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Copyright 2011 Johns Hopkins University Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. JHU Turbulence Database Cluster C and Fortran Interface Library http://turbulence.pha.jhu.edu/ **** About this package **** This library provides a very simple wrapper around gSOAP for calling the JHU Turbulence Database Cluster. More information can be found at: http://turbulence.pha.jhu.edu/help/c-fortran/ 'make' will build both the Fortran and C sample code. Use 'make turbc' if you do not have a Fortran compiler installed. Note: On some platforms, you may need to use 'gmake' (GNU Make) instead. **** Identification Token (required for large queries) **** While our service is open to anyone, we would like to keep track of who is using the service, and how. To this end, we would like each user or site to obtain an authorization token from us: http://turbulence.pha.jhu.edu/help/authtoken.html If you are just experimenting, the default token included in these test files should be valid. **** Working with hdf5 cutout files **** Cutouts of data from the dataset can be downloaded in hdf5 format by visiting "http://turbulence.pha.jhu.edu/cutout.aspx". If you wish to work with hdf5 files downloaded from our cutout utility you need an hdf5 installation. In order to use the functions for computing interpolation, derivatives, etc. locally (rather than submitting queries to the Web server) you need to build the code with the option "CUTOUT_SUPPORT=1", e.g.: $ make turbc CUTOUT_SUPPORT=1 The Makefile looks for an hdf5 installation in the hdf5-1.8.9 directory in the user's local directory ("~/hdf5-1.8.9"). To specify a different installation directory change the H5DIR variable in the Makefile. Cutout files are loaded with the turblibAddLocalSource() function, which takes the filename as argument. Multiple files can be loaded (make a call to turblibAddLocalSource() for each additional file). **** Platform-specific notes **** ___Mac OS X:___ This code has been tested under Mac OS X 10.4 (Tiger), 10.5 (Leopard), 10.6 (Snow Leopard) and 10.7 (Lion). You will need the Apple Developer Tools (Xcode), which can be found on your OS X install disk, or downloaded for free (with registration) from http://developer.apple.com/ . If you wish to use fortran, you will need to install gfortran. We used both the precompiled version available from http://hpc.sourceforge.net/ or the version bundled with the R statistical package ( http://www.r-project.org/ ). ___Linux:___ Most gcc releases should work. If you wish to use fortran you will need to install gfortran, available as an optional package with most Linux distributions. ___Other:___ Please let us know if any changes are needed for the code to compile on other platforms or with different compilers. **** Error Handling **** By default, the turbulence library will print errors out to the console and abort the program. You can change this behavior by calling turblibSetExitOnError(0) before making any calls to the turbulence database. You will then be responsible for checking the return codes. ___C Example:___ turblibSetExitOnError(0); ... if (getVelocity ( ... ) != SOAP_OK) { turblibPrintError(); exit(1); } __Fortran Example:___ integer, parameter :: SOAP_OK = 0 ! From stdsoap2.h integer rc CALL turblibSetExitOnError(0) ... rc = getVelocity( ... ) if (rc.ne.SOAP_OK) then CALL turblibPrintError() STOP end if **** Handling intermittent failures **** We suggest writing long-running code to handle any intermittent network or database failures which may occur. The following sample code will try each query up to 30 times, with a delay of 1 minute between each attempt. In addition, we suggest adding checkpoints to your code to allow for the continuation after longer failures. ___C:___ int attempts = 0; turblibSetExitOnError(0); while (getVelocity ( ... ) != SOAP_OK) { if (attempts++ > 30) { printf("Fatal Error: too many failures\n"); exit(1); } else { printf("Temporary Error: %s\n", turblibGetErrorString()); } sleep(60); } ___Fortran:___ integer attempts attempts = 0 CALL turblibSetExitOnError(0) do while (getVelocity( ... ).ne.0) attempts = attempts + 1 if (attempts.ge.30) then write(*,*) 'Fatal error: too many failures' CALL turblibPrintError() STOP else write(*,*) 'Temporary Error (#', attempts, '):' CALL turblibPrintError() CALL sleep(1) end if end do $Id: README,v 1.10 2010-03-10 04:09:00 eric Exp $
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