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