alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (diagnosticFramework.cpp)

This example Java source code file (diagnosticFramework.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

check, cmdline, dcmdfactory, gendcmdargument, growablearray, has_pending_exception, mutex\:\:_no_safepoint_check_flag, mutexlockerex, null, thread, throw_msg, throw_msg_null, traps, unknown

The diagnosticFramework.cpp Java example source code

/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "precompiled.hpp"
#include "memory/oopFactory.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/mutexLocker.hpp"
#include "services/diagnosticArgument.hpp"
#include "services/diagnosticFramework.hpp"
#include "services/management.hpp"

CmdLine::CmdLine(const char* line, size_t len, bool no_command_name) {
  assert(line != NULL, "Command line string should not be NULL");
  const char* line_end;
  const char* cmd_end;

  _cmd = line;
  line_end = &line[len];

  // Skip whitespace in the beginning of the line.
  while (_cmd < line_end && isspace((int) _cmd[0])) {
    _cmd++;
  }
  cmd_end = _cmd;

  if (no_command_name) {
    _cmd = NULL;
    _cmd_len = 0;
  } else {
    // Look for end of the command name
    while (cmd_end < line_end && !isspace((int) cmd_end[0])) {
      cmd_end++;
    }
    _cmd_len = cmd_end - _cmd;
  }
  _args = cmd_end;
  _args_len = line_end - _args;
}

bool DCmdArgIter::next(TRAPS) {
  if (_len == 0) return false;
  // skipping spaces
  while (_cursor < _len - 1 && _buffer[_cursor] == _delim) {
    _cursor++;
  }
  // handling end of command line
  if (_cursor >= _len - 1) {
    _cursor = _len - 1;
    _key_addr = &_buffer[_len - 1];
    _key_len = 0;
    _value_addr = &_buffer[_len - 1];
    _value_len = 0;
    return false;
  }
  // extracting first item, argument or option name
  _key_addr = &_buffer[_cursor];
  bool arg_had_quotes = false;
  while (_cursor <= _len - 1 && _buffer[_cursor] != '=' && _buffer[_cursor] != _delim) {
    // argument can be surrounded by single or double quotes
    if (_buffer[_cursor] == '\"' || _buffer[_cursor] == '\'') {
      _key_addr++;
      char quote = _buffer[_cursor];
      arg_had_quotes = true;
      while (_cursor < _len - 1) {
        _cursor++;
        if (_buffer[_cursor] == quote && _buffer[_cursor - 1] != '\\') {
          break;
        }
      }
      if (_buffer[_cursor] != quote) {
        THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
                "Format error in diagnostic command arguments", false);
      }
      break;
    }
    _cursor++;
  }
  _key_len = &_buffer[_cursor] - _key_addr;
  if (arg_had_quotes) {
    // if the argument was quoted, we need to step past the last quote here
    _cursor++;
  }
  // check if the argument has the <key>= format
  if (_cursor <= _len -1 && _buffer[_cursor] == '=') {
    _cursor++;
    _value_addr = &_buffer[_cursor];
    bool value_had_quotes = false;
    // extract the value
    while (_cursor <= _len - 1 && _buffer[_cursor] != _delim) {
      // value can be surrounded by simple or double quotes
      if (_buffer[_cursor] == '\"' || _buffer[_cursor] == '\'') {
        _value_addr++;
        char quote = _buffer[_cursor];
        value_had_quotes = true;
        while (_cursor < _len - 1) {
          _cursor++;
          if (_buffer[_cursor] == quote && _buffer[_cursor - 1] != '\\') {
            break;
          }
        }
        if (_buffer[_cursor] != quote) {
          THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
                  "Format error in diagnostic command arguments", false);
        }
        break;
      }
      _cursor++;
    }
    _value_len = &_buffer[_cursor] - _value_addr;
    if (value_had_quotes) {
      // if the value was quoted, we need to step past the last quote here
      _cursor++;
    }
  } else {
    _value_addr = NULL;
    _value_len = 0;
  }
  return _key_len != 0;
}

bool DCmdInfo::by_name(void* cmd_name, DCmdInfo* info) {
  if (info == NULL) return false;
  return strcmp((const char*)cmd_name, info->name()) == 0;
}

void DCmdParser::add_dcmd_option(GenDCmdArgument* arg) {
  assert(arg != NULL, "Sanity");
  if (_options == NULL) {
    _options = arg;
  } else {
    GenDCmdArgument* o = _options;
    while (o->next() != NULL) {
      o = o->next();
    }
    o->set_next(arg);
  }
  arg->set_next(NULL);
  Thread* THREAD = Thread::current();
  arg->init_value(THREAD);
  if (HAS_PENDING_EXCEPTION) {
    fatal("Initialization must be successful");
  }
}

void DCmdParser::add_dcmd_argument(GenDCmdArgument* arg) {
  assert(arg != NULL, "Sanity");
  if (_arguments_list == NULL) {
    _arguments_list = arg;
  } else {
    GenDCmdArgument* a = _arguments_list;
    while (a->next() != NULL) {
      a = a->next();
    }
    a->set_next(arg);
  }
  arg->set_next(NULL);
  Thread* THREAD = Thread::current();
  arg->init_value(THREAD);
  if (HAS_PENDING_EXCEPTION) {
    fatal("Initialization must be successful");
  }
}

void DCmdParser::parse(CmdLine* line, char delim, TRAPS) {
  GenDCmdArgument* next_argument = _arguments_list;
  DCmdArgIter iter(line->args_addr(), line->args_len(), delim);
  bool cont = iter.next(CHECK);
  while (cont) {
    GenDCmdArgument* arg = lookup_dcmd_option(iter.key_addr(),
            iter.key_length());
    if (arg != NULL) {
      arg->read_value(iter.value_addr(), iter.value_length(), CHECK);
    } else {
      if (next_argument != NULL) {
        arg = next_argument;
        arg->read_value(iter.key_addr(), iter.key_length(), CHECK);
        next_argument = next_argument->next();
      } else {
        const size_t buflen    = 120;
        const size_t argbuflen = 30;
        char buf[buflen];
        char argbuf[argbuflen];
        size_t len = MIN2<size_t>(iter.key_length(), argbuflen - 1);

        strncpy(argbuf, iter.key_addr(), len);
        argbuf[len] = '\0';
        jio_snprintf(buf, buflen - 1, "Unknown argument '%s' in diagnostic command.", argbuf);

        THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), buf);
      }
    }
    cont = iter.next(CHECK);
  }
  check(CHECK);
}

GenDCmdArgument* DCmdParser::lookup_dcmd_option(const char* name, size_t len) {
  GenDCmdArgument* arg = _options;
  while (arg != NULL) {
    if (strlen(arg->name()) == len &&
      strncmp(name, arg->name(), len) == 0) {
      return arg;
    }
    arg = arg->next();
  }
  return NULL;
}

void DCmdParser::check(TRAPS) {
  const size_t buflen = 256;
  char buf[buflen];
  GenDCmdArgument* arg = _arguments_list;
  while (arg != NULL) {
    if (arg->is_mandatory() && !arg->has_value()) {
      jio_snprintf(buf, buflen - 1, "The argument '%s' is mandatory.", arg->name());
      THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), buf);
    }
    arg = arg->next();
  }
  arg = _options;
  while (arg != NULL) {
    if (arg->is_mandatory() && !arg->has_value()) {
      jio_snprintf(buf, buflen - 1, "The option '%s' is mandatory.", arg->name());
      THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), buf);
    }
    arg = arg->next();
  }
}

void DCmdParser::print_help(outputStream* out, const char* cmd_name) {
  out->print("Syntax : %s %s", cmd_name, _options == NULL ? "" : "[options]");
  GenDCmdArgument* arg = _arguments_list;
  while (arg != NULL) {
    if (arg->is_mandatory()) {
      out->print(" <%s>", arg->name());
    } else {
      out->print(" [<%s>]", arg->name());
    }
    arg = arg->next();
  }
  out->print_cr("");
  if (_arguments_list != NULL) {
    out->print_cr("\nArguments:");
    arg = _arguments_list;
    while (arg != NULL) {
      out->print("\t%s : %s %s (%s, ", arg->name(),
                 arg->is_mandatory() ? "" : "[optional]",
                 arg->description(), arg->type());
      if (arg->has_default()) {
        out->print(arg->default_string());
      } else {
        out->print("no default value");
      }
      out->print_cr(")");
      arg = arg->next();
    }
  }
  if (_options != NULL) {
    out->print_cr("\nOptions: (options must be specified using the <key> or = syntax)");
    arg = _options;
    while (arg != NULL) {
      out->print("\t%s : %s %s (%s, ", arg->name(),
                 arg->is_mandatory() ? "" : "[optional]",
                 arg->description(), arg->type());
      if (arg->has_default()) {
        out->print(arg->default_string());
      } else {
        out->print("no default value");
      }
      out->print_cr(")");
      arg = arg->next();
    }
  }
}

void DCmdParser::reset(TRAPS) {
  GenDCmdArgument* arg = _arguments_list;
  while (arg != NULL) {
    arg->reset(CHECK);
    arg = arg->next();
  }
  arg = _options;
  while (arg != NULL) {
    arg->reset(CHECK);
    arg = arg->next();
  }
}

void DCmdParser::cleanup() {
  GenDCmdArgument* arg = _arguments_list;
  while (arg != NULL) {
    arg->cleanup();
    arg = arg->next();
  }
  arg = _options;
  while (arg != NULL) {
    arg->cleanup();
    arg = arg->next();
  }
}

int DCmdParser::num_arguments() {
  GenDCmdArgument* arg = _arguments_list;
  int count = 0;
  while (arg != NULL) {
    count++;
    arg = arg->next();
  }
  arg = _options;
  while (arg != NULL) {
    count++;
    arg = arg->next();
  }
  return count;
}

GrowableArray<const char *>* DCmdParser::argument_name_array() {
  int count = num_arguments();
  GrowableArray<const char *>* array = new GrowableArray(count);
  GenDCmdArgument* arg = _arguments_list;
  while (arg != NULL) {
    array->append(arg->name());
    arg = arg->next();
  }
  arg = _options;
  while (arg != NULL) {
    array->append(arg->name());
    arg = arg->next();
  }
  return array;
}

GrowableArray<DCmdArgumentInfo*>* DCmdParser::argument_info_array() {
  int count = num_arguments();
  GrowableArray<DCmdArgumentInfo*>* array = new GrowableArray(count);
  int idx = 0;
  GenDCmdArgument* arg = _arguments_list;
  while (arg != NULL) {
    array->append(new DCmdArgumentInfo(arg->name(), arg->description(),
                  arg->type(), arg->default_string(), arg->is_mandatory(),
                  false, arg->allow_multiple(), idx));
    idx++;
    arg = arg->next();
  }
  arg = _options;
  while (arg != NULL) {
    array->append(new DCmdArgumentInfo(arg->name(), arg->description(),
                  arg->type(), arg->default_string(), arg->is_mandatory(),
                  true, arg->allow_multiple()));
    arg = arg->next();
  }
  return array;
}

DCmdFactory* DCmdFactory::_DCmdFactoryList = NULL;
bool DCmdFactory::_has_pending_jmx_notification = false;

void DCmd::parse_and_execute(DCmdSource source, outputStream* out,
                             const char* cmdline, char delim, TRAPS) {

  if (cmdline == NULL) return; // Nothing to do!
  DCmdIter iter(cmdline, '\n');

  int count = 0;
  while (iter.has_next()) {
    if(source == DCmd_Source_MBean && count > 0) {
      // When diagnostic commands are invoked via JMX, each command line
      // must contains one and only one command because of the Permission
      // checks performed by the DiagnosticCommandMBean
      THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
              "Invalid syntax");
    }
    CmdLine line = iter.next();
    if (line.is_stop()) {
      break;
    }
    if (line.is_executable()) {
      DCmd* command = DCmdFactory::create_local_DCmd(source, line, out, CHECK);
      assert(command != NULL, "command error must be handled before this line");
      DCmdMark mark(command);
      command->parse(&line, delim, CHECK);
      command->execute(source, CHECK);
    }
    count++;
  }
}

void DCmdWithParser::parse(CmdLine* line, char delim, TRAPS) {
  _dcmdparser.parse(line, delim, CHECK);
}

void DCmdWithParser::print_help(const char* name) {
  _dcmdparser.print_help(output(), name);
}

void DCmdWithParser::reset(TRAPS) {
  _dcmdparser.reset(CHECK);
}

void DCmdWithParser::cleanup() {
  _dcmdparser.cleanup();
}

GrowableArray<const char*>* DCmdWithParser::argument_name_array() {
  return _dcmdparser.argument_name_array();
}

GrowableArray<DCmdArgumentInfo*>* DCmdWithParser::argument_info_array() {
  return _dcmdparser.argument_info_array();
}

void DCmdFactory::push_jmx_notification_request() {
  MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
  _has_pending_jmx_notification = true;
  Service_lock->notify_all();
}

void DCmdFactory::send_notification(TRAPS) {
  DCmdFactory::send_notification_internal(THREAD);
  // Clearing pending exception to avoid premature termination of
  // the service thread
  if (HAS_PENDING_EXCEPTION) {
    CLEAR_PENDING_EXCEPTION;
  }
}
void DCmdFactory::send_notification_internal(TRAPS) {
  ResourceMark rm(THREAD);
  HandleMark hm(THREAD);
  bool notif = false;
  {
    MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
    notif = _has_pending_jmx_notification;
    _has_pending_jmx_notification = false;
  }
  if (notif) {

    Klass* k = Management::sun_management_ManagementFactoryHelper_klass(CHECK);
    instanceKlassHandle mgmt_factory_helper_klass(THREAD, k);

    JavaValue result(T_OBJECT);
    JavaCalls::call_static(&result,
            mgmt_factory_helper_klass,
            vmSymbols::getDiagnosticCommandMBean_name(),
            vmSymbols::getDiagnosticCommandMBean_signature(),
            CHECK);

    instanceOop m = (instanceOop) result.get_jobject();
    instanceHandle dcmd_mbean_h(THREAD, m);

    Klass* k2 = Management::sun_management_DiagnosticCommandImpl_klass(CHECK);
    instanceKlassHandle dcmd_mbean_klass(THREAD, k2);

    if (!dcmd_mbean_h->is_a(k2)) {
      THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
              "ManagementFactory.getDiagnosticCommandMBean didn't return a DiagnosticCommandMBean instance");
    }

    JavaValue result2(T_VOID);
    JavaCallArguments args2(dcmd_mbean_h);

    JavaCalls::call_virtual(&result2,
            dcmd_mbean_klass,
            vmSymbols::createDiagnosticFrameworkNotification_name(),
            vmSymbols::void_method_signature(),
            &args2,
            CHECK);
  }
}

Mutex* DCmdFactory::_dcmdFactory_lock = new Mutex(Mutex::leaf, "DCmdFactory", true);
bool DCmdFactory::_send_jmx_notification = false;

DCmdFactory* DCmdFactory::factory(DCmdSource source, const char* name, size_t len) {
  MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
  DCmdFactory* factory = _DCmdFactoryList;
  while (factory != NULL) {
    if (strlen(factory->name()) == len &&
        strncmp(name, factory->name(), len) == 0) {
      if(factory->export_flags() & source) {
        return factory;
      } else {
        return NULL;
      }
    }
    factory = factory->_next;
  }
  return NULL;
}

int DCmdFactory::register_DCmdFactory(DCmdFactory* factory) {
  MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
  factory->_next = _DCmdFactoryList;
  _DCmdFactoryList = factory;
  if (_send_jmx_notification && !factory->_hidden
      && (factory->_export_flags & DCmd_Source_MBean)) {
    DCmdFactory::push_jmx_notification_request();
  }
  return 0; // Actually, there's no checks for duplicates
}

DCmd* DCmdFactory::create_global_DCmd(DCmdSource source, CmdLine &line,
                                      outputStream* out, TRAPS) {
  DCmdFactory* f = factory(source, line.cmd_addr(), line.cmd_len());
  if (f != NULL) {
    if (f->is_enabled()) {
      THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
                     f->disabled_message());
    }
    return f->create_Cheap_instance(out);
  }
  THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
             "Unknown diagnostic command");
}

DCmd* DCmdFactory::create_local_DCmd(DCmdSource source, CmdLine &line,
                                     outputStream* out, TRAPS) {
  DCmdFactory* f = factory(source, line.cmd_addr(), line.cmd_len());
  if (f != NULL) {
    if (!f->is_enabled()) {
      THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
                     f->disabled_message());
    }
    return f->create_resource_instance(out);
  }
  THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
             "Unknown diagnostic command");
}

GrowableArray<const char*>* DCmdFactory::DCmd_list(DCmdSource source) {
  MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
  GrowableArray<const char*>* array = new GrowableArray();
  DCmdFactory* factory = _DCmdFactoryList;
  while (factory != NULL) {
    if (!factory->is_hidden() && (factory->export_flags() & source)) {
      array->append(factory->name());
    }
    factory = factory->next();
  }
  return array;
}

GrowableArray<DCmdInfo*>* DCmdFactory::DCmdInfo_list(DCmdSource source ) {
  MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
  GrowableArray<DCmdInfo*>* array = new GrowableArray();
  DCmdFactory* factory = _DCmdFactoryList;
  while (factory != NULL) {
    if (!factory->is_hidden() && (factory->export_flags() & source)) {
      array->append(new DCmdInfo(factory->name(),
                    factory->description(), factory->impact(),
                    factory->permission(), factory->num_arguments(),
                    factory->is_enabled()));
    }
    factory = factory->next();
  }
  return array;
}

Other Java examples (source code examples)

Here is a short list of links related to this Java diagnosticFramework.cpp source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.