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Diffstat (limited to 'qpid/cpp/src/qpid/cluster/PollableQueue.h')
-rw-r--r-- | qpid/cpp/src/qpid/cluster/PollableQueue.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/PollableQueue.h b/qpid/cpp/src/qpid/cluster/PollableQueue.h new file mode 100644 index 0000000000..10e2ed6ac3 --- /dev/null +++ b/qpid/cpp/src/qpid/cluster/PollableQueue.h @@ -0,0 +1,89 @@ +#ifndef QPID_CLUSTER_POLLABLEQUEUE_H +#define QPID_CLUSTER_POLLABLEQUEUE_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/sys/PollableQueue.h" +#include <qpid/log/Statement.h> + +namespace qpid { +namespace cluster { + +/** + * More convenient version of PollableQueue that handles iterating + * over the batch and error handling. + * + * Constructed in "bypass" mode where items are processed directly + * rather than put on the queue. This is important for the + * PRE_INIT stage when Cluster is pumping CPG dispatch directly + * before the poller has started. + * + * Calling start() starts the pollable queue and disabled bypass mode. + */ +template <class T> class PollableQueue : public sys::PollableQueue<T> { + public: + typedef boost::function<void (const T&)> Callback; + typedef boost::function<void()> ErrorCallback; + + PollableQueue(Callback f, ErrorCallback err, const std::string& msg, + const boost::shared_ptr<sys::Poller>& poller) + : sys::PollableQueue<T>(boost::bind(&PollableQueue<T>::handleBatch, this, _1), + poller), + callback(f), error(err), message(msg), bypass(true) + {} + + typename sys::PollableQueue<T>::Batch::const_iterator + handleBatch(const typename sys::PollableQueue<T>::Batch& values) { + try { + typename sys::PollableQueue<T>::Batch::const_iterator i = values.begin(); + while (i != values.end() && !this->isStopped()) { + callback(*i); + ++i; + } + return i; + } + catch (const std::exception& e) { + QPID_LOG(critical, message << ": " << e.what()); + this->stop(); + error(); + return values.end(); + } + } + + void push(const T& t) { + if (bypass) callback(t); + else sys::PollableQueue<T>::push(t); + } + + void bypassOff() { bypass = false; } + + private: + Callback callback; + ErrorCallback error; + std::string message; + bool bypass; +}; + + +}} // namespace qpid::cluster + +#endif /*!QPID_CLUSTER_POLLABLEQUEUE_H*/ |