1 /*

     2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #ifndef SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_INLINE_HPP

    26 #define SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_INLINE_HPP

    27 

    28 #include "jfr/writers/jfrStreamWriterHost.hpp"

    29 #include "runtime/os.hpp"

    30 

    31 template <typename Adapter, typename AP>

    32 StreamWriterHost<Adapter, AP>::StreamWriterHost(typename Adapter::StorageType* storage, Thread* thread) :

    33   MemoryWriterHost<Adapter, AP>(storage, thread), _stream_pos(0), _fd(invalid_fd) {

    34 }

    35 

    36 template <typename Adapter, typename AP>

    37 StreamWriterHost<Adapter, AP>::StreamWriterHost(typename Adapter::StorageType* storage, size_t size) :

    38   MemoryWriterHost<Adapter, AP>(storage, size), _stream_pos(0), _fd(invalid_fd) {

    39 }

    40 

    41 template <typename Adapter, typename AP>

    42 StreamWriterHost<Adapter, AP>::StreamWriterHost(Thread* thread) :

    43   MemoryWriterHost<Adapter, AP>(thread), _stream_pos(0), _fd(invalid_fd) {

    44 }

    45 

    46 template <typename Adapter, typename AP>

    47 inline intptr_t StreamWriterHost<Adapter, AP>::current_stream_position() const {

    48   return this->used_offset() + _stream_pos;

    49 }

    50 

    51 template <typename Adapter, typename AP>

    52 inline bool StreamWriterHost<Adapter, AP>::accommodate(size_t used, size_t requested) {

    53   if (used > 0) {

    54     this->flush(used);

    55   }

    56   assert(this->used_size() == 0, "invariant");

    57   if (this->available_size() >= requested) {

    58     return true;

    59   }

    60   return StorageHost<Adapter, AP>::accommodate(0, requested);

    61 }

    62 

    63 template <typename Adapter, typename AP>

    64 inline void StreamWriterHost<Adapter, AP>::bytes(void* dest, const void* buf, size_t len) {

    65   if (len > this->available_size()) {

    66     this->write_unbuffered(buf, len);

    67     return;

    68   }

    69   MemoryWriterHost<Adapter, AP>::bytes(dest, buf, len);

    70 }

    71 

    72 template <typename Adapter, typename AP>

    73 inline void StreamWriterHost<Adapter, AP>::flush(size_t size) {

    74   assert(size > 0, "invariant");

    75   assert(this->is_valid(), "invariant");

    76   _stream_pos += os::write(_fd, this->start_pos(), (int)size);

    77   StorageHost<Adapter, AP>::reset();

    78   assert(0 == this->used_offset(), "invariant");

    79 }

    80 

    81 template <typename Adapter, typename AP>

    82 inline bool StreamWriterHost<Adapter, AP>::has_valid_fd() const {

    83   return invalid_fd != _fd;

    84 }

    85 

    86 template <typename Adapter, typename AP>

    87 inline intptr_t StreamWriterHost<Adapter, AP>::current_offset() const {

    88   return current_stream_position();

    89 }

    90 

    91 template <typename Adapter, typename AP>

    92 void StreamWriterHost<Adapter, AP>::seek(intptr_t offset) {

    93   this->flush();

    94   assert(0 == this->used_offset(), "can only seek from beginning");

    95   _stream_pos = os::seek_to_file_offset(_fd, offset);

    96 }

    97 

    98 template <typename Adapter, typename AP>

    99 void StreamWriterHost<Adapter, AP>::flush() {

   100   if (this->is_valid()) {

   101     const size_t used = this->used_size();

   102     if (used > 0) {

   103       this->flush(used);

   104     }

   105   }

   106 }

   107 

   108 template <typename Adapter, typename AP>

   109 void StreamWriterHost<Adapter, AP>::write_unbuffered(const void* buf, size_t len) {

   110   this->flush();

   111   assert(0 == this->used_offset(), "can only seek from beginning");

   112   while (len > 0) {

   113     const int n = MIN2<int>((int)len, INT_MAX);

   114     _stream_pos += os::write(_fd, buf, n);

   115     len -= n;

   116   }

   117 }

   118 

   119 template <typename Adapter, typename AP>

   120 inline bool StreamWriterHost<Adapter, AP>::is_valid() const {

   121   return has_valid_fd();

   122 }

   123 

   124 template <typename Adapter, typename AP>

   125 inline void StreamWriterHost<Adapter, AP>::close_fd() {

   126   assert(this->has_valid_fd(), "closing invalid fd!");

   127   os::close(_fd);

   128   _fd = invalid_fd;

   129 }

   130 

   131 template <typename Adapter, typename AP>

   132 inline void StreamWriterHost<Adapter, AP>::reset(fio_fd fd) {

   133   assert(!this->has_valid_fd(), "invariant");

   134   _fd = fd;

   135   _stream_pos = 0;

   136   this->hard_reset();

   137 }

   138 

   139 #endif // SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_INLINE_HPP