Gateway Service - Revision history

Ndp: /* ProtoType Encoding */

2011-01-29T03:55:32Z

ProtoType Encoding

← Older revision		Revision as of 03:55, 29 January 2011
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	There are many ways to encode something in this context.		There are many ways to encode something in this context.

	===~~ProtoType~~ Encoding ===		===Prototype Encoding ===

	As a prototype encoding we'll use an hex ascii encoding. In this encoding each character in the data source URL is expressed as is hexadecimal value using ascii characters.		As a prototype encoding we'll use an hex ascii encoding. In this encoding each character in the data source URL is expressed as is hexadecimal value using ascii characters.

Ndp: /* Overview */

2011-01-29T03:55:09Z

Overview

← Older revision		Revision as of 03:55, 29 January 2011
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	[[Image:Gateway service.jpg\|left\|thumb]]		[[Image:Gateway service.jpg\|left\|thumb]]

	The Gateway Service provides Hyrax with the ability to apply DAP constraint expressions and server side functions to data available through any network URL. This is accomplished by encoding the data source ~~URLs~~ into the request URL supplied to the gateway_service. The gateway_service decodes the URL and uses the BES to to retrieve the remote data resource and transmit the appropriate DAP response back to the client. The system employs a white list to control what data systems the BES will access.		The Gateway Service provides Hyrax with the ability to apply DAP constraint expressions and server side functions to data available through any network URL. This is accomplished by encoding the data source URL into the DAP request URL supplied to the gateway_service. The gateway_service decodes the URL and uses the BES to to retrieve the remote data resource and transmit the appropriate DAP response back to the client. The system employs a white list to control what data systems the BES will access.

Ndp: /* ProtoType Encoding */

2011-01-28T20:46:19Z

ProtoType Encoding

← Older revision		Revision as of 20:46, 28 January 2011
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	===ProtoType Encoding ===		===ProtoType Encoding ===

	As a prototype encoding we'll use a hex ascii encoding. In this encoding each character in the data source URL is expressed as is hexadecimal value using ascii characters.		As a prototype encoding we'll use an hex ascii encoding. In this encoding each character in the data source URL is expressed as is hexadecimal value using ascii characters.

	Here is [http://www.opendap.org/pub/gateway_service/hexEncoder.tgz hexEncoder.tgz] ([http://www.opendap.org/pub/gateway_service/hexEncoder.tgz.sig sig]), a gzipped tar file containing a java application can perform the encoding and decoding duties from the command line. Give it a whirl - it's a java application in a jar file. There is a bash script (hexEncode) that should launch it.		Here is [http://www.opendap.org/pub/gateway_service/hexEncoder.tgz hexEncoder.tgz] ([http://www.opendap.org/pub/gateway_service/hexEncoder.tgz.sig sig]), a gzipped tar file containing a java application can perform the encoding and decoding duties from the command line. Give it a whirl - it's a java application in a jar file. There is a bash script (hexEncode) that should launch it.

Ndp: /* Example 2 */

2011-01-28T20:45:21Z

Example 2

← Older revision		Revision as of 20:45, 28 January 2011
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	;stringToHex():		;stringToHex():
	\|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

	;hexToString(stringToHex(): http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor		;hexToString(stringToHex(): http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor

Ndp: /* Example 2 */

2011-01-28T20:45:12Z

Example 2

@@ Line 61: / Line 61: @@
 ;stringToHex():
 |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
 ;hexToString(stringToHex(): http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor

Ndp: /* Example 2 */

2011-01-28T20:44:39Z

Example 2

← Older revision		Revision as of 20:44, 28 January 2011
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	{\|		{\|
	\|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		\|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
			\|-
	\| That's big string		\| That's big string
			\|}
			{\|
			\|http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor
			\|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
			\|-
			\|Bread
			\|Pie
			\|-
			\|Butter
			\|Ice cream
	\|}		\|}

Ndp: /* Example 2 */

2011-01-28T20:42:59Z

Example 2

← Older revision		Revision as of 20:42, 28 January 2011
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	====Example 2 ====		====Example 2 ====

	;~~source~~ string: http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor		;Source string: http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor

	;stringToHex(): ~~<tt>~~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~~</tt>~~		;stringToHex():
			{\|
			\|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
			\| That's big string
			\|}

	;hexToString(stringToHex(): http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor		;hexToString(stringToHex(): http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor


	====Example 3 ====		====Example 3 ====

Ndp: /* ProtoType Encoding */

2011-01-28T20:38:37Z

ProtoType Encoding

← Older revision		Revision as of 20:38, 28 January 2011
Line 42:		Line 42:
	As a prototype encoding we'll use a hex ascii encoding. In this encoding each character in the data source URL is expressed as is hexadecimal value using ascii characters.		As a prototype encoding we'll use a hex ascii encoding. In this encoding each character in the data source URL is expressed as is hexadecimal value using ascii characters.

	~~I am attaching~~ a tar file ~~that contains an~~ application ~~for~~ encoding and decoding ~~this URL content~~. Give it a whirl - it's a java application in a jar file. There is a bash script (hexEncode) that should launch it.		Here is [http://www.opendap.org/pub/gateway_service/hexEncoder.tgz hexEncoder.tgz] ([http://www.opendap.org/pub/gateway_service/hexEncoder.tgz.sig sig]), a gzipped tar file containing a java application can perform the encoding and decoding duties from the command line. Give it a whirl - it's a java application in a jar file. There is a bash script (hexEncode) that should launch it.

	The source code for a java ~~implementation of the prototype encoding~~ is available here: http://scm.opendap.org/svn/trunk/olfs/src/opendap/gateway/EncodeDecode.java		The source code for the EncodeDecode java class used by hexEncode is available here: http://scm.opendap.org/svn/trunk/olfs/src/opendap/gateway/EncodeDecode.java


Line 60:		Line 60:
	;source string: http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor		;source string: http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor

	;stringToHex(): 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		;stringToHex(): <tt>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</tt>

	;hexToString(stringToHex(): http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor		;hexToString(stringToHex(): http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?service=WCS&version=1.0.0&request=GetCoverage&coverage=H2OMMRStd&crs=WGS84&bbox=-107.375000,51.625000,-102.625000,56.375000&format=netCDF&TIME=2002-10-03&resx=0.25&resy=0.25&interpolationMethod=Nearest%20neighbor

Ndp: /* ProtoType Encoding */

2011-01-28T20:12:29Z

ProtoType Encoding

@@ Line 41: / Line 41: @@
 As a prototype encoding we'll use a hex ascii encoding. In this encoding each character in the data source URL is expressed as is hexadecimal value using ascii characters.
 ====Example 1 ====
@@ Line 67: / Line 72: @@
 ;hexToString(stringToHex(): foobar

Ndp: /* Example 3 */

2011-01-28T20:12:01Z

Example 3

← Older revision		Revision as of 20:12, 28 January 2011
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	I am attaching a tar file that contains an application for encoding and decoding this URL content. Give it a whirl - it's a java application in a jar file. There is a bash script (hexEncode) that should launch it.		I am attaching a tar file that contains an application for encoding and decoding this URL content. Give it a whirl - it's a java application in a jar file. There is a bash script (hexEncode) that should launch it.

	The source code for a java implementation of the prototype encoding is available here:		The source code for a java implementation of the prototype encoding is available here: http://scm.opendap.org/svn/trunk/olfs/src/opendap/gateway/EncodeDecode.java

	http://scm.opendap.org/svn/trunk/olfs/src/opendap/gateway/EncodeDecode.java