/*

 * Copyright (c) 2016, 2018, 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 "jfr/jni/jfrJavaSupport.hpp"

#include "jfr/utilities/jfrJavaLog.hpp"

#include "jfr/utilities/jfrLogTagSets.hpp"

#include "logging/log.hpp"

#include "logging/logConfiguration.hpp"

#include "memory/resourceArea.hpp"

#include "runtime/thread.inline.hpp"

#define JFR_LOG_TAGS_CONCATED(T0, T1, T2, T3, T4, T5, ...)  \

  T0 ## _ ## T1 ## _ ## T2 ## _ ## T3 ## _ ## T4 ## _ ## T5

enum JfrLogTagSetType {

#define JFR_LOG_TAG(...) \

    EXPAND_VARARGS(JFR_LOG_TAGS_CONCATED(__VA_ARGS__, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG)),

    JFR_LOG_TAG_SET_LIST

#undef JFR_LOG_TAG

    JFR_LOG_TAG_SET_COUNT

};

struct jfrLogSubscriber

{

  jobject log_tag_enum_ref;

  LogTagSet* log_tag_set;

};

static jfrLogSubscriber log_tag_sets[JFR_LOG_TAG_SET_COUNT];

static void log_cfg_update(LogLevelType llt, JfrLogTagSetType jflt, TRAPS) {

  DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));

  if (log_tag_sets[jflt].log_tag_enum_ref == NULL) {

    return;

  }

  jobject lt = log_tag_sets[jflt].log_tag_enum_ref;

  // set field tagSetLevel to llt value

  JavaValue result(T_VOID);

  JfrJavaArguments args(&result);

  args.set_klass(JfrJavaSupport::klass(lt));

  args.set_name("tagSetLevel", CHECK);

  args.set_signature("I", CHECK);

  args.set_receiver(JfrJavaSupport::resolve_non_null(lt));

  args.push_int(llt);

  JfrJavaSupport::set_field(&args, THREAD);

}

static LogLevelType highest_level(const LogTagSet& lts) {

  for (size_t i = 0; i < LogLevel::Count; i++) {

    if (lts.is_level((LogLevelType)i)) {

      return (LogLevelType)i;

    }

  }

  return LogLevel::Off;

}

static void log_config_change_internal(bool init, TRAPS) {

  LogLevelType llt;

  LogTagSet* lts;

#define JFR_LOG_TAG(...) \

  lts = &LogTagSetMapping<LOG_TAGS(__VA_ARGS__)>::tagset(); \

  if (init) { \

    JfrLogTagSetType tagSetType = \

      EXPAND_VARARGS(JFR_LOG_TAGS_CONCATED(__VA_ARGS__, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG)); \

    assert(NULL == log_tag_sets[tagSetType].log_tag_set, "Init JFR LogTagSets twice"); \

    log_tag_sets[tagSetType].log_tag_set = lts; \

  } \

  llt = highest_level(*lts); \

  log_cfg_update(llt, \

  EXPAND_VARARGS(JFR_LOG_TAGS_CONCATED(__VA_ARGS__, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG, _NO_TAG)), THREAD);

  JFR_LOG_TAG_SET_LIST

#undef JFR_LOG_TAG

}

static void log_config_change() {

  Thread* t = Thread::current();

  DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(t));

  log_config_change_internal(false, t);

}

void JfrJavaLog::subscribe_log_level(jobject log_tag, jint id, TRAPS) {

  DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));

  static bool subscribed_updates = true;

  assert(id < JFR_LOG_TAG_SET_COUNT,

    "LogTag id, java and native not in synch, %d < %d", id, JFR_LOG_TAG_SET_COUNT);

  assert(NULL == log_tag_sets[id].log_tag_enum_ref, "Subscribing twice");

  log_tag_sets[id].log_tag_enum_ref = JfrJavaSupport::global_jni_handle(log_tag, THREAD);

  if (subscribed_updates) {

    LogConfiguration::register_update_listener(&log_config_change);

    log_config_change_internal(true, THREAD);

    subscribed_updates = false;

  } else {

    log_config_change_internal(false, THREAD);

  }

}

void JfrJavaLog::log(jint tag_set, jint level, jstring message, TRAPS) {

  DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));

  if (message == NULL) {

    return;

  }

  if (level < (jint)LogLevel::First || level > (jint)LogLevel::Last) {

    JfrJavaSupport::throw_illegal_argument_exception("LogLevel passed is outside valid range", THREAD);

    return;

  }

  if (tag_set < 0 || tag_set >= (jint)JFR_LOG_TAG_SET_COUNT) {

    JfrJavaSupport::throw_illegal_argument_exception("LogTagSet id is outside valid range", THREAD);

    return;

  }

  ResourceMark rm(THREAD);

  const char* const s = JfrJavaSupport::c_str(message, CHECK);

  assert(s != NULL, "invariant");

  assert(log_tag_sets[tag_set].log_tag_set != NULL, "LogTagSet is not init");

  log_tag_sets[tag_set].log_tag_set->log((LogLevelType)level, s);

}