/********************************************************************* * Software License Agreement (BSD License) * * Copyright (c) 2017, Bielefeld University * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of Bielefeld University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. *********************************************************************/ /* Authors: Robert Haschke */ #include #include #include #include #include #include #include #include #include #include #include using namespace std::placeholders; namespace moveit { namespace task_constructor { ContainerBasePrivate::ContainerBasePrivate(ContainerBase* me, const std::string& name) : StagePrivate(me, name) , required_interface_(UNKNOWN) , pending_backward_(new Interface) , pending_forward_(new Interface) {} ContainerBasePrivate::const_iterator ContainerBasePrivate::childByIndex(int index, bool for_insert) const { if (!for_insert && index < 0) --index; const_iterator position = children_.begin(); if (index > 0) { for (auto end = children_.end(); index > 0 && position != end; --index) ++position; } else if (++index <= 0) { container_type::const_reverse_iterator from_end = children_.rbegin(); for (auto end = children_.rend(); index < 0 && from_end != end; ++index) ++from_end; position = index < 0 ? children_.end() : from_end.base(); } return position; } bool ContainerBasePrivate::traverseStages(const ContainerBase::StageCallback& processor, unsigned int cur_depth, unsigned int max_depth) const { if (cur_depth >= max_depth) return true; for (auto& stage : children_) { if (!processor(*stage, cur_depth)) return false; const ContainerBasePrivate* container = dynamic_cast(stage->pimpl()); if (container) container->traverseStages(processor, cur_depth + 1, max_depth); } return true; } void ContainerBasePrivate::validateConnectivity() const { // recursively validate all children and accumulate errors for (const auto& child : children()) child->pimpl()->validateConnectivity(); } bool ContainerBasePrivate::canCompute() const { // call the method of the public interface return static_cast(me_)->canCompute(); } void ContainerBasePrivate::compute() { // call the method of the public interface static_cast(me_)->compute(); } void ContainerBasePrivate::onNewFailure(const Stage& child, const InterfaceState* from, const InterfaceState* to) { switch (child.pimpl()->interfaceFlags()) { case GENERATE: // just ignore: the pair of (new) states isn't known to us anyway // TODO: If child is a container, from and to might have associated solutions already! break; case PROPAGATE_FORWARDS: // mark from as failed (backwards) setStatus(from, InterfaceState::Status::FAILED); break; case PROPAGATE_BACKWARDS: // mark to as failed (forwards) setStatus(to, InterfaceState::Status::FAILED); break; case CONNECT: if (const Connecting* conn = dynamic_cast(&child)) { auto cimpl = conn->pimpl(); ROS_DEBUG_STREAM_NAMED("Connecting", "'" << child.name() << "' generated a failure"); if (!cimpl->hasPendingOpposites(from)) { ROS_DEBUG_STREAM_NAMED("Connecting", "prune backward branch"); setStatus(from, InterfaceState::Status::FAILED); } if (!cimpl->hasPendingOpposites(to)) { ROS_DEBUG_STREAM_NAMED("Connecting", "prune forward branch"); setStatus(to, InterfaceState::Status::FAILED); } } break; } // printChildrenInterfaces(*this, false, child); } template void ContainerBasePrivate::setStatus(const InterfaceState* s, InterfaceState::Status status) { if (s->priority().status() == status) return; // nothing changing // if we should disable the state, only do so when there is no enabled alternative path if (status == InterfaceState::PRUNED) { auto solution_is_enabled = [](auto&& solution) { return state()>(*solution)->priority().enabled(); }; const auto& alternatives = trajectories()>(*s); auto alternative_path = std::find_if(alternatives.cbegin(), alternatives.cend(), solution_is_enabled); if (alternative_path != alternatives.cend()) return; } // actually enable/disable the state if (s->owner()) { s->owner()->updatePriority(const_cast(s), InterfaceState::Priority(s->priority(), status)); } else { const_cast(s)->priority_ = InterfaceState::Priority(s->priority(), status); } // if possible (i.e. if state s has an external counterpart), escalate setStatus to external interface if (parent() && trajectories(*s).empty()) { auto external{ internalToExternalMap().find(s) }; if (external != internalToExternalMap().end()) { // do we have an external state? // only escalate if there is no other *enabled* internal state connected to the same external one // all internal states linked to external auto internals{ externalToInternalMap().equal_range(external->get()) }; auto is_enabled = [](const auto& ext_int_pair) { return ext_int_pair.second->priority().enabled(); }; auto other_path{ std::find_if(internals.first, internals.second, is_enabled) }; if (other_path == internals.second) parent()->pimpl()->setStatus(external->get(), status); return; } } // To break symmetry between both ends of a partial solution sequence that gets disabled, // we mark the first state with FAILED and all other states down the tree only with PRUNED. // This allows us to re-enable the FAILED side, while not (yet) consider the PRUNED states again, // when new states arrive in a Connecting stage. // All PRUNED states are only re-enabled if the FAILED state actually gets connected. // For details, see: https://github.com/ros-planning/moveit_task_constructor/pull/221 if (status == InterfaceState::Status::FAILED) status = InterfaceState::Status::PRUNED; // only the first state is marked as FAILED // traverse solution tree for (const SolutionBase* successor : trajectories(*s)) setStatus(state(*successor), status); } void ContainerBasePrivate::setStatus(Interface::Direction dir, const InterfaceState* s, InterfaceState::Status status) { if (dir == Interface::FORWARD) setStatus(s, InterfaceState::ENABLED); else setStatus(s, InterfaceState::ENABLED); } template void ContainerBasePrivate::copyState(Interface::iterator external, const InterfacePtr& target, bool updated) { if (updated) { // update prio of all internal states linked to external auto internals{ externalToInternalMap().equal_range(&*external) }; for (auto& i = internals.first; i != internals.second; ++i) { // TODO: Not only update status, but full priority! setStatus(i->second, external->priority().status()); } return; } // create a clone of external state within target interface (child's starts() or ends()) auto internal = states_.insert(states_.end(), InterfaceState(*external)); target->add(*internal); // and remember the mapping between them internalToExternalMap().insert(std::make_pair(&*internal, &*external)); } void ContainerBasePrivate::copyState(Interface::Direction dir, Interface::iterator external, const InterfacePtr& target, bool updated) { if (dir == Interface::FORWARD) copyState(external, target, updated); else copyState(external, target, updated); } void ContainerBasePrivate::liftSolution(const SolutionBasePtr& solution, const InterfaceState* internal_from, const InterfaceState* internal_to) { computeCost(*internal_from, *internal_to, *solution); // map internal to external states auto find_or_create_external = [this](const InterfaceState* internal, bool& created) -> InterfaceState* { auto it = internalToExternalMap().find(internal); if (it != internalToExternalMap().end()) return const_cast(it->second); InterfaceState* external = &*states_.insert(states_.end(), InterfaceState(*internal)); internalToExternalMap().insert(std::make_pair(internal, external)); created = true; return external; }; bool created_from = false; bool created_to = false; InterfaceState* external_from = find_or_create_external(internal_from, created_from); InterfaceState* external_to = find_or_create_external(internal_to, created_to); if (!storeSolution(solution, external_from, external_to)) return; // connect solution to start/end state solution->setStartState(*external_from); solution->setEndState(*external_to); // spawn created states in external interfaces if (created_from) prevEnds()->add(*external_from); if (created_to) nextStarts()->add(*external_to); newSolution(solution); } ContainerBase::ContainerBase(ContainerBasePrivate* impl) : Stage(impl) {} size_t ContainerBase::numChildren() const { return pimpl()->children().size(); } Stage* ContainerBase::findChild(const std::string& name) const { auto pos = name.find('/'); const std::string first = name.substr(0, pos); for (const Stage::pointer& child : pimpl()->children()) if (child->name() == first) { if (pos == std::string::npos) return child.get(); else if (auto* parent = dynamic_cast(child.get())) return parent->findChild(name.substr(pos + 1)); } return nullptr; } bool ContainerBase::traverseChildren(const ContainerBase::StageCallback& processor) const { return pimpl()->traverseStages(processor, 0, 1); } bool ContainerBase::traverseRecursively(const ContainerBase::StageCallback& processor) const { if (!processor(*this, 0)) return false; return pimpl()->traverseStages(processor, 1, UINT_MAX); } void ContainerBase::add(Stage::pointer&& stage) { insert(std::move(stage), -1); } void ContainerBase::insert(Stage::pointer&& stage, int before) { if (!stage) throw std::runtime_error(name() + ": received invalid stage pointer"); StagePrivate* impl = stage->pimpl(); impl->setParent(this); ContainerBasePrivate::const_iterator where = pimpl()->childByIndex(before, true); ContainerBasePrivate::iterator it = pimpl()->children_.insert(where, std::move(stage)); impl->setParentPosition(it); } Stage::pointer ContainerBasePrivate::remove(ContainerBasePrivate::const_iterator pos) { if (pos == children_.end()) return Stage::pointer(); (*pos)->pimpl()->unparent(); Stage::pointer result = std::move(*children_.erase(pos, pos)); // stage from non-const iterator to pos children_.erase(pos); // actually erase stage return result; } Stage::pointer ContainerBase::remove(int pos) { return pimpl()->remove(pimpl()->childByIndex(pos, false)); } Stage::pointer ContainerBase::remove(Stage* child) { auto it = pimpl()->children_.begin(), end = pimpl()->children_.end(); for (; it != end && it->get() != child; ++it) ; return pimpl()->remove(it); } void ContainerBase::clear() { pimpl()->children_.clear(); } void ContainerBase::reset() { auto impl = pimpl(); // recursively reset children for (auto& child : impl->children()) child->reset(); // clear buffer interfaces impl->pending_backward_->clear(); impl->pending_forward_->clear(); // ... and state mapping impl->internalToExternalMap().clear(); // interfaces depend on children which might change impl->required_interface_ = UNKNOWN; impl->starts_.reset(); impl->ends_.reset(); Stage::reset(); } void ContainerBase::init(const moveit::core::RobotModelConstPtr& robot_model) { auto impl = pimpl(); auto& children = impl->children(); Stage::init(robot_model); // we need to have some children to do the actual work if (children.empty()) throw InitStageException(*this, "no children"); // recursively init all children and accumulate errors InitStageException errors; for (auto& child : children) { try { child->init(robot_model); } catch (const Property::error& e) { std::ostringstream oss; oss << e.what(); pimpl()->composePropertyErrorMsg(e.name(), oss); errors.push_back(*child, oss.str()); } catch (InitStageException& e) { errors.append(e); } } if (errors) throw errors; } std::ostream& operator<<(std::ostream& os, const ContainerBase& container) { ContainerBase::StageCallback processor = [&os](const Stage& stage, unsigned int depth) -> bool { os << std::string(2 * depth, ' ') << *stage.pimpl() << std::endl; return true; }; container.traverseRecursively(processor); return os; } // for debugging of how children interfaces evolve over time static void printChildrenInterfaces(const ContainerBase& container, bool success, const Stage& creator, std::ostream& os = std::cerr) { static unsigned int id = 0; const unsigned int width = 10; // indentation of name os << std::endl << (success ? '+' : '-') << ' ' << creator.name() << ' '; if (success) os << ++id << ' '; if (const Connecting* conn = dynamic_cast(&creator)) conn->pimpl()->printPendingPairs(os); os << std::endl; for (const auto& child : container.pimpl()->children()) { auto cimpl = child->pimpl(); os << std::setw(width) << std::left << child->name(); if (!cimpl->starts() && !cimpl->ends()) os << "↕ " << std::endl; if (cimpl->starts()) os << "↓ " << *child->pimpl()->starts() << std::endl; if (cimpl->starts() && cimpl->ends()) os << std::setw(width) << " "; if (cimpl->ends()) os << "↑ " << *child->pimpl()->ends() << std::endl; } } /** Collect all partial solution sequences originating from start into given direction */ template struct SolutionCollector { SolutionCollector(size_t max_depth, const SolutionBase& start) : max_depth(max_depth) { trace.reserve(max_depth); traverse(start, InterfaceState::Priority(0, 0.0)); assert(trace.empty()); } void traverse(const SolutionBase& start, const InterfaceState::Priority& prio) { const InterfaceState::Solutions& next = trajectories(*state(start)); if (next.empty()) { // when reaching the end, add the trace to solutions assert(prio.depth() == trace.size()); assert(prio.depth() <= max_depth); solutions.emplace_back(std::make_pair(trace, prio)); } else { for (SolutionBase* successor : next) { assert(!successor->isFailure()); // We shouldn't have invalid solutions trace.push_back(successor); traverse(*successor, prio + InterfaceState::Priority(1, successor->cost())); trace.pop_back(); } } } using SolutionCostPairs = std::list>; SolutionCostPairs solutions; const size_t max_depth; SolutionSequence::container_type trace; }; inline void updateStatePrio(const InterfaceState* state, const InterfaceState::Priority& prio) { if (state->owner()) // owner becomes NULL if state is removed from (pending) Interface list state->owner()->updatePriority(const_cast(state), // update depth + cost, but keep current status InterfaceState::Priority(prio, state->priority().status())); } template inline void updateStatePrios(const SolutionSequence::container_type& partial_solution_path, const InterfaceState::Priority& prio) { for (const SolutionBase* solution : partial_solution_path) updateStatePrio(state(*solution), prio); } void SerialContainer::onNewSolution(const SolutionBase& current) { // failures should never trigger this callback assert(!current.isFailure()); // states of solution must be active, otherwise this would not have been computed assert(current.start()->priority().enabled()); assert(current.end()->priority().enabled()); auto impl = pimpl(); const Stage* creator = current.creator(); auto& children = impl->children(); // find number of stages before and after creator stage size_t num_before = 0, num_after = 0; for (auto it = children.begin(), end = children.end(); it != end; ++it, ++num_before) if (&(**it) == creator) break; assert(num_before < children.size()); // creator should be one of our children num_after = children.size() - 1 - num_before; // find all incoming and outgoing solution paths originating from current solution SolutionCollector incoming(num_before, current); SolutionCollector outgoing(num_after, current); // collect (and sort) all solutions spanning from start to end of this container ordered sorted; for (auto& in : incoming.solutions) { for (auto& out : outgoing.solutions) { InterfaceState::Priority prio = in.second + InterfaceState::Priority(1u, current.cost()) + out.second; assert(prio.enabled()); // found a complete solution path connecting start to end? if (prio.depth() == children.size()) { SolutionSequence::container_type solution; solution.reserve(children.size()); // insert incoming solutions in reverse order solution.insert(solution.end(), in.first.rbegin(), in.first.rend()); // insert current solution solution.push_back(¤t); // insert outgoing solutions in normal order solution.insert(solution.end(), out.first.begin(), out.first.end()); // store solution in sorted list sorted.insert(std::make_shared(std::move(solution), prio.cost(), this)); } if (prio.depth() > 1) { // update state priorities along the whole partial solution path updateStatePrio(current.start(), prio); updateStatePrio(current.end(), prio); updateStatePrios(in.first, prio); updateStatePrios(out.first, prio); } } } // printChildrenInterfaces(*this, true, *current.creator()); // finally, store + announce new solutions to external interface for (const auto& solution : sorted) impl->liftSolution(solution, solution->internalStart(), solution->internalEnd()); } SerialContainer::SerialContainer(SerialContainerPrivate* impl) : ContainerBase(impl) {} SerialContainer::SerialContainer(const std::string& name) : SerialContainer(new SerialContainerPrivate(this, name)) {} SerialContainerPrivate::SerialContainerPrivate(SerialContainer* me, const std::string& name) : ContainerBasePrivate(me, name) {} void SerialContainerPrivate::connect(StagePrivate& stage1, StagePrivate& stage2) { InterfaceFlags flags1 = stage1.requiredInterface(); InterfaceFlags flags2 = stage2.requiredInterface(); if ((flags1 & WRITES_NEXT_START) && (flags2 & READS_START)) stage1.setNextStarts(stage2.starts()); else if ((flags1 & READS_END) && (flags2 & WRITES_PREV_END)) stage2.setPrevEnds(stage1.ends()); else { boost::format desc("cannot connect end interface of '%1%' (%2%) to start interface of '%3%' (%4%)"); desc % stage1.name() % flowSymbol(flags1); desc % stage2.name() % flowSymbol(flags2); throw InitStageException(*me(), desc.str()); } } template void SerialContainerPrivate::validateInterface(const StagePrivate& child, InterfaceFlags required) const { required = required & mask; if (required == UNKNOWN) return; // cannot yet validate InterfaceFlags child_interface = child.interfaceFlags() & mask; if (required != child_interface) { boost::format desc("%1% interface (%3%) of '%2%' does not match mine (%4%)"); desc % (mask == START_IF_MASK ? "start" : "end") % child.name(); desc % flowSymbol(child_interface) % flowSymbol(required); throw InitStageException(*me_, desc.str()); } } // called by parent asking for pruning of this' interface void SerialContainerPrivate::resolveInterface(InterfaceFlags expected) { // we need to have some children to do the actual work if (children().empty()) throw InitStageException(*me(), "no children"); if (!(expected & START_IF_MASK)) throw InitStageException(*me(), "unknown start interface"); Stage& first = *children().front(); Stage& last = *children().back(); InitStageException exceptions; try { // FIRST child first.pimpl()->resolveInterface(expected & START_IF_MASK); // connect first child's (start) push interface setChildsPushBackwardInterface(first.pimpl()); // validate that first child's and this container's start interfaces match validateInterface(*first.pimpl(), expected); // connect first child's (start) pull interface if (const InterfacePtr& target = first.pimpl()->starts()) starts_.reset(new Interface([this, target](Interface::iterator it, bool updated) { this->copyState(it, target, updated); })); } catch (InitStageException& e) { exceptions.append(e); } // process all children and connect them for (auto it = ++children().begin(), previous_it = children().begin(); it != children().end(); ++it, ++previous_it) { try { StagePrivate* child_impl = (**it).pimpl(); StagePrivate* previous_impl = (**previous_it).pimpl(); child_impl->resolveInterface(invert(previous_impl->requiredInterface()) & START_IF_MASK); connect(*previous_impl, *child_impl); } catch (InitStageException& e) { exceptions.append(e); } } try { // connect last child's (end) push interface setChildsPushForwardInterface(last.pimpl()); // validate that last child's and this container's end interfaces match validateInterface(*last.pimpl(), expected); // connect last child's (end) pull interface if (const InterfacePtr& target = last.pimpl()->ends()) ends_.reset(new Interface([this, target](Interface::iterator it, bool updated) { this->copyState(it, target, updated); })); } catch (InitStageException& e) { exceptions.append(e); } required_interface_ = (first.pimpl()->interfaceFlags() & START_IF_MASK) | // clang-format off (last.pimpl()->interfaceFlags() & END_IF_MASK); // clang-format off if (exceptions) throw exceptions; } void SerialContainerPrivate::validateConnectivity() const { ContainerBasePrivate::validateConnectivity(); InterfaceFlags mine = interfaceFlags(); // check that input / output interface of first / last child matches this' resp. interface validateInterface(*children().front()->pimpl(), mine); validateInterface(*children().back()->pimpl(), mine); // validate connectivity of children between each other // ContainerBasePrivate::validateConnectivity() ensures that required push interfaces are present, // that is, neighbouring stages have a corresponding pull interface. // Here, it remains to check that - if a child has a pull interface - it's indeed feeded. for (auto cur = children().begin(), end = children().end(); cur != end; ++cur) { const StagePrivate* const cur_impl = **cur; InterfaceFlags required = cur_impl->interfaceFlags(); // get iterators to prev / next stage in sequence auto prev = cur; --prev; auto next = cur; ++next; // start pull interface fed? if (cur != children().begin() && // first child has not a previous one (required & READS_START) && !(*prev)->pimpl()->nextStarts()) throw InitStageException(**cur, "start interface is not fed"); // end pull interface fed? if (next != end && // last child has not a next one (required & READS_END) && !(*next)->pimpl()->prevEnds()) throw InitStageException(**cur, "end interface is not fed"); } } bool SerialContainer::canCompute() const { for (const auto& stage : pimpl()->children()) { if (stage->pimpl()->canCompute()) return true; } return false; } void SerialContainer::compute() { for (const auto& stage : pimpl()->children()) { if (!stage->pimpl()->canCompute()) continue; stage->pimpl()->runCompute(); } } ParallelContainerBasePrivate::ParallelContainerBasePrivate(ParallelContainerBase* me, const std::string& name) : ContainerBasePrivate(me, name) {} void ParallelContainerBasePrivate::resolveInterface(InterfaceFlags expected) { // we need to have some children to do the actual work if (children().empty()) throw InitStageException(*me(), "no children"); InitStageException exceptions; bool first = true; for (const Stage::pointer& child : children()) { try { auto child_impl = child->pimpl(); child_impl->resolveInterface(expected); validateInterfaces(*child_impl, expected, first); // initialize push connections of children according to their demands setChildsPushForwardInterface(child_impl); setChildsPushBackwardInterface(child_impl); first = false; } catch (InitStageException& e) { exceptions.append(e); continue; } } if (exceptions) throw exceptions; required_interface_ = expected; initializeExternalInterfaces(); } void ParallelContainerBasePrivate::initializeExternalInterfaces() { // States received by the container need to be copied to all children's pull interfaces. if (requiredInterface() & READS_START) starts().reset(new Interface([this](Interface::iterator external, bool updated) { this->propagateStateToChildren(external, updated); })); if (requiredInterface() & READS_END) ends().reset(new Interface([this](Interface::iterator external, bool updated) { this->propagateStateToChildren(external, updated); })); } void ParallelContainerBasePrivate::validateInterfaces(const StagePrivate& child, InterfaceFlags& external, bool first) const { const InterfaceFlags child_interface = child.requiredInterface(); bool valid = true; for (InterfaceFlags mask : { START_IF_MASK, END_IF_MASK }) { if ((external & mask) == UNKNOWN) external |= child_interface & mask; valid = valid & ((external & mask) == (child_interface & mask)); } if (!valid) { boost::format desc("interface of '%1%' (%3% %4%) does not match %2% (%5% %6%)."); desc % child.name(); desc % (first ? "external one" : "other children's"); desc % flowSymbol(child_interface) % flowSymbol(child_interface); desc % flowSymbol(external) % flowSymbol(external); throw InitStageException(*me_, desc.str()); } } void ParallelContainerBasePrivate::validateConnectivity() const { InterfaceFlags my_interface = interfaceFlags(); // check that input / output interfaces of all children are handled by my interface for (const auto& child : children()) validateInterfaces(*child->pimpl(), my_interface); ContainerBasePrivate::validateConnectivity(); } template void ParallelContainerBasePrivate::propagateStateToChildren(Interface::iterator external, bool updated) { for (const Stage::pointer& stage : children()) copyState(external, stage->pimpl()->pullInterface(dir), updated); } ParallelContainerBase::ParallelContainerBase(ParallelContainerBasePrivate* impl) : ContainerBase(impl) {} ParallelContainerBase::ParallelContainerBase(const std::string& name) : ParallelContainerBase(new ParallelContainerBasePrivate(this, name)) {} void ParallelContainerBase::liftSolution(const SolutionBase& solution, double cost, std::string comment) { pimpl()->liftSolution(std::make_shared(this, &solution, cost, std::move(comment)), solution.start(), solution.end()); } void ParallelContainerBase::spawn(InterfaceState&& state, SubTrajectory&& t) { pimpl()->StagePrivate::spawn(std::move(state), std::make_shared(std::move(t))); } void ParallelContainerBase::sendForward(const InterfaceState& from, InterfaceState&& to, SubTrajectory&& t) { pimpl()->StagePrivate::sendForward(from, std::move(to), std::make_shared(std::move(t))); } void ParallelContainerBase::sendBackward(InterfaceState&& from, const InterfaceState& to, SubTrajectory&& t) { pimpl()->StagePrivate::sendBackward(std::move(from), to, std::make_shared(std::move(t))); } WrapperBasePrivate::WrapperBasePrivate(WrapperBase* me, const std::string& name) : ParallelContainerBasePrivate(me, name) {} WrapperBase::WrapperBase(const std::string& name, Stage::pointer&& child) : WrapperBase(new WrapperBasePrivate(this, name), std::move(child)) {} WrapperBase::WrapperBase(WrapperBasePrivate* impl, Stage::pointer&& child) : ParallelContainerBase(impl) { if (child) WrapperBase::insert(std::move(child)); } void WrapperBase::insert(Stage::pointer&& stage, int before) { // restrict num of children to one if (numChildren() > 0) throw std::runtime_error(name() + ": Wrapper only allows a single child"); return ParallelContainerBase::insert(std::move(stage), before); } Stage* WrapperBase::wrapped() { return pimpl()->children().empty() ? nullptr : pimpl()->children().front().get(); } bool WrapperBase::canCompute() const { return wrapped()->pimpl()->canCompute(); } void WrapperBase::compute() { wrapped()->pimpl()->runCompute(); } bool Alternatives::canCompute() const { for (const auto& stage : pimpl()->children()) if (stage->pimpl()->canCompute()) return true; return false; } void Alternatives::compute() { for (const auto& stage : pimpl()->children()) { stage->pimpl()->runCompute(); } } void Alternatives::onNewSolution(const SolutionBase& s) { liftSolution(s); } Fallbacks::Fallbacks(const std::string& name) : Fallbacks(new FallbacksPrivate(this, name)) {} Fallbacks::Fallbacks(FallbacksPrivate* impl) : ParallelContainerBase(impl) {} void Fallbacks::reset() { ParallelContainerBase::reset(); } void Fallbacks::init(const moveit::core::RobotModelConstPtr& robot_model) { auto& impl{ *pimpl() }; ParallelContainerBase::init(robot_model); impl.current_generator_ = impl.children().begin(); impl.current_pending_ = impl.pending_states_.end(); } bool Fallbacks::canCompute() const { auto impl { pimpl() }; switch (impl->requiredInterface()) { case GENERATE: // current_generator_ is fixed if it produced solutions before if (!solutions().empty()) return (*impl->current_generator_)->pimpl()->canCompute(); else { // move to first generator that can run while(impl->current_generator_ != impl->children().end() && !(*impl->current_generator_)->pimpl()->canCompute()) { ROS_DEBUG_STREAM_NAMED("Fallbacks", "Generator '" << (*impl->current_generator_)->name() << "' can't compute, trying next one."); ++impl->current_generator_; } return impl->current_generator_ != impl->children().end(); } break; case PROPAGATE_FORWARDS: case PROPAGATE_BACKWARDS: case CONNECT: return !impl->pending_states_.empty(); default: assert(false); } } void Fallbacks::compute() { auto impl { pimpl() }; switch (impl->requiredInterface()) { case GENERATE: impl->computeGenerate(); break; case PROPAGATE_FORWARDS: case PROPAGATE_BACKWARDS: case CONNECT: impl->computePropagate(); break; default: assert(false); } } void Fallbacks::onNewSolution(const SolutionBase& s) { liftSolution(s); } FallbacksPrivate::FallbacksPrivate(Fallbacks* me, const std::string& name) : ParallelContainerBasePrivate(me, name) {} void FallbacksPrivate::initializeExternalInterfaces() { if (requiredInterface() & READS_START) starts().reset(new Interface([this](Interface::iterator external, bool updated) { this->onNewExternalState(external, updated); })); if (requiredInterface() & READS_END) ends().reset(new Interface([this](Interface::iterator external, bool updated) { this->onNewExternalState(external, updated); })); } void FallbacksPrivate::onNewFailure(const Stage& /*child*/, const InterfaceState* /*from*/, const InterfaceState* /*to*/) { // This override is deliberately empty. // The method prunes solution paths when a child failed to find a valid solution for it, // but in Fallbacks the next child might still yield a successful solution // Thus pruning must only occur once the last child is exhausted (inside computePropagate) } void FallbacksPrivate::computeGenerate() { assert(current_generator_ != children().end()); (*current_generator_)->pimpl()->runCompute(); } inline void FallbacksPrivate::printPending(const char* comment) const { ROSCONSOLE_DEFINE_LOCATION(true, ::ros::console::levels::Debug, ROSCONSOLE_NAME_PREFIX ".Fallbacks"); if (ROS_UNLIKELY(__rosconsole_define_location__enabled)) { std::cout << name() << ": " << comment; std::for_each(pending_states_.begin(), pending_states_.end(), [](const auto& e) { std::cout << e.external_state->priority() << " "; }); std::cout << std::endl; } } template void FallbacksPrivate::onNewExternalState(Interface::iterator external, bool updated) { if (updated) { auto it = std::find_if(pending_states_.begin(), pending_states_.end(), [external](const ExternalState& s) { return s.external_state == external; }); if (it == pending_states_.cend()) return; // already processed pending_states_.update(it); // update sorting pos of this single item printPending("after update: "); // update prio of linked internal states as well ContainerBasePrivate::copyState(external, InterfacePtr(), updated); return; } // remember external state for later processing by children. // children().end() indicates that the states wasn't yet forwarded to any child pending_states_.push(ExternalState(external, dir, children().cend())); printPending("after push: "); } void FallbacksPrivate::computePropagate(){ while (!pending_states_.empty()) { printPending(); // If we have a currently active pending state, proceed with this one // even if pending_states_.front() might be different meanwhile. // This is important as we need to feed states one by one to the children. // Otherwise we cannot know if a child is exhausted on a specific input state. if (current_pending_ == pending_states_.end()) current_pending_ = pending_states_.begin(); auto current = current_pending_; auto pushState = [this](const ExternalState& ext) { ROS_DEBUG_STREAM_NAMED("Fallbacks", "Push external state (" << ext.external_state->priority() << ") to '" << (*ext.stage)->name() << "'"); copyState(ext.dir, ext.external_state, (*ext.stage)->pimpl()->pullInterface(ext.dir), false); }; if (current->stage == children().cend()) { current->stage = children().begin(); // activate first child pushState(*current); } StagePrivate* child = (*current->stage)->pimpl(); if (child->canCompute()) { child->runCompute(); return; // return after first compute() } auto has_solutions{ [](const InterfaceState& s, Interface::Direction d){ const auto& trajectories { d == Interface::FORWARD ? s.outgoingTrajectories() : s.incomingTrajectories() }; return std::find_if(trajectories.cbegin(), trajectories.cend(), [](const auto& t){ return !t->isFailure();}) != trajectories.cend(); }}; if(!has_solutions(*current->external_state, current->dir)){ ++current->stage; if(current->stage != children().cend()){ ROS_DEBUG_STREAM_NAMED("Fallbacks", "Child '" << child->name() << "' failed generating solutions, trying next child: '" << (*current->stage)->name() << "'"); pushState(*current); } else { ROS_DEBUG_STREAM_NAMED("Fallbacks", "Failed to extend state with all children, pruning path"); parent()->pimpl()->onNewFailure(*me(), current->dir == Interface::FORWARD ? &*current->external_state : nullptr, current->dir == Interface::BACKWARD ? nullptr : &*current->external_state); pending_states_.erase(current); current_pending_ = pending_states_.end(); } } else { ROS_DEBUG_STREAM_NAMED("Fallbacks", "Child '" << child->name() << "' exhausted, but produced solutions before, not invoking further fallbacks"); pending_states_.erase(current); current_pending_ = pending_states_.end(); } // continue processing with next pending state as we didn't runCompute() yet } } MergerPrivate::MergerPrivate(Merger* me, const std::string& name) : ParallelContainerBasePrivate(me, name) {} void MergerPrivate::resolveInterface(InterfaceFlags expected) { ParallelContainerBasePrivate::resolveInterface(expected); switch (requiredInterface()) { case PROPAGATE_FORWARDS: case PROPAGATE_BACKWARDS: case UNKNOWN: break; // these are supported case GENERATE: throw InitStageException(*me_, "Generator stages not yet supported."); case CONNECT: throw InitStageException(*me_, "Cannot merge connecting stages. Use Connect."); default: throw InitStageException(*me_, "Children's interface not supported."); } } Merger::Merger(const std::string& name) : Merger(new MergerPrivate(this, name)) {} void Merger::reset() { ParallelContainerBase::reset(); auto impl = pimpl(); impl->jmg_merged_.reset(); impl->source_state_to_solutions_.clear(); } void Merger::init(const core::RobotModelConstPtr& robot_model) { ParallelContainerBase::init(robot_model); } Merger::Merger(MergerPrivate* impl) : ParallelContainerBase(impl) {} bool Merger::canCompute() const { for (const auto& stage : pimpl()->children()) if (stage->pimpl()->canCompute()) return true; return false; } void Merger::compute() { for (const auto& stage : pimpl()->children()) { stage->pimpl()->runCompute(); } } void Merger::onNewSolution(const SolutionBase& s) { if (s.isFailure()) // ignore failure solutions return; auto impl = pimpl(); switch (impl->interfaceFlags()) { case PROPAGATE_FORWARDS: case PROPAGATE_BACKWARDS: impl->onNewPropagateSolution(s); break; case GENERATE: impl->onNewGeneratorSolution(s); break; default: assert(false); } } void MergerPrivate::onNewPropagateSolution(const SolutionBase& s) { const SubTrajectory* trajectory = dynamic_cast(&s); if (!trajectory || !trajectory->trajectory()) { ROS_ERROR_NAMED("Merger", "Only simple, valid trajectories are supported"); return; } InterfaceFlags dir = interfaceFlags(); assert(dir == PROPAGATE_FORWARDS || dir == PROPAGATE_BACKWARDS); // internal source state const InterfaceState* source_state = (dir == PROPAGATE_FORWARDS) ? s.start() : s.end(); // map to external source state that is shared by all children auto source_it = internalToExternalMap().find(source_state); // internal->external mapping for source state should have been created assert(source_it != internalToExternalMap().end()); const InterfaceState* external_source_state = &*source_it->second; // retrieve (or create if necessary) the ChildSolutionMap for the given external source state ChildSolutionMap& all_solutions = source_state_to_solutions_.insert(std::make_pair(external_source_state, ChildSolutionMap())).first->second; // retrieve (or create if necessary) the ChildSolutionList corresponding to the child ChildSolutionList& child_solutions = all_solutions.insert(std::make_pair(s.creator(), ChildSolutionList())).first->second; // insert the new child solution into the list child_solutions.push_back(trajectory); // do we have solutions for all children? if (all_solutions.size() < children().size()) return; assert(all_solutions.size() == children().size()); // combine the new solution with all solutions from other children auto spawner = dir == PROPAGATE_FORWARDS ? &MergerPrivate::sendForward : &MergerPrivate::sendBackward; mergeAnyCombination(all_solutions, s, external_source_state->scene(), std::bind(spawner, this, std::placeholders::_1, external_source_state)); } void MergerPrivate::sendForward(SubTrajectory&& t, const InterfaceState* from) { // generate target state planning_scene::PlanningScenePtr to = from->scene()->diff(); if (t.trajectory() && !t.trajectory()->empty()) to->setCurrentState(t.trajectory()->getLastWayPoint()); StagePrivate::sendForward(*from, InterfaceState(to), std::make_shared(std::move(t))); } void MergerPrivate::sendBackward(SubTrajectory&& t, const InterfaceState* to) { // generate target state planning_scene::PlanningScenePtr from = to->scene()->diff(); if (t.trajectory() && !t.trajectory()->empty()) from->setCurrentState(t.trajectory()->getFirstWayPoint()); StagePrivate::sendBackward(InterfaceState(from), *to, std::make_shared(std::move(t))); } void MergerPrivate::onNewGeneratorSolution(const SolutionBase& /* s */) { // TODO: implement in similar fashion as onNewPropagateSolution(), but also merge start/end states } void MergerPrivate::mergeAnyCombination(const ChildSolutionMap& all_solutions, const SolutionBase& current, const planning_scene::PlanningSceneConstPtr& start_scene, const Spawner& spawner) { std::vector indices; // which solution index was considered last for i-th child? indices.reserve(children().size()); ChildSolutionList sub_solutions; sub_solutions.reserve(children().size()); // initialize vector of sub solutions for (const auto& pair : all_solutions) { // all children, except current solution's creator, start with zero index indices.push_back(pair.first != current.creator() ? 0 : pair.second.size() - 1); sub_solutions.push_back(pair.second[indices.back()]); } while (true) { merge(sub_solutions, start_scene, spawner); // compose next combination size_t child = 0; for (auto it = all_solutions.cbegin(), end = all_solutions.cend(); it != end; ++it, ++child) { if (it->first == current.creator()) continue; // skip current solution's child if (++indices[child] >= it->second.size()) { indices[child] = 0; // start over with zero sub_solutions[child] = it->second[indices[child]]; continue; // and continue with next child } // otherwise, a new solution combination is available sub_solutions[child] = it->second[indices[child]]; break; } if (child == children().size()) // all combinations exhausted? break; } } void MergerPrivate::merge(const ChildSolutionList& sub_solutions, const planning_scene::PlanningSceneConstPtr& start_scene, const Spawner& spawner) { // transform vector of SubTrajectories into vector of RobotTrajectories std::vector sub_trajectories; sub_trajectories.reserve(sub_solutions.size()); for (const auto& sub : sub_solutions) sub_trajectories.push_back(sub->trajectory()); moveit::core::JointModelGroup* jmg = jmg_merged_.get(); robot_trajectory::RobotTrajectoryPtr merged; try { merged = task_constructor::merge(sub_trajectories, start_scene->getCurrentState(), jmg); } catch (const std::runtime_error& e) { SubTrajectory t; t.markAsFailure(); t.setComment(e.what()); spawner(std::move(t)); return; } if (jmg_merged_.get() != jmg) jmg_merged_.reset(jmg); assert(merged); SubTrajectory t(merged); // check merged trajectory for collisions std::vector invalid_index; if (!start_scene->isPathValid(*merged, "", true, &invalid_index)) { t.markAsFailure(); std::ostringstream oss; oss << "Invalid waypoint(s): "; if (invalid_index.size() == merged->getWayPointCount()) oss << "all"; else for (size_t i : invalid_index) oss << i << ", "; t.setComment(oss.str()); } else { // accumulate costs and markers double costs = 0.0; for (const auto& sub : sub_solutions) { costs += sub->cost(); t.markers().insert(t.markers().end(), sub->markers().begin(), sub->markers().end()); } t.setCost(costs); } spawner(std::move(t)); } } // namespace task_constructor } // namespace moveit