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Diffstat (limited to 'include/query/pointlookup.h')
| -rw-r--r-- | include/query/pointlookup.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/include/query/pointlookup.h b/include/query/pointlookup.h new file mode 100644 index 0000000..caaa320 --- /dev/null +++ b/include/query/pointlookup.h @@ -0,0 +1,117 @@ +/* + * include/query/pointlookup.h + * + * Copyright (C) 2024 Douglas B. Rumbaugh <drumbaugh@psu.edu> + * + * Distributed under the Modified BSD License. + * + * A query class for point lookup operations. + * + * TODO: Currently, this only supports point lookups for unique keys (which + * is the case for the trie that we're building this to use). It would be + * pretty straightforward to extend it to return *all* records that match + * the search_key (including tombstone cancellation--it's invertible) to + * support non-unique indexes, or at least those implementing + * lower_bound(). + */ +#pragma once + +#include "framework/QueryRequirements.h" + +namespace de { namespace pl { + +template <RecordInterface R> +struct Parms { + decltype(R::key) search_key; +}; + +template <RecordInterface R> +struct State { +}; + +template <RecordInterface R> +struct BufferState { + BufferView<R> *buffer; + + BufferState(BufferView<R> *buffer) + : buffer(buffer) {} +}; + +template <KVPInterface R, ShardInterface<R> S> +class Query { +public: + constexpr static bool EARLY_ABORT=true; + constexpr static bool SKIP_DELETE_FILTER=true; + + static void *get_query_state(S *shard, void *parms) { + return nullptr; + } + + static void* get_buffer_query_state(BufferView<R> *buffer, void *parms) { + auto res = new BufferState<R>(buffer); + + return res; + } + + static void process_query_states(void *query_parms, std::vector<void*> &shard_states, void* buffer_state) { + return; + } + + static std::vector<Wrapped<R>> query(S *shard, void *q_state, void *parms) { + auto p = (Parms<R> *) parms; + auto s = (State<R> *) q_state; + + std::vector<Wrapped<R>> result; + + auto r = shard->point_lookup({p->search_key, 0}); + + if (r) { + result.push_back(*r); + } + + return result; + } + + static std::vector<Wrapped<R>> buffer_query(void *state, void *parms) { + auto p = (Parms<R> *) parms; + auto s = (BufferState<R> *) state; + + std::vector<Wrapped<R>> records; + for (size_t i=0; i<s->buffer->get_record_count(); i++) { + auto rec = s->buffer->get(i); + + if (rec->rec.key == p->search_key) { + records.push_back(*rec); + return records; + } + } + + return records; + } + + static std::vector<R> merge(std::vector<std::vector<Wrapped<R>>> &results, void *parms) { + std::vector<R> output; + for (auto r : results) { + if (r.size() > 0) { + if (r[0].is_deleted() || r[0].is_tombstone()) { + return output; + } + + output.append(r[0].rec); + return output; + } + } + } + + static void delete_query_state(void *state) { + auto s = (State<R> *) state; + delete s; + } + + static void delete_buffer_query_state(void *state) { + auto s = (BufferState<R> *) state; + delete s; + } +}; + +}} |