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Diffstat (limited to 'qpid/cpp/src/qpid/cluster/exp/BufferFactory.h')
-rw-r--r-- | qpid/cpp/src/qpid/cluster/exp/BufferFactory.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/exp/BufferFactory.h b/qpid/cpp/src/qpid/cluster/exp/BufferFactory.h new file mode 100644 index 0000000000..105b594d2d --- /dev/null +++ b/qpid/cpp/src/qpid/cluster/exp/BufferFactory.h @@ -0,0 +1,67 @@ +#ifndef QPID_CLUSTER_EXP_BUFFERFACTORY_H +#define QPID_CLUSTER_EXP_BUFFERFACTORY_H + +/* + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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. + * + */ +#include "qpid/BufferRef.h" +#include "qpid/RefCountedBuffer.h" +#include "qpid/sys/Mutex.h" +#include <algorithm> + +namespace qpid { +namespace cluster { + +/** + * Factory to allocate sub-buffers of RefCountedBuffers. + * Thread safe. + */ +class BufferFactory +{ + public: + /** @param min_size minimum size of underlying buffers. */ + inline BufferFactory(size_t min_size); + inline BufferRef get(size_t size); + private: + sys::Mutex lock; + size_t min_size; + BufferRef buf; + char* pos; +}; + +BufferFactory::BufferFactory(size_t size) : min_size(size) {} + +BufferRef BufferFactory::get(size_t size) { + sys::Mutex::ScopedLock l(lock); + if (!buf || pos + size > buf.end()) { + buf = RefCountedBuffer::create(std::max(size, min_size)); + pos = buf.begin(); + } + assert(buf); + assert(buf.begin() <= pos); + assert(pos + size <= buf.end()); + BufferRef ret(buf.sub_buffer(pos, pos+size)); + pos += size; + return ret; +} + +}} // namespace qpid::cluster + +#endif /*!QPID_CLUSTER_EXP_BUFFERFACTORY_H*/ |