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Diffstat (limited to 'qpid/cpp/src/qpid/cluster/ErrorCheck.cpp')
| -rw-r--r-- | qpid/cpp/src/qpid/cluster/ErrorCheck.cpp | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/ErrorCheck.cpp b/qpid/cpp/src/qpid/cluster/ErrorCheck.cpp new file mode 100644 index 0000000000..be671c0f48 --- /dev/null +++ b/qpid/cpp/src/qpid/cluster/ErrorCheck.cpp @@ -0,0 +1,155 @@ +/* + * + * 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/ErrorCheck.h" +#include "qpid/cluster/EventFrame.h" +#include "qpid/cluster/ClusterMap.h" +#include "qpid/cluster/Cluster.h" +#include "qpid/framing/ClusterErrorCheckBody.h" +#include "qpid/framing/ClusterConfigChangeBody.h" +#include "qpid/log/Statement.h" + +#include <algorithm> + +namespace qpid { +namespace cluster { + +using namespace std; +using namespace framing; +using namespace framing::cluster; + +ErrorCheck::ErrorCheck(Cluster& c) + : cluster(c), mcast(c.getMulticast()), frameSeq(0), type(ERROR_TYPE_NONE), connection(0) +{} + +void ErrorCheck::error( + Connection& c, ErrorType t, framing::SequenceNumber seq, const MemberSet& ms, + const std::string& msg) +{ + // Detected a local error, inform cluster and set error state. + assert(t != ERROR_TYPE_NONE); // Must be an error. + assert(type == ERROR_TYPE_NONE); // Can't be called when already in an error state. + type = t; + unresolved = ms; + frameSeq = seq; + connection = &c; + message = msg; + QPID_LOG(debug, cluster<< (type == ERROR_TYPE_SESSION ? " channel" : " connection") + << " error " << frameSeq << " on " << c + << " must be resolved with: " << unresolved + << ": " << message); + mcast.mcastControl( + ClusterErrorCheckBody(ProtocolVersion(), type, frameSeq), cluster.getId()); + // If there are already frames queued up by a previous error, review + // them with respect to this new error. + for (FrameQueue::iterator i = frames.begin(); i != frames.end(); i = review(i)) + ; +} + +void ErrorCheck::delivered(const EventFrame& e) { + frames.push_back(e); + review(frames.end()-1); +} + +// Review a frame in the queue with respect to the current error. +ErrorCheck::FrameQueue::iterator ErrorCheck::review(const FrameQueue::iterator& i) { + FrameQueue::iterator next = i+1; + if(!isUnresolved() || !i->frame.getBody() || !i->frame.getMethod()) + return next; // Only interested in control frames while unresolved. + const AMQMethodBody* method = i->frame.getMethod(); + if (method->isA<const ClusterErrorCheckBody>()) { + const ClusterErrorCheckBody* errorCheck = + static_cast<const ClusterErrorCheckBody*>(method); + + if (errorCheck->getFrameSeq() == frameSeq) { // Addresses current error + next = frames.erase(i); // Drop matching error check controls + if (errorCheck->getType() < type) { // my error is worse than his + QPID_LOG(critical, cluster + << " local error " << frameSeq << " did not occur on member " + << i->getMemberId() + << ": " << message); + throw Exception( + QPID_MSG("local error did not occur on all cluster members " << ": " << message)); + } + else { // his error is worse/same as mine. + QPID_LOG(debug, cluster << " error " << frameSeq + << " resolved with " << i->getMemberId()); + unresolved.erase(i->getMemberId()); + checkResolved(); + } + } + else if (errorCheck->getFrameSeq() < frameSeq && errorCheck->getType() != NONE + && i->connectionId.getMember() != cluster.getId()) + { + // This error occured before the current error so we + // have processed past it. + next = frames.erase(i); // Drop the error check control + respondNone(i->connectionId.getMember(), errorCheck->getType(), + errorCheck->getFrameSeq()); + } + // if errorCheck->getFrameSeq() > frameSeq then leave it in the queue. + } + else if (method->isA<const ClusterConfigChangeBody>()) { + const ClusterConfigChangeBody* configChange = + static_cast<const ClusterConfigChangeBody*>(method); + if (configChange) { + MemberSet members(decodeMemberSet(configChange->getMembers())); + QPID_LOG(debug, cluster << " apply config change to error " + << frameSeq << ": " << members); + MemberSet intersect; + set_intersection(members.begin(), members.end(), + unresolved.begin(), unresolved.end(), + inserter(intersect, intersect.begin())); + unresolved.swap(intersect); + checkResolved(); + } + } + return next; +} + +void ErrorCheck::checkResolved() { + if (unresolved.empty()) { // No more potentially conflicted members, we're clear. + type = ERROR_TYPE_NONE; + QPID_LOG(debug, cluster << " error " << frameSeq << " resolved."); + } + else + QPID_LOG(debug, cluster << " error " << frameSeq + << " must be resolved with " << unresolved); +} + +EventFrame ErrorCheck::getNext() { + assert(canProcess()); + EventFrame e(frames.front()); + frames.pop_front(); + return e; +} + +void ErrorCheck::respondNone(const MemberId& from, uint8_t type, framing::SequenceNumber frameSeq) { + // Don't respond to non-errors or to my own errors. + if (type == ERROR_TYPE_NONE || from == cluster.getId()) + return; + QPID_LOG(debug, cluster << " error " << frameSeq << " did not occur locally."); + mcast.mcastControl( + ClusterErrorCheckBody(ProtocolVersion(), ERROR_TYPE_NONE, frameSeq), + cluster.getId() + ); +} + +}} // namespace qpid::cluster |