--- /dev/null	2019-01-28 17:47:35.000000000 +0800
+++ new/src/share/vm/jfr/recorder/repository/jfrRepository.cpp	2019-01-28 17:47:34.000000000 +0800
@@ -0,0 +1,480 @@
+/*
+ * Copyright (c) 2011, 2019, 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/jfr.hpp"
+#include "jfr/jni/jfrJavaSupport.hpp"
+#include "jfr/recorder/jfrRecorder.hpp"
+#include "jfr/recorder/repository/jfrChunkState.hpp"
+#include "jfr/recorder/repository/jfrChunkWriter.hpp"
+#include "jfr/recorder/repository/jfrRepository.hpp"
+#include "jfr/recorder/service/jfrPostBox.hpp"
+#include "jfr/utilities/jfrLog.hpp"
+#include "memory/resourceArea.hpp"
+#include "runtime/mutex.hpp"
+#include "runtime/os.hpp"
+#include "runtime/thread.inline.hpp"
+
+static JfrRepository* _instance = NULL;
+
+JfrRepository& JfrRepository::instance() {
+  return *_instance;
+}
+
+static JfrChunkWriter* _chunkwriter = NULL;
+
+static bool initialize_chunkwriter() {
+  assert(_chunkwriter == NULL, "invariant");
+  _chunkwriter = new JfrChunkWriter();
+  return _chunkwriter != NULL && _chunkwriter->initialize();
+}
+
+JfrChunkWriter& JfrRepository::chunkwriter() {
+  return *_chunkwriter;
+}
+
+JfrRepository::JfrRepository(JfrPostBox& post_box) : _path(NULL), _post_box(post_box) {}
+
+bool JfrRepository::initialize() {
+  return initialize_chunkwriter();
+}
+
+JfrRepository::~JfrRepository() {
+  if (_path != NULL) {
+    JfrCHeapObj::free(_path, strlen(_path) + 1);
+    _path = NULL;
+  }
+
+  if (_chunkwriter != NULL) {
+    delete _chunkwriter;
+    _chunkwriter = NULL;
+  }
+}
+
+JfrRepository* JfrRepository::create(JfrPostBox& post_box) {
+  assert(_instance == NULL, "invariant");
+  _instance = new JfrRepository(post_box);
+  return _instance;
+}
+
+void JfrRepository::destroy() {
+  assert(_instance != NULL, "invariant");
+  delete _instance;
+  _instance = NULL;
+}
+
+static const char vm_error_filename_fmt[] = "hs_err_pid%p.jfr";
+static const char vm_oom_filename_fmt[] = "hs_oom_pid%p.jfr";
+static const char vm_soe_filename_fmt[] = "hs_soe_pid%p.jfr";
+static const char chunk_file_jfr_ext[] = ".jfr";
+static const size_t iso8601_len = 19; // "YYYY-MM-DDTHH:MM:SS"
+
+static fio_fd open_exclusivly(const char* path) {
+  return os::open(path, O_CREAT | O_WRONLY, S_IREAD | S_IWRITE);
+}
+
+static fio_fd open_existing(const char* path) {
+  return os::open(path, O_RDWR, S_IREAD | S_IWRITE);
+}
+
+static int file_sort(const char** const file1, const char** file2) {
+  assert(NULL != *file1 && NULL != *file2, "invariant");
+  int cmp = strncmp(*file1, *file2, iso8601_len);
+  if (0 == cmp) {
+    const char* const dot1 = strchr(*file1, '.');
+    assert(NULL != dot1, "invariant");
+    const char* const dot2 = strchr(*file2, '.');
+    assert(NULL != dot2, "invariant");
+    ptrdiff_t file1_len = dot1 - *file1;
+    ptrdiff_t file2_len = dot2 - *file2;
+    if (file1_len < file2_len) {
+      return -1;
+    }
+    if (file1_len > file2_len) {
+      return 1;
+    }
+    assert(file1_len == file2_len, "invariant");
+    cmp = strncmp(*file1, *file2, file1_len);
+  }
+  assert(cmp != 0, "invariant");
+  return cmp;
+}
+
+static void iso8601_to_date_time(char* iso8601_str) {
+  assert(iso8601_str != NULL, "invariant");
+  assert(strlen(iso8601_str) == iso8601_len, "invariant");
+  // "YYYY-MM-DDTHH:MM:SS"
+  for (size_t i = 0; i < iso8601_len; ++i) {
+    switch(iso8601_str[i]) {
+      case 'T' :
+      case '-' :
+      case ':' :
+        iso8601_str[i] = '_';
+        break;
+    }
+  }
+  // "YYYY_MM_DD_HH_MM_SS"
+}
+
+static void date_time(char* buffer, size_t buffer_len) {
+  assert(buffer != NULL, "invariant");
+  assert(buffer_len >= iso8601_len, "buffer too small");
+  os::iso8601_time(buffer, buffer_len);
+  assert(strlen(buffer) >= iso8601_len + 1, "invariant");
+  // "YYYY-MM-DDTHH:MM:SS"
+  buffer[iso8601_len] = '\0';
+  iso8601_to_date_time(buffer);
+}
+
+static jlong file_size(fio_fd fd) {
+  assert(fd != invalid_fd, "invariant");
+  const jlong current_offset = os::current_file_offset(fd);
+  const jlong size = os::lseek(fd, 0, SEEK_END);
+  os::seek_to_file_offset(fd, current_offset);
+  return size;
+}
+
+class RepositoryIterator : public StackObj {
+ private:
+  const char* const _repo;
+  const size_t _repository_len;
+  GrowableArray<const char*>* _files;
+  const char* const fully_qualified(const char* entry) const;
+  mutable int _iterator;
+
+ public:
+   RepositoryIterator(const char* repository, size_t repository_len);
+   ~RepositoryIterator() {}
+  debug_only(void print_repository_files() const;)
+  const char* const filter(const char* entry) const;
+  bool has_next() const;
+  const char* const next() const;
+};
+
+const char* const RepositoryIterator::fully_qualified(const char* entry) const {
+  assert(NULL != entry, "invariant");
+  char* file_path_entry = NULL;
+   // only use files that have content, not placeholders
+  const char* const file_separator = os::file_separator();
+  if (NULL != file_separator) {
+    const size_t entry_len = strlen(entry);
+    const size_t file_separator_length = strlen(file_separator);
+    const size_t file_path_entry_length = _repository_len + file_separator_length + entry_len;
+    file_path_entry = NEW_RESOURCE_ARRAY_RETURN_NULL(char, file_path_entry_length + 1);
+    if (NULL == file_path_entry) {
+      return NULL;
+    }
+    int position = 0;
+    position += jio_snprintf(&file_path_entry[position], _repository_len + 1, "%s", _repo);
+    position += jio_snprintf(&file_path_entry[position], file_separator_length + 1, "%s", os::file_separator());
+    position += jio_snprintf(&file_path_entry[position], entry_len + 1, "%s", entry);
+    file_path_entry[position] = '\0';
+    assert((size_t)position == file_path_entry_length, "invariant");
+    assert(strlen(file_path_entry) == (size_t)position, "invariant");
+  }
+  return file_path_entry;
+}
+
+const char* const RepositoryIterator::filter(const char* entry) const {
+  if (entry == NULL) {
+    return NULL;
+  }
+  const size_t entry_len = strlen(entry);
+  if (entry_len <= 2) {
+    // for "." and ".."
+    return NULL;
+  }
+  char* entry_name = NEW_RESOURCE_ARRAY_RETURN_NULL(char, entry_len + 1);
+  if (entry_name == NULL) {
+    return NULL;
+  }
+  strncpy(entry_name, entry, entry_len);
+  entry_name[entry_len] = '\0';
+  const char* const fully_qualified_path_entry = fully_qualified(entry_name);
+  if (NULL == fully_qualified_path_entry) {
+    return NULL;
+  }
+  const fio_fd entry_fd = open_existing(fully_qualified_path_entry);
+  if (invalid_fd == entry_fd) {
+    return NULL;
+  }
+  const jlong entry_size = file_size(entry_fd);
+  os::close(entry_fd);
+  if (0 == entry_size) {
+    return NULL;
+  }
+  return entry_name;
+}
+
+RepositoryIterator::RepositoryIterator(const char* repository, size_t repository_len) :
+  _repo(repository),
+  _repository_len(repository_len),
+  _files(NULL),
+  _iterator(0) {
+  if (NULL != _repo) {
+    assert(strlen(_repo) == _repository_len, "invariant");
+    _files = new GrowableArray<const char*>(10);
+    DIR* dirp = os::opendir(_repo);
+    if (dirp == NULL) {
+      log_error(jfr, system)("Unable to open repository %s", _repo);
+      return;
+    }
+    struct dirent* dentry;
+    char* dir_buffer = NEW_RESOURCE_ARRAY_RETURN_NULL(char, os::readdir_buf_size(_repo));
+    if (dir_buffer == NULL) {
+      return;
+    }
+    while ((dentry = os::readdir(dirp, (struct dirent*)dir_buffer)) != NULL) {
+      const char* const entry_path = filter(dentry->d_name);
+      if (NULL != entry_path) {
+        _files->append(entry_path);
+      }
+    }
+    os::closedir(dirp);
+    if (_files->length() > 1) {
+      _files->sort(file_sort);
+    }
+  }
+}
+
+#ifdef ASSERT
+void RepositoryIterator::print_repository_files() const {
+  while (has_next()) {
+    log_error(jfr, system)( "%s", next());
+  }
+}
+#endif
+bool RepositoryIterator::has_next() const {
+  return (_files != NULL && _iterator < _files->length());
+}
+
+const char* const RepositoryIterator::next() const {
+  return _iterator >= _files->length() ? NULL : fully_qualified(_files->at(_iterator++));
+}
+
+static void write_emergency_file(fio_fd emergency_fd, const RepositoryIterator& iterator) {
+  assert(emergency_fd != invalid_fd, "invariant");
+  const size_t size_of_file_copy_block = 1 * M; // 1 mb
+  jbyte* const file_copy_block = NEW_RESOURCE_ARRAY_RETURN_NULL(jbyte, size_of_file_copy_block);
+  if (file_copy_block == NULL) {
+    return;
+  }
+ jlong bytes_written_total = 0;
+  while (iterator.has_next()) {
+    fio_fd current_fd = invalid_fd;
+    const char* const fqn = iterator.next();
+    if (fqn != NULL) {
+      current_fd = open_existing(fqn);
+      if (current_fd != invalid_fd) {
+        const jlong current_filesize = file_size(current_fd);
+        assert(current_filesize > 0, "invariant");
+        jlong bytes_read = 0;
+        jlong bytes_written = 0;
+        while (bytes_read < current_filesize) {
+          bytes_read += (jlong)os::read_at(current_fd, file_copy_block, size_of_file_copy_block, bytes_read);
+          assert(bytes_read - bytes_written <= (jlong)size_of_file_copy_block, "invariant");
+          bytes_written += (jlong)os::write(emergency_fd, file_copy_block, bytes_read - bytes_written);
+          assert(bytes_read == bytes_written, "invariant");
+        }
+        os::close(current_fd);
+        bytes_written_total += bytes_written;
+      }
+    }
+  }
+}
+
+static const char* create_emergency_dump_path() {
+  assert(JfrStream_lock->owned_by_self(), "invariant");
+  char* buffer = NEW_RESOURCE_ARRAY_RETURN_NULL(char, O_BUFLEN);
+  if (NULL == buffer) {
+    return NULL;
+  }
+  const char* const cwd = os::get_current_directory(buffer, O_BUFLEN);
+  if (NULL == cwd) {
+    return NULL;
+  }
+  size_t pos = strlen(cwd);
+  const int fsep_len = jio_snprintf(&buffer[pos], O_BUFLEN - pos, "%s", os::file_separator());
+  const char* filename_fmt = NULL;
+  // fetch specific error cause
+  switch (JfrJavaSupport::cause()) {
+    case JfrJavaSupport::OUT_OF_MEMORY:
+      filename_fmt = vm_oom_filename_fmt;
+      break;
+    case JfrJavaSupport::STACK_OVERFLOW:
+      filename_fmt = vm_soe_filename_fmt;
+      break;
+    default:
+      filename_fmt = vm_error_filename_fmt;
+  }
+  char* emergency_dump_path = NULL;
+  pos += fsep_len;
+  if (Arguments::copy_expand_pid(filename_fmt, strlen(filename_fmt), &buffer[pos], O_BUFLEN - pos)) {
+    const size_t emergency_filename_length = strlen(buffer);
+    emergency_dump_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, emergency_filename_length + 1);
+    if (NULL == emergency_dump_path) {
+      return NULL;
+    }
+    strncpy(emergency_dump_path, buffer, emergency_filename_length);
+    emergency_dump_path[emergency_filename_length] = '\0';
+  }
+  return emergency_dump_path;
+}
+
+// Caller needs ResourceMark
+static const char* create_emergency_chunk_path(const char* repository_base, size_t repository_len) {
+  assert(repository_base != NULL, "invariant");
+  assert(JfrStream_lock->owned_by_self(), "invariant");
+  // date time
+  char date_time_buffer[32] = {0};
+  date_time(date_time_buffer, sizeof(date_time_buffer));
+  size_t date_time_len = strlen(date_time_buffer);
+  size_t chunkname_max_len = repository_len               // repository_base
+                             + 1                          // "/"
+                             + date_time_len              // date_time
+                             + strlen(chunk_file_jfr_ext) // .jfr
+                             + 1;
+  char* chunk_path = NEW_RESOURCE_ARRAY_RETURN_NULL(char, chunkname_max_len);
+  if (chunk_path == NULL) {
+    return NULL;
+  }
+  // append the individual substrings
+  jio_snprintf(chunk_path, chunkname_max_len, "%s%s%s%s", repository_base, os::file_separator(), date_time_buffer, chunk_file_jfr_ext);
+  return chunk_path;
+}
+
+static fio_fd emergency_dump_file() {
+  assert(JfrStream_lock->owned_by_self(), "invariant");
+  ResourceMark rm;
+  const char* const emergency_dump_path = create_emergency_dump_path();
+  if (emergency_dump_path == NULL) {
+    return invalid_fd;
+  }
+  const fio_fd fd = open_exclusivly(emergency_dump_path);
+  if (fd != invalid_fd) {
+    log_info(jfr)( // For user, should not be "jfr, system"
+      "Attempting to recover JFR data, emergency jfr file: %s", emergency_dump_path);
+  }
+  return fd;
+}
+
+static const char* emergency_path(const char* repository, size_t repository_len) {
+  return repository == NULL ? create_emergency_dump_path() : create_emergency_chunk_path(repository, repository_len);
+}
+
+void JfrRepository::on_vm_error() {
+  assert(!JfrStream_lock->owned_by_self(), "invariant");
+  const char* path = _path;
+  if (path == NULL) {
+    // completed already
+    return;
+  }
+  ResourceMark rm;
+  MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
+  const fio_fd emergency_fd = emergency_dump_file();
+  if (emergency_fd != invalid_fd) {
+    RepositoryIterator iterator(path, strlen(path));
+    write_emergency_file(emergency_fd, iterator);
+    os::close(emergency_fd);
+  }
+}
+
+bool JfrRepository::set_path(const char* path) {
+  assert(path != NULL, "trying to set the repository path with a NULL string!");
+  if (_path != NULL) {
+    // delete existing
+    JfrCHeapObj::free(_path, strlen(_path) + 1);
+  }
+  const size_t path_len = strlen(path);
+  _path = JfrCHeapObj::new_array<char>(path_len + 1);
+  if (_path == NULL) {
+    return false;
+  }
+  strncpy(_path, path, path_len);
+  _path[path_len] = '\0';
+  return true;
+}
+
+void JfrRepository::set_chunk_path(const char* path) {
+  assert(JfrStream_lock->owned_by_self(), "invariant");
+  chunkwriter().set_chunk_path(path);
+}
+
+void JfrRepository::notify_on_new_chunk_path() {
+  if (Jfr::is_recording()) {
+    instance()._post_box.post(MSG_ROTATE);
+  }
+}
+
+/**
+* Sets the file where data should be written.
+*
+* Recording  Previous  Current  Action
+* ==============================================
+*   true     null      null     Ignore, keep recording in-memory
+*   true     null      file1    Start disk recording
+*   true     file      null     Copy out metadata to disk and continue in-memory recording
+*   true     file1     file2    Copy out metadata and start with new File (file2)
+*   false     *        null     Ignore, but start recording to memory
+*   false     *        file     Ignore, but start recording to disk
+*/
+void JfrRepository::set_chunk_path(jstring path, JavaThread* jt) {
+  DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt));
+  ResourceMark rm(jt);
+  const char* const canonical_chunk_path = JfrJavaSupport::c_str(path, jt);
+  {
+    MutexLockerEx stream_lock(JfrStream_lock, Mutex::_no_safepoint_check_flag);
+    if (NULL == canonical_chunk_path && !_chunkwriter->is_valid()) {
+      // new output is NULL and current output is NULL
+      return;
+    }
+    instance().set_chunk_path(canonical_chunk_path);
+  }
+  notify_on_new_chunk_path();
+}
+
+void JfrRepository::set_path(jstring location, JavaThread* jt) {
+  DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt));
+  ResourceMark rm(jt);
+  const char* const path = JfrJavaSupport::c_str(location, jt);
+  if (path != NULL) {
+    instance().set_path(path);
+  }
+}
+
+bool JfrRepository::open_chunk(bool vm_error /* false */) {
+  assert(JfrStream_lock->owned_by_self(), "invariant");
+  if (vm_error) {
+    ResourceMark rm;
+    const char* repository_path = _path;
+    const size_t repository_path_len = repository_path != NULL ? strlen(repository_path) : 0;
+    const char* const path = emergency_path(repository_path, repository_path_len);
+    _chunkwriter->set_chunk_path(path);
+  }
+  return _chunkwriter->open();
+}
+
+size_t JfrRepository::close_chunk(jlong metadata_offset) {
+  return _chunkwriter->close(metadata_offset);
+}