Java Neo4j非托管扩展和GuardTimeoutException

对于我在Java中构建的Neo4j非托管扩展遇到的问题，我非常需要一些建议。我创建了一个非常简单的代码示例，突出了我的问题。基本前提是我想设定

org.neo4j.server.webserver.limit.executiontime

---

对于neo4j服务器来说，用户查询需要合理的时间（比如说2分钟），这些查询是通过Cypher、其他端点等进入的。但是我还有一些批处理作业需要通过这个非托管扩展运行，因此，我尝试将它们分成几个小事务，使其运行得更慢，因为每个事务都必须刷新到磁盘。 通常，在一次发送中添加多达50k个节点是有意义的，这应该不到一秒钟

对于您的guard筛选器，它只是一个servlet筛选器，因此您也可以检查安装它的Neo4j源代码，并在扩展的init上自己安装它，但不包括要批处理到的端点

在：

org.neo4j.server.AbstractNeoServer

第488行

    Filter filter = new GuardingRequestFilter( guard,
            getConfiguration().getInt( Configurator.WEBSERVER_LIMIT_EXECUTION_TIME_PROPERTY_KEY ) );
    webServer.addFilter( filter, "/*" );

您可以使用扩展初始值设定项添加自定义筛选器，如下所示：

您必须添加这样一个包含初始值设定项类名的文件：

---

迈克尔·霍恩（Michael Hunger）发布的解决方案非常有效，我自己也有一些学习要点

我必须将neo4j-server.properties中的org.neo4j.server.thirdparty_jaxrs_classes属性更新到更根目录，因为我没有将我的初始值设定项与api java文件放在同一目录中

start（）方法必须返回一个空集合

我能够使用几个不同的过滤器为不同的端点指定时间限制

最终代码如下：

@Override
public Collection<Injectable<?>> start(final NeoServer neoServer) {
    webServer = getWebServer(neoServer);
    final Database database = neoServer.getDatabase();
    final GraphDatabaseAPI graphDatabaseAPI = database.getGraph();
    final Guard guard = graphDatabaseAPI.getDependencyResolver().resolveDependency(Guard.class);
    final Filter filter = new GuardingRequestFilter(guard, 600);
    webServer.addFilter(filter, "/*" );
    final Filter filter2 = new GuardingRequestFilter(guard, 3000);
    webServer.addFilter(filter2, "*/batch" );
    return Collections.emptyList();
}

@覆盖
公众收藏谢谢Michael，我会尝试一下这个配置，并发布一个关于我的结果的后续报道！我遵循了您建议的步骤—我有一个新的java类，它扩展了SPIPluginLifecycle，并在/src/main/resources/META-INF/services中添加了新的配置文件。但是，我根本没有看到调用这个初始化类。这是我在启动时看到的日志。请在上面的问题中查看我的结果中添加的更多详细信息！
org.neo4j.kernel.guard.GuardTimeoutException: timeout occured (overtime=1)
at org.neo4j.kernel.guard.Guard$Timeout.check(Guard.java:132)
at org.neo4j.kernel.guard.Guard.check(Guard.java:43)
at org.neo4j.kernel.InternalAbstractGraphDatabase$5.createNode(InternalAbstractGraphDatabase.java:794)
at org.neo4j.kernel.impl.api.state.OldTxStateBridgeImpl.nodeCreate(OldTxStateBridgeImpl.java:120)
at org.neo4j.kernel.impl.api.state.TxStateImpl.nodeDoCreate(TxStateImpl.java:366)
at org.neo4j.kernel.impl.api.StateHandlingStatementOperations.nodeCreate(StateHandlingStatementOperations.java:99)
at org.neo4j.kernel.impl.api.ConstraintEnforcingEntityOperations.nodeCreate(ConstraintEnforcingEntityOperations.java:390)
at org.neo4j.kernel.impl.api.LockingStatementOperations.nodeCreate(LockingStatementOperations.java:207)
at org.neo4j.kernel.impl.api.OperationsFacade.nodeCreate(OperationsFacade.java:506)
at org.neo4j.kernel.InternalAbstractGraphDatabase.createNode(InternalAbstractGraphDatabase.java:1120)
at **TestFile.test(TestFile.java:15)
at **test(Jobs.java:48)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at org.neo4j.server.rest.transactional.TransactionalRequestDispatcher.dispatch(TransactionalRequestDispatcher.java:139)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:698)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1506)
at org.neo4j.server.guard.GuardingRequestFilter.doFilter(GuardingRequestFilter.java:68)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1477)
at org.neo4j.server.guard.GuardingRequestFilter.doFilter(GuardingRequestFilter.java:68)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1477)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:211)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1096)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:432)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1030)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:445)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:268)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:229)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:601)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:532)
at java.lang.Thread.run(Thread.java:744)

public class GraphInitializer implements SPIPluginLifecycle {
private WebServer webServer;

@Override
public Collection<Injectable<?>> start(final GraphDatabaseService graphDatabaseService, final Configuration config) {
    throw new IllegalAccessError();
}

@Override
public void stop() {

}

@Override
public Collection<Injectable<?>> start(final NeoServer neoServer) {
    System.out.println("K starting!");
    webServer = getWebServer(neoServer);
    final Database database = neoServer.getDatabase();
    final GraphDatabaseAPI graphDatabaseAPI = database.getGraph();
    final Guard guard = graphDatabaseAPI.getDependencyResolver().resolveDependency(Guard.class);
    final Filter filter = new GuardingRequestFilter(guard, 3000);
    webServer.addFilter(filter, "/*" );
    return null;
}

private WebServer getWebServer(final NeoServer neoServer) {
    if (neoServer instanceof AbstractNeoServer) {
        return ((AbstractNeoServer) neoServer).getWebServer();
    }
    throw new IllegalArgumentException("expected AbstractNeoServer");
}

2014-10-06 16:14:23.009+0000 INFO  [API] Mounted discovery module at [/]
2014-10-06 16:14:23.014+0000 INFO  [API] Mounted REST API at [/db/data/]
2014-10-06 16:14:23.017+0000 INFO  [API] Mounted management API at [/db/manage/]
2014-10-06 16:14:23.017+0000 INFO  [API] Mounted third-party JAX-RS package [***] at [/kristen]
2014-10-06 16:14:23.017+0000 INFO  [API] Mounted webadmin at [/webadmin]
2014-10-06 16:14:23.017+0000 INFO  [API] Mounted Neo4j Browser at [/browser]
2014-10-06 16:14:23.070+0000 INFO  [API] Mounting static content at [/webadmin] from [webadmin-html]
2014-10-06 16:14:23.124+0000 INFO  [API] Mounting static content at [/browser] from [browser]
12:14:23.126 [main] WARN  o.e.j.server.handler.ContextHandler - o.e.j.s.ServletContextHandler@1cb1c025{/,null,null} contextPath ends with /
12:14:23.127 [main] WARN  o.e.j.server.handler.ContextHandler - Empty contextPath
12:14:23.131 [main] INFO  org.eclipse.jetty.server.Server - jetty-9.0.5.v20130815
12:14:23.155 [main] INFO  o.e.j.server.handler.ContextHandler - Started o.e.j.s.h.MovedContextHandler@5de15910{/,null,AVAILABLE}
12:14:23.245 [main] INFO  o.e.j.w.StandardDescriptorProcessor - NO JSP Support for /webadmin, did not find org.apache.jasper.servlet.JspServlet
12:14:23.255 [main] INFO  o.e.j.server.handler.ContextHandler - Started o.e.j.w.WebAppContext@4b45c74e{/webadmin,jar:file:/usr/local/Cellar/neo4j/2.1.3/libexec/system/lib/neo4j-server-2.1.3-static-web.jar!/webadmin-html,AVAILABLE}
12:14:23.668 [main] INFO  o.e.j.server.handler.ContextHandler - Started o.e.j.s.ServletContextHandler@2917eb65{/kristen,null,AVAILABLE}
12:14:23.817 [main] INFO  o.e.j.server.handler.ContextHandler - Started o.e.j.s.ServletContextHandler@54589209{/db/manage,null,AVAILABLE}
12:14:24.003 [main] INFO  o.e.j.server.handler.ContextHandler - Started o.e.j.s.ServletContextHandler@68a1f8e7{/db/data,null,AVAILABLE}
12:14:24.021 [main] INFO  o.e.j.w.StandardDescriptorProcessor - NO JSP Support for /browser, did not find org.apache.jasper.servlet.JspServlet
12:14:24.022 [main] INFO  o.e.j.server.handler.ContextHandler - Started o.e.j.w.WebAppContext@438e0daa{/browser,jar:file:/usr/local/Cellar/neo4j/2.1.3/libexec/system/lib/neo4j-browser-2.1.3.jar!/browser,AVAILABLE}
12:14:24.103 [main] INFO  o.e.j.server.handler.ContextHandler - Started o.e.j.s.ServletContextHandler@1cb1c025{/,null,AVAILABLE}
12:14:24.115 [main] INFO  o.e.jetty.server.ServerConnector - Started ServerConnector@75b61dd7{HTTP/1.1}{localhost:7474}
12:14:24.503 [main] INFO  o.e.jetty.server.ServerConnector - Started ServerConnector@6464d61f{SSL-HTTP/1.1}{localhost:7473}
2014-10-06 16:14:24.503+0000 INFO  [API] Server started on: http://localhost:7474/
2014-10-06 16:14:24.504+0000 INFO  [API] Remote interface ready and available at [http://localhost:7474/]

    Filter filter = new GuardingRequestFilter( guard,
            getConfiguration().getInt( Configurator.WEBSERVER_LIMIT_EXECUTION_TIME_PROPERTY_KEY ) );
    webServer.addFilter( filter, "/*" );

@Override
public Collection<Injectable<?>> start(final NeoServer neoServer) {
    webServer = getWebServer(neoServer);
    final Database database = neoServer.getDatabase();
    final GraphDatabaseAPI graphDatabaseAPI = database.getGraph();
    final Guard guard = graphDatabaseAPI.getDependencyResolver().resolveDependency(Guard.class);
    final Filter filter = new GuardingRequestFilter(guard, 600);
    webServer.addFilter(filter, "/*" );
    final Filter filter2 = new GuardingRequestFilter(guard, 3000);
    webServer.addFilter(filter2, "*/batch" );
    return Collections.emptyList();
}