2
* Copyright 2011 Google Inc.
4
* Licensed under the Apache License, Version 2.0 (the "License");
5
* you may not use this file except in compliance with the License.
6
* You may obtain a copy of the License at
8
* http://www.apache.org/licenses/LICENSE-2.0
10
* Unless required by applicable law or agreed to in writing, software
11
* distributed under the License is distributed on an "AS IS" BASIS,
12
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13
* See the License for the specific language governing permissions and
14
* limitations under the License.
17
// Author: morlovich@google.com (Maksim Orlovich)
19
#ifndef PAGESPEED_KERNEL_BASE_CHUNKING_WRITER_H_
20
#define PAGESPEED_KERNEL_BASE_CHUNKING_WRITER_H_
22
#include "pagespeed/kernel/base/basictypes.h"
23
#include "pagespeed/kernel/base/string_util.h"
24
#include "pagespeed/kernel/base/writer.h"
26
namespace net_instaweb {
30
// Wraps around an another writer forcing periodic flushes, and making sure
31
// writes are not too long.
32
class ChunkingWriter : public Writer {
34
// This writer will force a flush every flush_limit bytes.
35
// If the flush_limit is <= 0 no extra flushing will be performed.
36
// This does NOT take ownership of passed-in writer.
37
ChunkingWriter(Writer* writer, int flush_limit);
38
virtual ~ChunkingWriter();
40
virtual bool Write(const StringPiece& str, MessageHandler* handler);
41
virtual bool Flush(MessageHandler* handler);
44
// Flushes output if we have enough queued; returns false on Flush failure
45
bool FlushIfNeeded(MessageHandler* handler);
47
Writer* const writer_;
48
const int flush_limit_;
51
DISALLOW_COPY_AND_ASSIGN(ChunkingWriter);
54
} // namespace net_instaweb
56
#endif // PAGESPEED_KERNEL_BASE_CHUNKING_WRITER_H_