Ben would be more help as I am not sure how that works without a half day
to look at it :(
--
Jody Garnett
On 06/02/2012, at 6:57 PM, NORMAN MANN <[email protected]> wrote:
Thanks Jody, appreciate your help.
Could you point me in the direction of which part of the source code?
I have been looking at SchemaFactory.loadSchemas which I don't think is
what I need.
I have also been looking at app-schema-resolver which looks like more what
I need, however, I am not sure how to set this globally (if possible?).
Thanks in advance,
Norman
*From:* Jody Garnett <[email protected]>
*To:* NORMAN MANN <[email protected]>
*Cc:* "[email protected]" <
[email protected]>
*Sent:* Sunday, 5 February 2012, 10:23
*Subject:* Re: [Geotools-gt2-users] Dead lock? Or caching XMLs chemas?
You should package well known schemas as jars and contribute them into
the mix. This is used when the source of the Schema is unavailable; or
if your app is behind a fire wall. See the source code for examples of
the OGC schemas handled this way.
--
Jody Garnett
On 05/02/2012, at 5:52 PM, NORMAN MANN <[email protected]> wrote:
>
>
> Anyone?
> Any advice would really be appreciated.
>
> Especially on storing schemas locally as this may well avoid the
contention .
>
> Thanks
>
> Norman
>
> ------------------------------
> On Fri, Feb 3, 2012 3:26 PM GMT NORMAN MANN wrote:
>
>> Hi All,
>>
>> I am using geotools to generate images based on a remote WMS, and a
local WFS.
>> To increase throughput, I am attempted to make the software
multithreaded (in a non application server environment).
>> However I think I am getting deadlock (well maybe not deadlock, but the
threads seem to be stuck waiting for one of the threads waiting to download
XML schemas over the internet).
>>
>> On initial startup of WebMapServer object (each thread keeps it's own
instance of a WebMapServer for performance - downloading XML schemas in
particularly time consuming) it seems to download lots of XML schemas from
the getCapabilities document for the WMS.
>>
>> Ideally I would like to cache these on the file system, is this
possible, if so how? This may alleviate the problem in terms of time (it
seems to take a long time) taken to download the various XML schemas. But
would be preferential anyway to reduce startup time.
>>
>> Secondly each WebMapServer object seems to be waiting on a lock on
org.geotools.xml.SchemaFactory.getInstance which is locked by one of the
WebMapServer objects.
>> Does this have to be the case, or can I remove this area as a bottle
neck? Is this is a bug? I can see that SchemaFactory.getInstance seems to
be intended to be thread safe.
>>
>> I have pasted the stack of some of the example threads below, and any
help/advice would be very much appreciated!!
>>
>> Thanks
>>
>> Norman
>>
>>
>> THREAD with LOCK
>>
>> "Piper Processor 3" prio=1 tid=0x0966e9d0 nid=0x3b4f runnable
[0xe7c8f000..0xe7c90130]
>> at java.net.SocketInputStream.socketRead0(Native Method)
>> at java.net.SocketInputStream.read(SocketInputStream.java:129)
>> at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
>> at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
>> at java.io.BufferedInputStream.read(BufferedInputStream.java:313)
>> - locked <0xeabe3e70> (a java.io.BufferedInputStream)
>> at
sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:606)
>> at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:554)
>> at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:936)
>> - locked <0xeabe2480> (a
sun.net.www.protocol.http.HttpURLConnection)
>> at
org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
>> at
org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
>> at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
Source)
>> at
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:255)
>> at
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:305)
>> - locked <0xeb52acf0> (a org.geotools.xml.SchemaFactory)
>> at
org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:265)
>> - locked <0xef884168> (a java.lang.Class)
>> at
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:430)
>> at
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:117)
>> at
org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:257)
>> at
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:310)
>> - locked <0xeb52acf0> (a org.geotools.xml.SchemaFactory)
>> at
org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:265)
>> - locked <0xef884168> (a java.lang.Class)
>> at
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:385)
>> at
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:117)
>> at
org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:257)
>> at
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:310)
>> - locked <0xeb52acf0> (a org.geotools.xml.SchemaFactory)
>> at
org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:265)
>> - locked <0xef884168> (a java.lang.Class)
>> at
org.geotools.xml.handlers.xsi.SchemaHandler.compress(SchemaHandler.java:430)
>> at
org.geotools.xml.handlers.xsi.RootHandler.getSchema(RootHandler.java:117)
>> at
org.geotools.xml.XSISAXHandler.getSchema(XSISAXHandler.java:257)
>> at
org.geotools.xml.SchemaFactory.getRealInstance(SchemaFactory.java:310)
>> - locked <0xeb52acf0> (a org.geotools.xml.SchemaFactory)
>> at
org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:265)
>> - locked <0xef884168> (a java.lang.Class)
>> at
org.geotools.xml.handlers.ElementHandlerFactory.startPrefixMapping(ElementHandlerFactory.java:87)
>> at
org.geotools.xml.XMLSAXHandler.startElement(XMLSAXHandler.java:370)
>> at
org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
>> at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown
Source)
>> at
org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown
Source)
>> at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
>> at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
>> at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
Source)
>> at
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:176)
>> at
org.geotools.xml.DocumentFactory.getInstance(DocumentFactory.java:133)
>> at
org.geotools.data.wms.response.WMSGetCapabilitiesResponse.<init>(WMSGetCapabilitiesResponse.java:54)
>> at
org.geotools.data.wms.WMS1_0_0$GetCapsRequest.createResponse(WMS1_0_0.java:231)
>> at
org.geotools.data.ows.AbstractOpenWebService.internalIssueRequest(AbstractOpenWebService.java:440)
>> at
org.geotools.data.wms.WebMapServer.issueRequest(WebMapServer.java:405)
>> at
org.geotools.data.ows.AbstractOpenWebService.negotiateVersion(AbstractOpenWebService.java:240)
>> at
org.geotools.data.ows.AbstractOpenWebService.<init>(AbstractOpenWebService.java:95)
>> at
org.geotools.data.ows.AbstractOpenWebService.<init>(AbstractOpenWebService.java:81)
>> at
org.geotools.data.wms.WebMapServer.<init>(WebMapServer.java:368)
>>
>>
>> THREADS without lock....
>> "Piper Processor 2" prio=1 tid=0x0964bf50 nid=0x3b4e waiting for monitor
entry [0xe7d10000..0xe7d10fb0]
>> at
org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:265)
>> - waiting to lock <0xef884168> (a java.lang.Class)
>> at
org.geotools.xml.handlers.ElementHandlerFactory.startPrefixMapping(ElementHandlerFactory.java:87)
>> at
org.geotools.xml.XMLSAXHandler.startElement(XMLSAXHandler.java:370)
>> at
org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
>> at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown
Source)
>> at
org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown
Source)
>> at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
>> at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
>> at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
Source)
>> at
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:176)
>> at
org.geotools.xml.DocumentFactory.getInstance(DocumentFactory.java:133)
>> at
org.geotools.data.wms.response.WMSGetCapabilitiesResponse.<init>(WMSGetCapabilitiesResponse.java:54)
>> at
org.geotools.data.wms.WMS1_0_0$GetCapsRequest.createResponse(WMS1_0_0.java:231)
>> at
org.geotools.data.ows.AbstractOpenWebService.internalIssueRequest(AbstractOpenWebService.java:440)
>> at
org.geotools.data.wms.WebMapServer.issueRequest(WebMapServer.java:405)
>> at
org.geotools.data.ows.AbstractOpenWebService.negotiateVersion(AbstractOpenWebService.java:240)
>> at
org.geotools.data.ows.AbstractOpenWebService.<init>(AbstractOpenWebService.java:95)
>> at
org.geotools.data.ows.AbstractOpenWebService.<init>(AbstractOpenWebService.java:81)
>> at
org.geotools.data.wms.WebMapServer.<init>(WebMapServer.java:368)
>>
>> "Piper Processor 1" prio=1 tid=0x0964bdc8 nid=0x3b4d waiting for monitor
entry [0xe7d91000..0xe7d92030]
>> at
org.geotools.xml.SchemaFactory.getInstance(SchemaFactory.java:208)
>> - waiting to lock <0xef884168> (a java.lang.Class)
>> at
org.geotools.xml.handlers.ElementHandlerFactory.startPrefixMapping(ElementHandlerFactory.java:115)
>> at
org.geotools.xml.XMLSAXHandler.startElement(XMLSAXHandler.java:383)
>> at
org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
>> at
org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown
Source)
>> at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown
Source)
>> at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
>> at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
>> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
>> at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
Source)
>> at
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
>> at javax.xml.parsers.SAXParser.parse(SAXParser.java:176)
>> at
org.geotools.xml.DocumentFactory.getInstance(DocumentFactory.java:133)
>> at
org.geotools.data.wms.response.WMSGetCapabilitiesResponse.<init>(WMSGetCapabilitiesResponse.java:54)
>> at
org.geotools.data.wms.WMS1_0_0$GetCapsRequest.createResponse(WMS1_0_0.java:231)
>> at
org.geotools.data.ows.AbstractOpenWebService.internalIssueRequest(AbstractOpenWebService.java:440)
>> at
org.geotools.data.wms.WebMapServer.issueRequest(WebMapServer.java:405)
>> at
org.geotools.data.ows.AbstractOpenWebService.negotiateVersion(AbstractOpenWebService.java:240)
>> at
org.geotools.data.ows.AbstractOpenWebService.<init>(AbstractOpenWebService.java:95)
>> at
org.geotools.data.ows.AbstractOpenWebService.<init>(AbstractOpenWebService.java:81)
>> at
org.geotools.data.wms.WebMapServer.<init>(WebMapServer.java:368)
>> at
com.bt.mbe.processing.PIPERProcessor.getWMSLayer(PIPERProcessor.java:369)
>> at
com.bt.mbe.processing.PIPERProcessor.processItem(PIPERProcessor.java:269)
>> at
com.bt.mbe.processing.PIPERProcessor.run(PIPERProcessor.java:211)
>> at java.lang.Thread.run(Thread.java:595)
>
>
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