{"id":50533,"date":"2023-08-31T02:10:42","date_gmt":"2023-01-27T17:59:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/janusgraph%e7%9a%84%e4%ba%8b%e5%8a%a1\/"},"modified":"2024-04-30T20:51:44","modified_gmt":"2024-04-30T12:51:44","slug":"janusgraph%e7%9a%84%e4%ba%8b%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/janusgraph%e7%9a%84%e4%ba%8b%e5%8a%a1\/","title":{"rendered":"JanusGraph\u7684\u4e8b\u52a1"},"content":{"rendered":"

\u5904\u7406\u6570\u636e\u5e93\u65f6\uff0c\u4e3a\u4e86\u4fdd\u6301\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u5fc5\u987b\u5173\u6ce8\u4e8b\u52a1\u3002\u7531\u4e8eJanusGraph\u4e5f\u652f\u6301\u4e8b\u52a1\uff0c\u6240\u4ee5\u9700\u8981\u786e\u8ba4\u5982\u4f55\u5904\u7406\u3002<\/p>\n

\u786e\u8ba4\u662f\u5426\u652f\u6301\u4ea4\u6613\u652f\u6301\u3002<\/h2>\n

\u53ef\u4ee5\u901a\u8fc7Graph.features()\u83b7\u53d6\u7531TinkerPop\u89c4\u8303\u652f\u6301\u7684\u56fe\u6570\u636e\u5e93\u529f\u80fd\u5217\u8868\u3002\u53ef\u4ee5\u5728Gremlin\u63a7\u5236\u53f0\u4e2d\u8f93\u5165\u5e76\u5c1d\u8bd5\u3002<\/p>\n

gremlin<\/span>><\/span> graph<\/span> =<\/span> JanusGraphFactory<\/span>.<\/span>open<\/span>(<\/span>\"conf\/janusgraph-berkeleyje.properties\"<\/span>)<\/span>\r\n==><\/span>standardjanusgraph<\/span>[<\/span>berkeleyje:C:<\/span>\\<\/span>******<\/span>\\<\/span>janusgraph<\/span>-<\/span>0.5<\/span>.<\/span>1<\/span>\\<\/span>conf<\/span>\\<\/span>..<\/span>\/db\/<\/span>berkeley<\/span>]<\/span>\r\n==><\/span>FEATURES<\/span>\r\n><\/span> GraphFeatures<\/span>\r\n>--<\/span> IoRead:<\/span> true<\/span>\r\n>--<\/span> Computer:<\/span> true<\/span>\r\n>--<\/span> IoWrite:<\/span> true<\/span>\r\n>--<\/span> Transactions:<\/span> true<\/span>  \/\/ \u30b3\u30b3\uff01<\/span>\r\n>--<\/span> Persistence:<\/span> true<\/span>\r\n>--<\/span> ConcurrentAccess:<\/span> true<\/span>\r\n>--<\/span> ThreadedTransactions:<\/span> true<\/span>  \/\/ \u3042\u3068\u30b3\u30b3\uff01<\/span>\r\n(<\/span>\u7565<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u5982\u679cTransactions\u7684\u9879\u4e3atrue\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u4e8b\u52a1\u3002\u4f8b\u5982\uff0c\u4f7f\u7528TinkerGraph.open()\u751f\u6210\u7684\u56fe\u4e0d\u652f\u6301\u4e8b\u52a1\u3002<\/p>\n
gremlin<\/span>><\/span> graph<\/span> =<\/span> TinkerGraph<\/span>.<\/span>open<\/span>()<\/span>\r\n==><\/span>tinkergraph<\/span>[<\/span>vertices:<\/span>0<\/span> edges:<\/span>0<\/span>]<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>features<\/span>()<\/span>\r\n==><\/span>FEATURES<\/span>\r\n><\/span> GraphFeatures<\/span>\r\n>--<\/span> IoRead:<\/span> true<\/span>\r\n>--<\/span> Computer:<\/span> true<\/span>\r\n>--<\/span> IoWrite:<\/span> true<\/span>\r\n>--<\/span> Transactions:<\/span> false<\/span>  \/\/ \u30c0\u30e1\uff01<\/span>\r\n>--<\/span> Persistence:<\/span> true<\/span>\r\n>--<\/span> ConcurrentAccess:<\/span> false<\/span>\r\n>--<\/span> ThreadedTransactions:<\/span> false<\/span>  \/\/ \u30c0\u30e1\uff01<\/span>\r\n<\/code><\/pre>\n
\u5982\u679cThreadedTransactions\u4e3atrue\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u4e00\u4e2a\u4e8b\u52a1\u7684\u529f\u80fd\uff08\u5177\u4f53\u7528\u9014\u867d\u7136\u4e0d\u786e\u5b9a\uff0c\u4f46\u53ef\u80fd\u4f1a\u5728\u5206\u6563\u91cd\u8d1f\u8f7d\u5904\u7406\u65f6\u4f7f\u7528\uff09\u3002<\/p>\n
\u5982\u679c\u8ba4\u4e3a\u4f7f\u7528features()\u65f6\u65e5\u5fd7\u7684\u663e\u793a\u4e0d\u6e05\u6670\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u9010\u4e2a\u786e\u8ba4\u3002<\/p>\n
gremlin<\/span>><\/span> graph<\/span>.<\/span>features<\/span>().<\/span>graph<\/span>().<\/span>supportsTransactions<\/span>()<\/span>\r\n==><\/span>true<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>features<\/span>().<\/span>graph<\/span>().<\/span>supportsThreadedTransactions<\/span>()<\/span>\r\n==><\/span>true<\/span>\r\n<\/code><\/pre>\n
\u8bbf\u95ee\u670d\u52a1\u5668\u65f6\u7684\u4ea4\u6613\u9650\u5236<\/h2>\n
\u5728\u4e4b\u524d\u7684\u6587\u7ae0\u300aJanusGraph\u7684\u4e24\u79cd\u7528\u6cd5\u300b\u4e2d\u5df2\u7ecf\u63d0\u5230\uff0c\u5982\u679c\u8981\u8bbf\u95ee\u56fe\u5f62\u6570\u636e\u5e93\u670d\u52a1\u5668\u5e76\u8fdb\u884c\u67e5\u8be2\uff08\u5373\u8fdc\u7a0b\u60c5\u51b5\uff09\uff0c\u4e8b\u52a1\u7684\u4f7f\u7528\u4f1a\u53d7\u5230\u9650\u5236\u3002<\/p>\n
\"JanusGraph-article01(1).png\"<\/div>\n
\u53d1\u9001\u7684\u67e5\u8be2\u5c06\u81ea\u52a8\u5305\u88c5\u5728\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u5e76\u6267\u884c\u3002\u56e0\u6b64\uff0c\u65e0\u6cd5\u5c06\u4e24\u4e2a\u67e5\u8be2\u7ec4\u5408\u6210\u4e00\u4e2a\u4e8b\u52a1\u3002\u4f46\u662f\uff0c\u5728Gremlin\u4e2d\uff0c\u53ef\u4ee5\u7f16\u5199\u590d\u6742\u7684\u67e5\u8be2\uff0c\u4e00\u6b21\u83b7\u53d6\u3001\u6dfb\u52a0\u3001\u7f16\u8f91\u6216\u5220\u9664\u591a\u4e2a\u5143\u7d20\uff08\u9876\u70b9\/\u8fb9\/\u5c5e\u6027\uff09\uff0c\u6240\u4ee5\u5e94\u8be5\u6ca1\u6709\u592a\u5927\u7684\u4e0d\u4fbf\u3002\u4e0a\u9762\u56fe\u4e2d\u7684\u4e24\u4e2a\u67e5\u8be2\u53ef\u4ee5\u50cf g.addV(“person”).V().count() \u8fd9\u6837\u5408\u5e76\u3002<\/p>\n
\u5982\u679c\u4f60\u786e\u5b9e\u60f3\u8981\u5b8c\u5168\u63a7\u5236\u4e8b\u52a1\u7684\u8bdd\uff0c\u5efa\u8bae\u4f60\u5c1d\u8bd5\u4e0a\u8ff0\u6587\u7ae0\u4e2d\u4f7f\u7528Cluster\u548cClient\u7684\u8fde\u63a5\u65b9\u6cd5\u3002\u867d\u7136\u4e0d\u662f\u7279\u522b\u63a8\u8350\u8fd9\u6837\u505a\u3002<\/p>\n
TinkerPop\u4e8b\u52a1\u7684\u57fa\u7840<\/h2>\n
\u4ee5\u4e0b\u7684\u63cf\u8ff0\u662f\u57fa\u4e8e\u8fde\u63a5\u5230\u5d4c\u5165\u5f0f\u6570\u636e\u5e93\uff08\u800c\u975e\u8fdc\u7a0b\u6570\u636e\u5e93\uff09\u7684\u524d\u63d0\u3002<\/p>\n
\u4ea4\u6613\u63a5\u53e3<\/h3>\n
\u5904\u7406\u4e8b\u52a1\u65f6\uff0c\u8bf7\u4f7f\u7528graph.tx()\u6216g.tx()\u3002\u7531\u4e8eg.tx()\u88ab\u660e\u786e\u8868\u793a\u4e3agraph.tx()\u7684\u4ee3\u7406\uff0c\u6240\u4ee5\u8fd9\u4e24\u8005\u6267\u884c\u5b8c\u5168\u76f8\u540c\u7684\u64cd\u4f5c\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u4e00\u4e2a\u559c\u6b22\u7684\u65b9\u5f0f\u3002\u8fd4\u56de\u4e00\u4e2aTransaction\u4f5c\u4e3a\u7ed3\u679c\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u8981\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n
\u4ea4\u6613\u529f\u80fd\u65b9\u6cd5\u5217\u8868\uff08\u90e8\u5206\uff09<\/p>\n
\n
\u30e1\u30bd\u30c3\u30c9\u8aac\u660eopen\u660e\u793a\u7684\u306b\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u958b\u59cb\u3059\u308bisOpen\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u958b\u59cb\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u53d6\u5f97\u3059\u308bclose\u660e\u793a\u7684\u306b\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u9589\u3058\u308b\u3002commit\u3055\u308c\u308b\u304brollback\u3055\u308c\u308b\u304b\u3001\u3042\u308b\u3044\u306f\u30a8\u30e9\u30fc\u306b\u306a\u308b\u304b\u306fonClose\u306e\u8a2d\u5b9a\u306b\u3088\u308brollback\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u5185\u5bb9\u3092\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3059\u308bcommit\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u5185\u5bb9\u3092\u30b3\u30df\u30c3\u30c8\u3059\u308bonReadWrite\u30b0\u30e9\u30d5\u306e\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u8aad\u307f\u66f8\u304d\u304c\u884c\u308f\u308c\u305f\u5834\u5408\u3001\u81ea\u52d5\u7684\u306b\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u958b\u59cb\u3059\u308b\u304b\u3069\u3046\u304b\u8a2d\u5b9a\u3059\u308bonCloseclose\u304c\u547c\u3070\u308c\u305f\u969b\u306e\u6319\u52d5\u3092\u8a2d\u5b9a\u3059\u308bcreateThreadedTx\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u306b\u5bfe\u5fdc\u3057\u305f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u958b\u59cb\u3057\u3001\u5c02\u7528\u306eGraph\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u8fd4\u3059<\/div>\n<\/div>\n
\u5f00\u59cb\u4ea4\u6613<\/h3>\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e8b\u52a1\u4f1a\u81ea\u52a8\u5f00\u59cb\u3002\u5176\u89e6\u53d1\u65f6\u95f4\u662f\u5728\u9996\u6b21\u5bf9\u56fe\u8fdb\u884c\u64cd\u4f5c\uff08\u67e5\u8be2\uff09\u7684\u77ac\u95f4\u3002\u4f8b\u5982\uff0c\u5728\u6267\u884cg.V()\u3001g.E()\u3001graph.addVertex()\u3001graph.addEdge()\u3001graph.vertices()\u3001graph.edges()\u7b49\u51fd\u6570\u65f6\u3002<\/p>\n
\u53ef\u4ee5\u901a\u8fc7graph.tx().isOpen\u6765\u68c0\u67e5\u4e8b\u52a1\u662f\u5426\u5df2\u7ecf\u5f00\u59cb\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u4e00\u4e0b\u3002<\/p>\n
gremlin<\/span>><\/span> graph<\/span> =<\/span> JanusGraphFactory<\/span>.<\/span>open<\/span>(<\/span>\"conf\/janusgraph-berkeleyje.properties\"<\/span>)<\/span>\r\n==><\/span>standardjanusgraph<\/span>[<\/span>berkeleyje:C:<\/span>\\<\/span>******<\/span>\\<\/span>janusgraph<\/span>-<\/span>0.5<\/span>.<\/span>1<\/span>\\<\/span>conf<\/span>\\<\/span>..<\/span>\/db\/<\/span>berkeley<\/span>]<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>tx<\/span>().<\/span>isOpen<\/span>()<\/span>\r\n==><\/span>false<\/span>  \/\/ \u307e\u3060\u958b\u59cb\u3055\u308c\u3066\u3044\u306a\u3044<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>vertices<\/span>()<\/span>  \/\/ \u3053\u3053\u3067\u958b\u59cb\u3055\u308c\u308b<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>tx<\/span>().<\/span>isOpen<\/span>()<\/span>\r\n==><\/span>true<\/span>\r\n<\/code><\/pre>\n
\u80af\u5b9a\u5df2\u7ecf\u5f00\u59cb\u4e86\u3002<\/p>\n
\u63d0\u4ea4\u548c\u56de\u6eda<\/h3>\n
\u5982\u679c\u53ea\u662f\u8fdb\u884c\u53ea\u8bfb\u67e5\u8be2\uff0c\u90a3\u4e48\u5c31\u6ca1\u6709\u5fc5\u8981\u7279\u522b\u62c5\u5fc3\uff0c\u4f46\u5982\u679c\u5bf9\u56fe\u8fdb\u884c\u4e86\u66f4\u6539\uff08\u5199\u5165\uff09\uff0c\u90a3\u4e48\u8fd9\u4e9b\u66f4\u6539\u5c1a\u672a\u786e\u5b9a\u3002\u8981\u786e\u5b9a\u8fd9\u4e9b\u66f4\u6539\uff0c\u9700\u8981\u8fdb\u884c\u63d0\u4ea4\u3002\u6216\u8005\u5728\u4e8b\u52a1\u4e2d\u51fa\u73b0\u4e86\u9519\u8bef\u6216\u5176\u4ed6\u4e0d\u4fbf\u65f6\uff0c\u9700\u8981\u8fdb\u884c\u56de\u6eda\u4ee5\u53d6\u6d88\u6240\u6709\u5df2\u8fdb\u884c\u7684\u66f4\u6539\u3002<\/p>\n
\u56de\u6eda\u64cd\u4f5c\u53ef\u4ee5\u901a\u8fc7graph.tx().rollback()\u6765\u6267\u884c\u3002<\/p>\n
gremlin<\/span>><\/span> g<\/span>.<\/span>V<\/span>().<\/span>count<\/span>()<\/span>\r\n==><\/span>0<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>addV<\/span>(<\/span>\"person\"<\/span>).<\/span>iterate<\/span>()<\/span>  \/\/ \u9802\u70b9\u3092\u8ffd\u52a0\u3057\u305f<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>V<\/span>().<\/span>count<\/span>()<\/span>\r\n==><\/span>1<\/span>  \/\/ \u73fe\u6642\u70b9\u3067\u306f\u53cd\u6620\u3055\u308c\u3066\u3044\u308b(\u304c\u3001\u78ba\u5b9a\u3067\u306f\u306a\u3044)<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>tx<\/span>().<\/span>rollback<\/span>()<\/span>  \/\/ \u53d6\u308a\u6d88\u3059<\/span>\r\n==><\/span>null<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>V<\/span>().<\/span>count<\/span>()<\/span>\r\n==><\/span>0<\/span>  \/\/ \u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3055\u308c\u305f<\/span>\r\n<\/code><\/pre>\n
\u63d0\u4ea4\u7531graph.tx().commit()\u5b8c\u6210\u3002<\/p>\n
gremlin<\/span>><\/span> g<\/span>.<\/span>V<\/span>().<\/span>count<\/span>()<\/span>\r\n==><\/span>0<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>addV<\/span>(<\/span>\"person\"<\/span>).<\/span>iterate<\/span>()<\/span>  \/\/ \u9802\u70b9\u3092\u8ffd\u52a0\u3057\u305f<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>V<\/span>().<\/span>count<\/span>()<\/span>\r\n==><\/span>1<\/span>\u3000<\/span>\/\/ \u73fe\u6642\u70b9\u3067\u306f\u53cd\u6620\u3055\u308c\u3066\u3044\u308b(\u304c\u3001\u78ba\u5b9a\u3067\u306f\u306a\u3044)<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>tx<\/span>().<\/span>commit<\/span>()<\/span>  \/\/ \u78ba\u5b9a\u3055\u305b\u308b<\/span>\r\n==><\/span>null<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>V<\/span>().<\/span>count<\/span>()<\/span>\r\n==><\/span>1<\/span>  \/\/ \u30b3\u30df\u30c3\u30c8\u3055\u308c\u305f<\/span>\r\n<\/code><\/pre>\n
\u5728\u7f16\u5199\u7a0b\u5e8f\u65f6\uff0c\u5982\u679c\u53d1\u751f\u9519\u8bef\uff0c\u6700\u540e\u5e94\u6267\u884c\u56de\u6eda\u64cd\u4f5c\uff1b\u5982\u679c\u6ca1\u6709\u9519\u8bef\uff0c\u5219\u5e94\u6267\u884c\u63d0\u4ea4\u64cd\u4f5c\u3002<\/p>\n
\u6267\u884c\u63d0\u4ea4\u6216\u56de\u6eda\u64cd\u4f5c\u65f6\uff0c\u4e8b\u52a1\u5c06\u88ab\u5173\u95ed\u3002<\/p>\n
\u660e\u786e\u6267\u884c\u4ea4\u6613\u7684\u5f00\u59cb<\/h3>\n
\u4e5f\u8bb8\u6709\u4e9b\u4eba\u89c9\u5f97\u81ea\u52a8\u5f00\u59cb\u4e8b\u52a1\u6709\u70b9\u4e0d\u8212\u670d\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528onReadWrite\u6765\u5f3a\u5236\u663e\u5f0f\u542f\u52a8\u4e8b\u52a1\u3002<\/p>\n
gremlin<\/span>><\/span> graph<\/span>.<\/span>tx<\/span>().<\/span>onReadWrite<\/span>(<\/span>Transaction<\/span>.<\/span>READ_WRITE_BEHAVIOR<\/span>.<\/span>MANUAL<\/span>)<\/span>\r\n==><\/span>org<\/span>.<\/span>janusgraph<\/span>.<\/span>graphdb<\/span>.<\/span>tinkerpop<\/span>.<\/span>JanusGraphBlueprintsGraph<\/span>$GraphTransaction<\/span>@e886caf<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>addV<\/span>(<\/span>\"person\"<\/span>).<\/span>iterate<\/span>()<\/span>\r\nOpen<\/span> a<\/span> transaction<\/span> before<\/span> attempting<\/span> to<\/span> read<\/span>\/<\/span>write<\/span> the<\/span> transaction<\/span>\r\nType<\/span> ':help'<\/span> or<\/span> ':h'<\/span> for<\/span> help<\/span>.<\/span>\r\nDisplay<\/span> stack<\/span> trace<\/span>?<\/span> [<\/span>yN<\/span>]<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>tx<\/span>().<\/span>open<\/span>()<\/span>\r\n==><\/span>null<\/span>\r\ngremlin<\/span>><\/span> g<\/span>.<\/span>addV<\/span>(<\/span>\"person\"<\/span>).<\/span>iterate<\/span>()<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u5c06onReadWrite\u8bbe\u7f6e\u4e3aMANUAL\u6765\u9632\u6b62\u81ea\u52a8\u542f\u52a8\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e3aAUTO\u3002<\/p>\n
\u591a\u7ebf\u7a0b\u4e8b\u52a1<\/h2>\n
\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e2d\u5171\u4eab\u4e00\u4e2a\u4e8b\u52a1<\/h3>\n
\u4f7f\u7528createThreadedTx()\u65b9\u6cd5\u3002\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u751f\u6210\u4e8b\u52a1\uff0c\u5e76\u5c06\u5176\u5f15\u7528\u4f20\u9012\u7ed9\u5404\u4e2a\u7ebf\u7a0b\u3002\u7b49\u6240\u6709\u7ebf\u7a0b\u7684\u5904\u7406\u5b8c\u6210\u540e\u6267\u884ccommit\u6216rollback\u64cd\u4f5c\u3002<\/p>\n
\u7528Java\u7684\u7a0b\u5e8f\u6765\u4e3e\u4f8b\u5b50\u3002<\/p>\n
class<\/span> AddVertexThread<\/span> extends<\/span> Thread<\/span>\r\n{<\/span>\r\n    private<\/span> Graph<\/span> gx<\/span>;<\/span>\r\n    private<\/span> String<\/span> name<\/span>;<\/span>\r\n\r\n    public<\/span> AddVertexThread<\/span>(<\/span>Graph<\/span> gx<\/span>,<\/span> String<\/span> name<\/span>)<\/span>\r\n    {<\/span>\r\n        this<\/span>.<\/span>gx<\/span> =<\/span> gx<\/span>;<\/span>\r\n        this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> run<\/span>()<\/span>\r\n    {<\/span>\r\n        GraphTraversalSource<\/span> g<\/span> =<\/span> this<\/span>.<\/span>gx<\/span>.<\/span>traversal<\/span>();<\/span>\r\n        g<\/span>.<\/span>addV<\/span>(<\/span>\"person\"<\/span>).<\/span>property<\/span>(<\/span>\"name\"<\/span>,<\/span> this<\/span>.<\/span>name<\/span>).<\/span>iterate<\/span>();<\/span>        \r\n    }<\/span>\r\n}<\/span>\r\n\r\npublic<\/span> class<\/span> JanusExample<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span> args<\/span>[])<\/span>\r\n    {<\/span>\r\n        Graph<\/span> graph<\/span> =<\/span> JanusGraphFactory<\/span>.<\/span>open<\/span>(<\/span>\"conf\/embedded.properties\"<\/span>);<\/span>\r\n        GraphTraversalSource<\/span> g<\/span> =<\/span> graph<\/span>.<\/span>traversal<\/span>();<\/span>\r\n        \/\/ \u30b0\u30e9\u30d5\u3092\u7a7a\u306b\u3059\u308b<\/span>\r\n        g<\/span>.<\/span>V<\/span>().<\/span>drop<\/span>().<\/span>iterate<\/span>();<\/span>\r\n        \/\/ \u30b3\u30df\u30c3\u30c8<\/span>\r\n        g<\/span>.<\/span>tx<\/span>().<\/span>commit<\/span>();<\/span>\r\n\r\n        \/\/ \u540d\u524d1\u3064\u306b\u5bfe\u3057\u3001\u305d\u308c\u305e\u308c\u5225\u306e\u30b9\u30ec\u30c3\u30c9\u3067\u9802\u70b9\u3092\u767b\u9332\u3059\u308b<\/span>\r\n        String<\/span> names<\/span>[]<\/span> =<\/span> {<\/span>\"bob\"<\/span>,<\/span> \"alice\"<\/span>,<\/span> \"ellie\"<\/span>};<\/span>\r\n        List<\/span><<\/span>Thread<\/span>><\/span> threads<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>Thread<\/span>>();<\/span>\r\n        Graph<\/span> gx<\/span> =<\/span> graph<\/span>.<\/span>tx<\/span>().<\/span>createThreadedTx<\/span>();<\/span>  \/\/ \u5171\u6709\u3055\u308c\u308b\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/span>\r\n        for<\/span>(<\/span>String<\/span> name<\/span> :<\/span> names<\/span>){<\/span>\r\n            Thread<\/span> t<\/span> =<\/span> new<\/span> AddVertexThread<\/span>(<\/span>gx<\/span>,<\/span> name<\/span>);<\/span>\r\n            threads<\/span>.<\/span>add<\/span>(<\/span>t<\/span>);<\/span>\r\n        }<\/span>\r\n        for<\/span>(<\/span>Thread<\/span> t<\/span> :<\/span> threads<\/span>)<\/span> t<\/span>.<\/span>start<\/span>();<\/span>  \/\/ \u5168\u30b9\u30ec\u30c3\u30c9\u958b\u59cb<\/span>\r\n        for<\/span>(<\/span>Thread<\/span> t<\/span> :<\/span> threads<\/span>)<\/span> t<\/span>.<\/span>join<\/span>();<\/span>  \/\/ \u5168\u30b9\u30ec\u30c3\u30c9\u5b8c\u4e86\u5f85\u3061<\/span>\r\n        gx<\/span>.<\/span>tx<\/span>().<\/span>commit<\/span>();<\/span>  \/\/ \u307e\u3068\u3081\u3066\u30b3\u30df\u30c3\u30c8<\/span>\r\n\r\n        \/\/ \u7d50\u679c\u3092\u78ba\u8a8d<\/span>\r\n        List<\/span><<\/span>Object<\/span>><\/span> result_names<\/span> =<\/span> g<\/span>.<\/span>V<\/span>().<\/span>values<\/span>(<\/span>\"name\"<\/span>).<\/span>toList<\/span>();<\/span>\r\n        for<\/span>(<\/span>Object<\/span> obj_name<\/span> :<\/span> result_names<\/span>){<\/span>\r\n            String<\/span> name<\/span> =<\/span> (<\/span>String<\/span>)<\/span>obj_name<\/span>;<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>name<\/span>);<\/span>\r\n        }<\/span>\r\n\r\n        graph<\/span>.<\/span>close<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
The result is…<\/p>\n
bob\r\nalice\r\nellie\r\n<\/code><\/pre>\n
\u5728\u4e2d\u6587\u4e2d\u62c6\u5206\uff1a\u300c\u3068\u306a\u308b(\u767b\u9332\u306e\u9806\u756a\u306f\u4fdd\u8a3c\u3055\u308c\u306a\u3044)\u300d\u3002<\/p>\n
\u53ef\u80fd\u7684\u7ffb\u8bd1\uff1a\u300c\u5e76\u4e14\u5c06\u662f\u8fd9\u6837\uff08\u6ce8\u518c\u987a\u5e8f\u4e0d\u4fdd\u8bc1\uff09\u300d\u3002<\/p>\n
\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e2d\u5904\u7406\u591a\u4e2a\u4e8b\u52a1\u3002<\/h3>\n
\u5728\u6211\u8c03\u67e5\u7684\u60c5\u51b5\u4e0b\uff0c\u6ca1\u6709\u627e\u5230\u8fd9\u79cd\u65b9\u6cd5\u3002\u5b9e\u9645\u5c1d\u8bd5\u4e5f\u4e0d\u884c\u3002<\/p>\n
Could not commit transaction due to exception during persistence\r\n<\/code><\/pre>\n
\u7531\u4e8e\u51fa\u73b0\u4e86\u8fd9\u4e2a\u9519\u8bef\uff0c\u6240\u4ee5\u65e0\u6cd5\u6b63\u5e38\u5de5\u4f5c\u3002\u4f7f\u7528\u7c7b\u4f3cConcurrentLinkedQueue\u7684\u961f\u5217\uff0c\u5728\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u4f9d\u6b21\u5904\u7406\u4e8b\u52a1\u4f3c\u4e4e\u662f\u4e00\u4e2a\u53ef\u884c\u7684\u9009\u62e9\u3002<\/p>\n
\u5982\u679c\u6709\u4efb\u4f55\u80fd\u591f\u6210\u529f\u7684\u65b9\u6cd5\uff0c\u8bf7\u544a\u8bc9\u6211\u3002<\/p>\n
\u53ea\u80fd\u8fdb\u884c\u8bfb\u53d6\u7684\u4ea4\u6613<\/h2>\n
\u5982\u679c\u4f60\u60f3\u8981\u9632\u6b62\u610f\u5916\u5730\u8986\u5199\u6570\u636e\u6216\u8005\u7834\u574f\u6570\u636e\uff0c\u6709\u65f6\u5019\u4f60\u53ef\u80fd\u9700\u8981\u8fdb\u884c\u9650\u5236\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 JanusGraph.buildTransaction()\u3002<\/p>\n
\u7531\u4e8e\u5b9e\u9645\u4e0a\u65e0\u6cd5\u76f4\u63a5\u5b9e\u4f8b\u5316JanusGraph\uff0c\u56e0\u6b64\u9700\u8981\u901a\u8fc7\u6267\u884cJanusGraphFactory.open()\u540e\u83b7\u53d6\u7684\u56fe\uff08StandardJanusGraph\uff09\u8fdb\u884c\u4f7f\u7528\u3002\u7531\u4e8eStandardJanusGraph\u662fJanusGraph\u7684\u5b50\u7c7b\uff0c\u6240\u4ee5\u53ef\u4ee5\u4f7f\u7528buildTransaction\u65b9\u6cd5\u3002\u5728Java\u4e2d\uff0c\u9700\u8981\u5c06open\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u8fdb\u884c\u5411\u4e0b\u8f6c\u578b\u540e\u518d\u4f7f\u7528\u3002<\/p>\n
gremlin<\/span>><\/span> graph<\/span> =<\/span> JanusGraphFactory<\/span>.<\/span>open<\/span>(<\/span>\"conf\/janusgraph-berkeleyje.properties\"<\/span>)<\/span>\r\n==><\/span>standardjanusgraph<\/span>[<\/span>berkeleyje:C:<\/span>\\<\/span>******<\/span>\\<\/span>janusgraph<\/span>-<\/span>0.5<\/span>.<\/span>1<\/span>\\<\/span>conf<\/span>\\<\/span>..<\/span>\/db\/<\/span>berkeley<\/span>]<\/span>\r\ngremlin<\/span>><\/span> readonly_graph<\/span> =<\/span> graph<\/span>.<\/span>buildTransaction<\/span>().<\/span>readOnly<\/span>().<\/span>start<\/span>()<\/span>\r\n==><\/span>standardjanusgraphtx<\/span>[<\/span>0x1e12a5a6<\/span>]<\/span>  \/\/ \u8aad\u307f\u53d6\u308a\u5c02\u7528\u30b0\u30e9\u30d5<\/span>\r\ngremlin<\/span>><\/span> readonly_graph<\/span>.<\/span>addVertex<\/span>(<\/span>\"person\"<\/span>)<\/span>\r\nCannot<\/span> create<\/span> new<\/span> entities<\/span> in<\/span> read<\/span>-<\/span>only<\/span> transaction<\/span>\r\nType<\/span> ':help'<\/span> or<\/span> ':h'<\/span> for<\/span> help<\/span>.<\/span>\r\nDisplay<\/span> stack<\/span> trace<\/span>?<\/span> [<\/span>yN<\/span>]<\/span>\r\ngremlin<\/span>><\/span> ro_g<\/span> =<\/span> ro_tx<\/span>.<\/span>traversal<\/span>()<\/span>  \/\/ \u8aad\u307f\u53d6\u308a\u5c02\u7528\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb<\/span>\r\n==><\/span>graphtraversalsource<\/span>[<\/span>standardjanusgraphtx<\/span>[<\/span>0x1e12a5a6<\/span>],<\/span> standard<\/span>]<\/span>\r\ngremlin<\/span>><\/span> ro_g<\/span>.<\/span>addV<\/span>(<\/span>\"person\"<\/span>)<\/span>\r\nCannot<\/span> create<\/span> new<\/span> entities<\/span> in<\/span> read<\/span>-<\/span>only<\/span> transaction<\/span>\r\nType<\/span> ':help'<\/span> or<\/span> ':h'<\/span> for<\/span> help<\/span>.<\/span>\r\nDisplay<\/span> stack<\/span> trace<\/span>?<\/span> [<\/span>yN<\/span>]<\/span>\r\n<\/code><\/pre>\n
\u5f53\u524d\u6b63\u5728\u8fdb\u884c\u7684\u4ea4\u6613\u5217\u8868<\/h2>\n
\u4f7f\u7528getOpenTransactions()\u65b9\u6cd5\u3002\u5982\u679c\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u4e8b\u52a1\u4ecd\u7136\u5904\u4e8e\u6253\u5f00\u72b6\u6001\uff0c\u53ef\u4ee5\u4f7f\u7528closeTransaction()\u65b9\u6cd5\u5f3a\u5236\u5173\u95ed\u5b83\u3002<\/p>\n
gremlin<\/span>><\/span> tx<\/span> =<\/span> graph<\/span>.<\/span>tx<\/span>().<\/span>createThreadedTx<\/span>()<\/span>\r\n==><\/span>standardjanusgraphtx<\/span>[<\/span>0x13213f26<\/span>]<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>getOpenTransactions<\/span>()<\/span>\r\n==><\/span>standardjanusgraphtx<\/span>[<\/span>0x13213f26<\/span>]<\/span>\r\n\r\n\/\/ 1\u3064\u3060\u3051\u9589\u3058\u305f\u3044\u5834\u5408\u306f<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>closeTransaction<\/span>(<\/span>graph<\/span>.<\/span>getOpenTransactions<\/span>().<\/span>get<\/span>(<\/span>0<\/span>))<\/span>  \/\/ 0\u756a\u76ee\u3092\u9589\u3058\u308b<\/span>\r\n\/\/ \u5168\u90e8\u9589\u3058\u305f\u3044\u5834\u5408\u306f<\/span>\r\ngremlin<\/span>><\/span> graph<\/span>.<\/span>getOpenTransactions<\/span>().<\/span>forEach<\/span> {<\/span> tx<\/span> -><\/span> graph<\/span>.<\/span>closeTransaction<\/span>(<\/span>tx<\/span>)<\/span> }<\/span>\r\n<\/code><\/pre>\n
\u5173\u4e8e\u9178\u7684\u95ee\u9898<\/h2>\n
\u6839\u636e\u5b98\u65b9\u6587\u4ef6\uff0c\u53ef\u4ee5\u4e86\u89e3\u5230\u4e8b\u52a1\u5728ACID\u65b9\u9762\u7684\u652f\u6301\u7a0b\u5ea6\u3002<\/p>\n
JanusGraph \u7684\u4e8b\u52a1\u5e76\u4e0d\u603b\u662f\u7b26\u5408 ACID\u3002\u5c3d\u7ba1 BerkeleyDB \u4e2d\u662f\u8fd9\u6837\u8bbe\u8ba1\u7684\uff0c\u4f46\u662f\u5728\u5e95\u5c42\u5b58\u50a8\u7cfb\u7edf Cassandra \u6216 HBase \u8fd9\u6837\u4e0d\u63d0\u4f9b\u53ef\u4e32\u884c\u5316\u9694\u79bb\u6027\u548c\u591a\u884c\u539f\u5b50\u5199\u5165\u7684\u60c5\u51b5\u4e0b\uff0c\u5e76\u4e0d\u6ee1\u8db3 ACID\u3002<\/p><\/blockquote>\n
\u6240\u4ee5\uff0cBerkeleyDB\u662f\u5426\u517c\u5bb9\uff1f\u5b9e\u9645\u4e0a\u6211\u4e0d\u77e5\u9053\uff0c\u5982\u679c\u62c5\u5fc3\u7684\u8bdd\u6700\u597d\u81ea\u884c\u9a8c\u8bc1\u4e00\u4e0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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