App Engine的全文搜索API（Java）

时间：2012-06-01 18:44:23

标签： java google-app-engine full-text-search

我一直在尝试将实验性搜索API用于Google AppEngine。我使用的是SDK 1.6.6。 到目前为止，我可以在索引中添加条目并在我的开发环境中进行搜索。 当我部署我的应用程序时，我仍然可以向索引添加条目，但是当我尝试时 执行搜索，我得到以下异常日志：

br.com.qmagico.server.service.search.GenericSearchService search: Busca com query 'soma' falhou
com.google.appengine.api.search.SearchException: 
at com.google.appengine.api.search.IndexImpl$3.convertException(IndexImpl.java:268)
at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:106)
at com.google.appengine.api.search.FutureHelper.getInternal(FutureHelper.java:74)
at com.google.appengine.api.search.FutureHelper.quietGet(FutureHelper.java:33)
at com.google.appengine.api.search.IndexImpl.search(IndexImpl.java:390)
at br.com.qmagico.server.service.search.GenericSearchService.search(GenericSearchService.java:109)
at br.com.qmagico.server.service.search.AulaSearchService.search(AulaSearchService.java:50)
at br.com.qmagico.server.handler.GetAulasHandler.executeLoggedException(GetAulasHandler.java:45)
at br.com.qmagico.server.handler.GetAulasHandler.executeLoggedException(GetAulasHandler.java:1)
at br.com.qmagico.server.QmActionHandler.execute(QmActionHandler.java:23)
at com.gwtplatform.dispatch.server.AbstractDispatchImpl.doExecute(AbstractDispatchImpl.java:153)
at com.gwtplatform.dispatch.server.AbstractDispatchImpl.execute(AbstractDispatchImpl.java:111)
at com.gwtplatform.dispatch.server.AbstractDispatchServiceImpl.execute(AbstractDispatchServiceImpl.java:81)
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:616)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:165)
at java.security.AccessController.doPrivileged(Native Method)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:163)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:124)
at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:43)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:249)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:477)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
at java.lang.Thread.run(Thread.java:679)

执行此搜索的代码是：

public List<Long> search(Index index, String queryStr, String sortField) {
    ArrayList<Long> ids = new ArrayList<Long>();
    if (queryStr != null && !queryStr.isEmpty()) {
        int limit = 5;
        try {
            QueryOptions.Builder builder = QueryOptions.newBuilder().setLimit(limit);
            if (sortField != null) {
                builder = builder.setSortOptions(SortOptions.newBuilder()
                    .addSortExpression(SortExpression.newBuilder()
                        .setExpression(sortField)
                        .setDefaultValue("")
                        .setDirection(SortExpression.SortDirection.DESCENDING))
                    .build());
            }
            QueryOptions queryOptions = builder.build();

            Query query = Query.newBuilder()
                .setOptions(queryOptions)
                .build(queryStr);
            LOG.info("Enviando query " + query);
            Results<ScoredDocument> results = index.search(query);
            for (ScoredDocument scoredDoc : results) {
                ids.add(scoredDoc.getOnlyField("id").getNumber().longValue());
            }
        } catch (RuntimeException e) {
            LOG.log(Level.SEVERE, "Busca com query '" + queryStr + "' falhou", e);
        }
    }
    return ids;
}

有没有人应该做些什么来解决这个问题？

THX！

2 个答案:

答案 0 :(得分：2)

如果您认为排序是您的问题，那么您可能需要查看使用文档排名在索引中预分类文档。文档上的排名字段默认设置为自2011年1月1日以来的秒数。但是，您可以提供整数排名值。例如，如果您想按价格对产品目录进行排序（从低到高，从高到低）。排名用于预先索引索引中的文档。

public Index getIndex(String indexName) {
    IndexSpec indexSpec = IndexSpec.newBuilder().setName(indexName).build();
    return SearchServiceFactory.getSearchService().getIndex(indexSpec);
}

Document doc = Document.newBuilder()
    .addField(Field.newBuilder().setName('name').setText("some text"))
    .setRank(functionToGetPrice())
    .build();

getIndex("productHighToLow").put(doc);

doc = Document.newBuilder()
    .addField(Field.newBuilder().setName('name').setText("some text"))
    .setRank(MAXINT-functionToGetPrice())
    .build();

getIndex("productLowToHigh").put(doc);

然后当您搜索索引时，如果用户选择了“价格从低到高”并查询“LED电视”，那么您只需发出类似

的查询 
getIndex("productLowToHigh").search("LED TV");

即使对于大型（产品目录）索引，它也会更快，语义更正。

答案 1 :(得分：0)

您是否尝试删除SortOptions？ 设置SortOptions时出现同样的错误。 我认为这是一个错误。

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