58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
#
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# micro_graph.py
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#
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# This source file is part of the FoundationDB open source project
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#
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# Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import fdb
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fdb.api_version(300)
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db = fdb.open()
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graph = fdb.Subspace(('G',))
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edge = graph['E']
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inverse = graph['I']
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@fdb.transactional
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def set_edge(tr, node, neighbor):
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tr[edge[node][neighbor]] = ''
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tr[inverse[neighbor][node]] = ''
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@fdb.transactional
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def del_edge(tr, node, neighbor):
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del tr[edge[node][neighbor]]
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del tr[inverse[neighbor][node]]
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@fdb.transactional
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def get_out_neighbors(tr, node):
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return [edge.unpack(k)[1] for k, _ in tr[edge[node].range()]]
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@fdb.transactional
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def get_in_neighbors(tr, node):
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return [inverse.unpack(k)[1] for k, _ in tr[inverse[node].range()]]
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@fdb.transactional
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def clear_subspace(tr, subspace):
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tr.clear_range_startswith(subspace.key())
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clear_subspace(db, graph)
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