| /* |
| * |
| * 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 |