@435	48	AttachOperationFunction func;
duke@435	49	};
duke@435	50
duke@435	51	class AttachListener: AllStatic {
duke@435	52	public:
allwin@5412	53	static void vm_start() NOT_SERVICES_RETURN;
jprovino@4165	54	static void init() NOT_SERVICES_RETURN;
jprovino@4165	55	static void abort() NOT_SERVICES_RETURN;
duke@435	56
duke@435	57	// invoke to perform clean-up tasks when all clients detach
jprovino@4165	58	static void detachall() NOT_SERVICES_RETURN;
duke@435	59
duke@435	60	// indicates if the Attach Listener needs to be created at startup
jprovino@4165	61	static bool init_at_startup() NOT_SERVICES_RETURN_(false);
duke@435	62
duke@435	63	// indicates if we have a trigger to start the Attach Listener
jprovino@4165	64	static bool is_init_trigger() NOT_SERVICES_RETURN_(false);
duke@435	65
jprovino@4165	66	#if !INCLUDE_SERVICES
duke@435	67	static bool is_attach_supported() { return false; }
jprovino@4165	68	#else
duke@435	69	private:
duke@435	70	static volatile bool _initialized;
duke@435	71
duke@435	72	public:
duke@435	73	static bool is_initialized() { return _initialized; }
duke@435	74	static void set_initialized() { _initialized = true; }
duke@435	75
duke@435	76	// indicates if this VM supports attach-on-demand
duke@435	77	static bool is_attach_supported() { return !DisableAttachMechanism; }
duke@435	78
duke@435	79	// platform specific initialization
duke@435	80	static int pd_init();
duke@435	81
duke@435	82	// platform specific operation
duke@435	83	static AttachOperationFunctionInfo* pd_find_operation(const char* name);
duke@435	84
duke@435	85	// platform specific flag change
duke@435	86	static jint pd_set_flag(AttachOperation* op, outputStream* out);
duke@435	87
duke@435	88	// platform specific detachall
duke@435	89	static void pd_detachall();
duke@435	90
duke@435	91	// platform specific data dump
duke@435	92	static void pd_data_dump();
duke@435	93
duke@435	94	// dequeue the next operation
duke@435	95	static AttachOperation* dequeue();
jprovino@4165	96	#endif // !INCLUDE_SERVICES
duke@435	97	};
duke@435	98
jprovino@4165	99	#if INCLUDE_SERVICES
zgu@3900	100	class AttachOperation: public CHeapObj<mtInternal> {
duke@435	101	public:
duke@435	102	enum {
duke@435	103	name_length_max = 16, // maximum length of name
duke@435	104	arg_length_max = 1024, // maximum length of argument
duke@435	105	arg_count_max = 3 // maximum number of arguments
duke@435	106	};
duke@435	107
duke@435	108	// name of special operation that can be enqueued when all
duke@435	109	// clients detach
duke@435	110	static char* detachall_operation_name() { return (char*)"detachall"; }
duke@435	111
duke@435	112	private:
duke@435	113	char _name[name_length_max+1];
duke@435	114	char _arg[arg_count_max][arg_length_max+1];
duke@435	115
duke@435	116	public:
duke@435	117	const char* name() const { return _name; }
duke@435	118
duke@435	119	// set the operation name
duke@435	120	void set_name(char* name) {
duke@435	121	assert(strlen(name) <= name_length_max, "exceeds maximum name length");
duke@435	122	strcpy(_name, name);
duke@435	123	}
duke@435	124
duke@435	125	// get an argument value
duke@435	126	const char* arg(int i) const {
duke@435	127	assert(i>=0 && i<arg_count_max, "invalid argument index");
duke@435	128	return _arg[i];
duke@435	129	}
duke@435	130
duke@435	131	// set an argument value
duke@435	132	void set_arg(int i, char* arg) {
duke@435	133	assert(i>=0 && i<arg_count_max, "invalid argument index");
duke@435	134	if (arg == NULL) {
duke@435	135	_arg[i][0] = '\0';
duke@435	136	} else {
duke@435	137	assert(strlen(arg) <= arg_length_max, "exceeds maximum argument length");
duke@435	138	strcpy(_arg[i], arg);
duke@435	139	}
duke@435	140	}
duke@435	141
duke@435	142	// create an operation of a given name
duke@435	143	AttachOperation(char* name) {
duke@435	144	set_name(name);
duke@435	145	for (int i=0; i<arg_count_max; i++) {
duke@435	146	set_arg(i, NULL);
duke@435	147	}
duke@435	148	}
duke@435	149
duke@435	150	// complete operation by sending result code and any result data to the client
duke@435	151	virtual void complete(jint result, bufferedStream* result_stream) = 0;
duke@435	152	};
jprovino@4165	153	#endif // INCLUDE_SERVICES
stefank@2314	154
stefank@2314	155	#endif // SHARE_VM_SERVICES_ATTACHLISTENER_HPP