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Diffstat (limited to 'qpid/cpp/src/qpid/cluster/OutputInterceptor.cpp')
-rw-r--r-- | qpid/cpp/src/qpid/cluster/OutputInterceptor.cpp | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/OutputInterceptor.cpp b/qpid/cpp/src/qpid/cluster/OutputInterceptor.cpp new file mode 100644 index 0000000000..4bf03eefa2 --- /dev/null +++ b/qpid/cpp/src/qpid/cluster/OutputInterceptor.cpp @@ -0,0 +1,125 @@ +/* + * + * 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/cluster/OutputInterceptor.h" +#include "qpid/cluster/Connection.h" +#include "qpid/cluster/Cluster.h" +#include "qpid/framing/ClusterConnectionDeliverDoOutputBody.h" +#include "qpid/framing/AMQFrame.h" +#include "qpid/log/Statement.h" +#include <boost/current_function.hpp> + + +namespace qpid { +namespace cluster { + +using namespace framing; +using namespace std; + +NoOpConnectionOutputHandler OutputInterceptor::discardHandler; + +OutputInterceptor::OutputInterceptor(Connection& p, sys::ConnectionOutputHandler& h) + : parent(p), closing(false), next(&h), sendMax(2048), sent(0), sentDoOutput(false) +{} + +void OutputInterceptor::send(framing::AMQFrame& f) { + sys::Mutex::ScopedLock l(lock); + next->send(f); +} + +void OutputInterceptor::activateOutput() { + sys::Mutex::ScopedLock l(lock); + if (parent.isCatchUp()) + next->activateOutput(); + else + sendDoOutput(sendMax, l); +} + +void OutputInterceptor::abort() { + sys::Mutex::ScopedLock l(lock); + if (parent.isLocal()) { + next->abort(); + } +} + +void OutputInterceptor::giveReadCredit(int32_t credit) { + sys::Mutex::ScopedLock l(lock); + next->giveReadCredit(credit); +} + +// Called in write thread when the IO layer has no more data to write. +// We only process IO callbacks in the write thread during catch-up. +// Normally we run doOutput only on delivery of doOutput requests. +bool OutputInterceptor::doOutput() { + parent.doCatchupIoCallbacks(); + return false; +} + +// Send output up to limit, calculate new limit. +void OutputInterceptor::deliverDoOutput(uint32_t limit) { + sys::Mutex::ScopedLock l(lock); + sentDoOutput = false; + sendMax = limit; + size_t newLimit = limit; + if (parent.isLocal()) { + size_t buffered = next->getBuffered(); + if (buffered == 0 && sent == sendMax) // Could have sent more, increase the limit. + newLimit = sendMax*2; + else if (buffered > 0 && sent > 1) // Data left unsent, reduce the limit. + newLimit = (sendMax + sent) / 2; + } + sent = 0; + while (sent < limit) { + { + sys::Mutex::ScopedUnlock u(lock); + if (!parent.getBrokerConnection()->doOutput()) break; + } + ++sent; + } + if (sent == limit) sendDoOutput(newLimit, l); +} + +void OutputInterceptor::sendDoOutput(size_t newLimit, const sys::Mutex::ScopedLock&) { + if (parent.isLocal() && !sentDoOutput && !closing) { + sentDoOutput = true; + parent.getCluster().getMulticast().mcastControl( + ClusterConnectionDeliverDoOutputBody(ProtocolVersion(), newLimit), + parent.getId()); + } +} + +// Called in connection thread when local connection closes. +void OutputInterceptor::closeOutput() { + sys::Mutex::ScopedLock l(lock); + closing = true; + next = &discardHandler; +} + +void OutputInterceptor::close() { + sys::Mutex::ScopedLock l(lock); + next->close(); +} + +size_t OutputInterceptor::getBuffered() const { + sys::Mutex::ScopedLock l(lock); + return next->getBuffered(); +} + +}} // namespace qpid::cluster |