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Java example source code file (perfData.cpp)

This example Java source code file (perfData.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

mutexlocker, null, perfdata\:\:units, perfdatalist, perfdatamanager\:\:create_long_counter, perfdatamanager\:\:create_long_variable, perflongcounter, perflongvariable, perfstringconstant, perfstringvariable, throw_0, traps, useperfdata, variability

The perfData.cpp Java example source code

/*
 * Copyright (c) 2001, 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 "classfile/vmSymbols.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/mutex.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/os.hpp"
#include "runtime/perfData.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/globalDefinitions.hpp"

PerfDataList*   PerfDataManager::_all = NULL;
PerfDataList*   PerfDataManager::_sampled = NULL;
PerfDataList*   PerfDataManager::_constants = NULL;

/*
 * The jvmstat global and subsysem jvmstat counter name spaces. The top
 * level name spaces imply the interface stability level of the counter,
 * which generally follows the Java package, class, and property naming
 * conventions. The CounterNS enumeration values should be used to index
 * into this array.
 */
const char* PerfDataManager::_name_spaces[] = {
  // top level name spaces
  "java",                   // stable and supported name space
  "com.sun",                // unstable but supported name space
  "sun",                    // unstable and unsupported name space
  // subsystem name spaces
  "java.gc",                // Garbage Collection name spaces
  "com.sun.gc",
  "sun.gc",
  "java.ci",                // Compiler name spaces
  "com.sun.ci",
  "sun.ci",
  "java.cls",               // Class Loader name spaces
  "com.sun.cls",
  "sun.cls",
  "java.rt",                // Runtime name spaces
  "com.sun.rt",
  "sun.rt",
  "java.os",                // Operating System name spaces
  "com.sun.os",
  "sun.os",
  "java.threads",           // Threads System name spaces
  "com.sun.threads",
  "sun.threads",
  "java.property",          // Java Property name spaces
  "com.sun.property",
  "sun.property",
  "",
};

PerfData::PerfData(CounterNS ns, const char* name, Units u, Variability v)
                  : _name(NULL), _u(u), _v(v), _valuep(NULL),
                    _on_c_heap(false) {

  const char* prefix = PerfDataManager::ns_to_string(ns);

  _name = NEW_C_HEAP_ARRAY(char, strlen(name) + strlen(prefix) + 2, mtInternal);
  assert(_name != NULL && strlen(name) != 0, "invalid name");

  if (ns == NULL_NS) {
     // No prefix is added to counters with the NULL_NS namespace.
     strcpy(_name, name);
     // set the F_Supported flag based on the counter name prefix.
     if (PerfDataManager::is_stable_supported(_name) ||
         PerfDataManager::is_unstable_supported(_name)) {
       _flags = F_Supported;
     }
     else {
       _flags = F_None;
     }
  }
  else {
    sprintf(_name, "%s.%s", prefix, name);
    // set the F_Supported flag based on the given namespace.
    if (PerfDataManager::is_stable_supported(ns) ||
        PerfDataManager::is_unstable_supported(ns)) {
      _flags = F_Supported;
    }
    else {
      _flags = F_None;
    }
  }
}

PerfData::~PerfData() {
  if (_name != NULL) {
    FREE_C_HEAP_ARRAY(char, _name, mtInternal);
  }
  if (is_on_c_heap()) {
    FREE_C_HEAP_ARRAY(PerfDataEntry, _pdep, mtInternal);
  }
}

void PerfData::create_entry(BasicType dtype, size_t dsize, size_t vlen) {

  size_t dlen = vlen==0 ? 1 : vlen;

  size_t namelen = strlen(name()) + 1;  // include null terminator
  size_t size = sizeof(PerfDataEntry) + namelen;
  size_t pad_length = ((size % dsize) == 0) ? 0 : dsize - (size % dsize);
  size += pad_length;
  size_t data_start = size;
  size += (dsize * dlen);

  // align size to assure allocation in units of 8 bytes
  int align = sizeof(jlong) - 1;
  size = ((size + align) & ~align);
  char* psmp = PerfMemory::alloc(size);

  if (psmp == NULL) {
    // out of PerfMemory memory resources. allocate on the C heap
    // to avoid vm termination.
    psmp = NEW_C_HEAP_ARRAY(char, size, mtInternal);
    _on_c_heap = true;
  }

  // compute the addresses for the name and data
  char* cname = psmp + sizeof(PerfDataEntry);

  // data is in the last dsize*dlen bytes of the entry
  void* valuep = (void*) (psmp + data_start);

  assert(is_on_c_heap() || PerfMemory::contains(cname), "just checking");
  assert(is_on_c_heap() || PerfMemory::contains((char*)valuep), "just checking");

  // copy the name, including null terminator, into PerfData memory
  strcpy(cname, name());


  // set the header values in PerfData memory
  PerfDataEntry* pdep = (PerfDataEntry*)psmp;
  pdep->entry_length = (jint)size;
  pdep->name_offset = (jint) ((uintptr_t) cname - (uintptr_t) psmp);
  pdep->vector_length = (jint)vlen;
  pdep->data_type = (jbyte) type2char(dtype);
  pdep->data_units = units();
  pdep->data_variability = variability();
  pdep->flags = (jbyte)flags();
  pdep->data_offset = (jint) data_start;

  if (PerfTraceDataCreation) {
    tty->print("name = %s, dtype = %d, variability = %d,"
               " units = %d, dsize = %d, vlen = %d,"
               " pad_length = %d, size = %d, on_c_heap = %s,"
               " address = " INTPTR_FORMAT ","
               " data address = " INTPTR_FORMAT "\n",
               cname, dtype, variability(),
               units(), dsize, vlen,
               pad_length, size, is_on_c_heap() ? "TRUE":"FALSE",
               psmp, valuep);
  }

  // record the start of the entry and the location of the data field.
  _pdep = pdep;
  _valuep = valuep;

  // mark the PerfData memory region as having been updated.
  PerfMemory::mark_updated();
}

PerfLong::PerfLong(CounterNS ns, const char* namep, Units u, Variability v)
                 : PerfData(ns, namep, u, v) {

  create_entry(T_LONG, sizeof(jlong));
}

int PerfLong::format(char* buffer, int length) {
  return jio_snprintf(buffer, length, JLONG_FORMAT, *(jlong*)_valuep);
}

PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
                                 Variability v, jlong* sampled)
                                : PerfLong(ns, namep, u, v),
                                  _sampled(sampled), _sample_helper(NULL) {

  sample();
}

PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
                                 Variability v, PerfLongSampleHelper* helper)
                                : PerfLong(ns, namep, u, v),
                                  _sampled(NULL), _sample_helper(helper) {

  sample();
}

void PerfLongVariant::sample() {

  // JJJ - This should not happen.  Maybe the first sample is taken
  // while the _sample_helper is being null'ed out.
  // assert(_sample_helper != NULL || _sampled != NULL, "unexpected state");
  if (_sample_helper == NULL) return;

  if (_sample_helper != NULL) {
    *(jlong*)_valuep = _sample_helper->take_sample();
  }
  else if (_sampled != NULL) {
    *(jlong*)_valuep = *_sampled;
  }
}

PerfByteArray::PerfByteArray(CounterNS ns, const char* namep, Units u,
                             Variability v, jint length)
                            : PerfData(ns, namep, u, v), _length(length) {

  create_entry(T_BYTE, sizeof(jbyte), (size_t)_length);
}

void PerfString::set_string(const char* s2) {

  // copy n bytes of the string, assuring the null string is
  // copied if s2 == NULL.
  strncpy((char *)_valuep, s2 == NULL ? "" : s2, _length);

  // assure the string is null terminated when strlen(s2) >= _length
  ((char*)_valuep)[_length-1] = '\0';
}

int PerfString::format(char* buffer, int length) {
  return jio_snprintf(buffer, length, "%s", (char*)_valuep);
}

PerfStringConstant::PerfStringConstant(CounterNS ns, const char* namep,
                                       const char* initial_value)
                     : PerfString(ns, namep, V_Constant,
                                  initial_value == NULL ? 1 :
                                  MIN2((jint)(strlen((char*)initial_value)+1),
                                       (jint)(PerfMaxStringConstLength+1)),
                                  initial_value) {

  if (PrintMiscellaneous && Verbose) {
    if (is_valid() && initial_value != NULL &&
        ((jint)strlen(initial_value) > (jint)PerfMaxStringConstLength)) {

      warning("Truncating PerfStringConstant: name = %s,"
              " length = " INT32_FORMAT ","
              " PerfMaxStringConstLength = " INT32_FORMAT "\n",
              namep,
              (jint)strlen(initial_value),
              (jint)PerfMaxStringConstLength);
    }
  }
}






void PerfDataManager::destroy() {

  if (_all == NULL)
    // destroy already called, or initialization never happened
    return;

  for (int index = 0; index < _all->length(); index++) {
    PerfData* p = _all->at(index);
    delete p;
  }

  delete(_all);
  delete(_sampled);
  delete(_constants);

  _all = NULL;
  _sampled = NULL;
  _constants = NULL;
}

void PerfDataManager::add_item(PerfData* p, bool sampled) {

  MutexLocker ml(PerfDataManager_lock);

  if (_all == NULL) {
    _all = new PerfDataList(100);
  }

  assert(!_all->contains(p->name()), "duplicate name added");

  // add to the list of all perf data items
  _all->append(p);

  if (p->variability() == PerfData::V_Constant) {
    if (_constants == NULL) {
      _constants = new PerfDataList(25);
    }
    _constants->append(p);
    return;
  }

  if (sampled) {
    if (_sampled == NULL) {
      _sampled = new PerfDataList(25);
    }
    _sampled->append(p);
  }
}

PerfData* PerfDataManager::find_by_name(const char* name) {
  return _all->find_by_name(name);
}

PerfDataList* PerfDataManager::all() {

  MutexLocker ml(PerfDataManager_lock);

  if (_all == NULL)
    return NULL;

  PerfDataList* clone = _all->clone();
  return clone;
}

PerfDataList* PerfDataManager::sampled() {

  MutexLocker ml(PerfDataManager_lock);

  if (_sampled == NULL)
    return NULL;

  PerfDataList* clone = _sampled->clone();
  return clone;
}

PerfDataList* PerfDataManager::constants() {

  MutexLocker ml(PerfDataManager_lock);

  if (_constants == NULL)
    return NULL;

  PerfDataList* clone = _constants->clone();
  return clone;
}

char* PerfDataManager::counter_name(const char* ns, const char* name) {
   assert(ns != NULL, "ns string required");
   assert(name != NULL, "name string required");

   size_t len = strlen(ns) + strlen(name) + 2;
   char* result = NEW_RESOURCE_ARRAY(char, len);
   sprintf(result, "%s.%s", ns, name);
   return result;
}

char* PerfDataManager::name_space(const char* ns, const char* sub,
                                  int instance) {
   char intbuf[40];
   jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
   return name_space(ns, name_space(sub, intbuf));
}

char *PerfDataManager::name_space(const char* ns, int instance) {
   char intbuf[40];
   jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
   return name_space(ns, intbuf);
}

PerfStringConstant* PerfDataManager::create_string_constant(CounterNS ns,
                                                            const char* name,
                                                            const char* s,
                                                            TRAPS) {

  PerfStringConstant* p = new PerfStringConstant(ns, name, s);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, false);

  return p;
}

PerfLongConstant* PerfDataManager::create_long_constant(CounterNS ns,
                                                        const char* name,
                                                        PerfData::Units u,
                                                        jlong val, TRAPS) {

  PerfLongConstant* p = new PerfLongConstant(ns, name, u, val);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, false);

  return p;
}

PerfStringVariable* PerfDataManager::create_string_variable(CounterNS ns,
                                                            const char* name,
                                                            jint max_length,
                                                            const char* s,
                                                            TRAPS) {

  if (max_length == 0 && s != NULL) max_length = (jint)strlen(s);

  assert(max_length != 0, "PerfStringVariable with length 0");

  PerfStringVariable* p = new PerfStringVariable(ns, name, max_length, s);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, false);

  return p;
}

PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
                                                        const char* name,
                                                        PerfData::Units u,
                                                        jlong ival, TRAPS) {

  PerfLongVariable* p = new PerfLongVariable(ns, name, u, ival);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, false);

  return p;
}

PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
                                                        const char* name,
                                                        PerfData::Units u,
                                                        jlong* sp, TRAPS) {

  // Sampled counters not supported if UsePerfData is false
  if (!UsePerfData) return NULL;

  PerfLongVariable* p = new PerfLongVariable(ns, name, u, sp);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, true);

  return p;
}

PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
                                                        const char* name,
                                                        PerfData::Units u,
                                                        PerfSampleHelper* sh,
                                                        TRAPS) {

  // Sampled counters not supported if UsePerfData is false
  if (!UsePerfData) return NULL;

  PerfLongVariable* p = new PerfLongVariable(ns, name, u, sh);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, true);

  return p;
}

PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
                                                      const char* name,
                                                      PerfData::Units u,
                                                      jlong ival, TRAPS) {

  PerfLongCounter* p = new PerfLongCounter(ns, name, u, ival);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, false);

  return p;
}

PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
                                                      const char* name,
                                                      PerfData::Units u,
                                                      jlong* sp, TRAPS) {

  // Sampled counters not supported if UsePerfData is false
  if (!UsePerfData) return NULL;

  PerfLongCounter* p = new PerfLongCounter(ns, name, u, sp);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, true);

  return p;
}

PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
                                                      const char* name,
                                                      PerfData::Units u,
                                                      PerfSampleHelper* sh,
                                                      TRAPS) {

  // Sampled counters not supported if UsePerfData is false
  if (!UsePerfData) return NULL;

  PerfLongCounter* p = new PerfLongCounter(ns, name, u, sh);

  if (!p->is_valid()) {
    // allocation of native resources failed.
    delete p;
    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
  }

  add_item(p, true);

  return p;
}

PerfDataList::PerfDataList(int length) {

  _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(length, true);
}

PerfDataList::PerfDataList(PerfDataList* p) {

  _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(p->length(), true);

  _set->appendAll(p->get_impl());
}

PerfDataList::~PerfDataList() {

  delete _set;

}

bool PerfDataList::by_name(void* name, PerfData* pd) {

  if (pd == NULL)
    return false;

  return strcmp((const char*)name, pd->name()) == 0;
}

PerfData* PerfDataList::find_by_name(const char* name) {

  // if add_item hasn't been called the list won't be initialized
  if (this == NULL)
    return NULL;

  int i = _set->find((void*)name, PerfDataList::by_name);

  if (i >= 0 && i <= _set->length())
    return _set->at(i);
  else
    return NULL;
}

PerfDataList* PerfDataList::clone() {

  PerfDataList* copy = new PerfDataList(this);

  assert(copy != NULL, "just checking");

  return copy;
}

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