ADQLExecutor.java 28.25 KiB
package tap;
/*
* This file is part of TAPLibrary.
*
* TAPLibrary is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* TAPLibrary is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with TAPLibrary. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2012-2015 - UDS/Centre de Données astronomiques de Strasbourg (CDS),
* Astronomisches Rechen Institut (ARI)
*/
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.http.HttpServletResponse;
import tap.data.DataReadException;
import tap.data.TableIterator;
import tap.db.DBConnection;
import tap.db.DBException;
import tap.formatter.OutputFormat;
import tap.log.TAPLog;
import tap.metadata.TAPSchema;
import tap.metadata.TAPTable;
import tap.parameters.DALIUpload;
import tap.parameters.TAPParameters;
import tap.upload.Uploader;
import uws.UWSException;
import uws.UWSToolBox;
import uws.job.JobThread;
import uws.job.Result;
import uws.service.log.UWSLog.LogLevel;
import adql.parser.ADQLParser;
import adql.parser.ADQLQueryFactory;
import adql.parser.ParseException;
import adql.query.ADQLQuery;
/**
* <p>Let process completely an ADQL query.</p>
*
* <p>Thus, this class aims to apply the following actions (in the given order):</p>
* <ol>
* <li>Upload the user tables, if any</li>
* <li>Parse the ADQL query (and so, transform it in an object tree)</li>
* <li>Execute it in the "database"</li>
* <li>Format and write the result</li>
* <li>Drop all uploaded tables from the "database"</li>
* </ol>
*
* <h3>Job execution mode</h3>
*
* <p>
* This executor is able to process queries coming from a synchronous job (the result must be written directly in the HTTP response)
* and from an asynchronous job (the result must be written, generally, in a file). Two start(...) functions let deal with
* the differences between the two job execution modes: {@link #start(AsyncThread)} for asynchronous jobs
* and {@link #start(Thread, String, TAPParameters, HttpServletResponse)} for synchronous jobs.
* </p>
*
* <h3>Input/Output formats</h3> *
* <p>Uploaded tables must be provided in VOTable format.</p>
*
* <p>
* Query results must be formatted in the format specified by the user in the job parameters. A corresponding formatter ({@link OutputFormat})
* is asked to the description of the TAP service ({@link ServiceConnection}). If none can be found, VOTable will be chosen by default.
* </p>
*
* <h3>Executor customization</h3>
*
* <p>It is totally possible to customize some parts of the ADQL query processing. However, the main algorithm must remain the same and is implemented
* by {@link #start()}. This function is final, like {@link #start(AsyncThread)} and {@link #start(Thread, String, TAPParameters, HttpServletResponse)},
* which are just preparing the execution for {@link #start()} in function of the job execution mode (asynchronous or synchronous).
* </p>
*
* <p><i>Note:
* {@link #start()} is using the Template Method Design Pattern: it defines the skeleton/algorithm of the processing, and defers some steps
* to other functions.
* </i></p>
*
* <p>
* So, you are able to customize almost all individual steps of the ADQL query processing: {@link #parseADQL()}, {@link #executeADQL(ADQLQuery)} and
* {@link #writeResult(TableIterator, OutputFormat, OutputStream)}.
* </p>
*
* <p><i>Note:
* Note that the formatting of the result is done by an OutputFormat and that the executor is just calling the appropriate function of the formatter.
* </i></p>
*
* <p>
* There is no way in this executor to customize the upload. However, it does not mean it can not be customized.
* Indeed you can do it easily by extending {@link Uploader} and by providing the new class inside your {@link TAPFactory} implementation
* (see {@link TAPFactory#createUploader(DBConnection)}).
* </p>
*
* @author Grégory Mantelet (CDS;ARI)
* @version 2.0 (04/2015)
*/
public class ADQLExecutor {
/** Description of the current TAP service. */
protected final ServiceConnection service;
/** The logger to use. */
protected final TAPLog logger;
/** The thread which is using this executor. */
protected Thread thread;
/** List of all TAP parameters needed for the query execution (and particularly the ADQL query itself). */
protected TAPParameters tapParams;
/** Description of the ADQL schema containing all the tables uploaded by the user for this specific query execution.
* <i>Note: This attribute is NULL before calling one of the start(...) function. It MAY be NULL also after if no table has been uploaded.</i> */
protected TAPSchema uploadSchema = null;
/** The HTTP response in which the query execution must be written. This attribute is NULL if the execution is asynchronous. */
protected HttpServletResponse response;
/** The execution report to fill gradually while the processing of the query.
* <i>Note: This attribute is NULL before calling one of the start(...) function, but it will never be after this call.</i> */
protected TAPExecutionReport report;
/** Connection to the "database".
* <i>Note: This attribute is NULL before and after the query processing (= call of a start(...) function).</i> */
private DBConnection dbConn = null;
/** ID of the current query processing step (uploading, parsing, execution, writing result, ...).
* <i>Note: This attribute is NULL before and after the query processing (= call of a start(...) function).</i> */
private ExecutionProgression progression = null;
/** Date/Time at which the current query processing step has started. */
private long startStep = -1;
/**
* Build an {@link ADQLExecutor}. *
* @param service The description of the TAP service.
*/
public ADQLExecutor(final ServiceConnection service){
this.service = service;
this.logger = service.getLogger();
}
/**
* Get the logger used by this executor.
*
* @return The used logger.
*/
public final TAPLog getLogger(){
return logger;
}
/**
* <p>Get the report of the query execution. It helps indicating the execution progression and the duration of each step.</p>
*
* <p><i>Note:
* Before starting the execution (= before the call of a "start(...)" function), this function will return NULL.
* It is set when the query processing starts and remains not NULL after that (even when the execution is finished).
* </i></p>
*
* @return The execution report.
*/
public final TAPExecutionReport getExecReport(){
return report;
}
/**
* <p>Get the object to use in order to write the query result in the appropriate format
* (either the asked one, or else VOTable).</p>
*
* @return The appropriate result formatter to use. <i>Can not be NULL!</i>
*
* @throws TAPException If no format corresponds to the asked one and if no default format (for VOTable) can be found.
*
* @see ServiceConnection#getOutputFormat(String)
*/
protected OutputFormat getFormatter() throws TAPException{
// Search for the corresponding formatter:
String format = tapParams.getFormat();
OutputFormat formatter = service.getOutputFormat((format == null) ? "votable" : format);
if (format != null && formatter == null)
formatter = service.getOutputFormat("votable");
// Format the result:
if (formatter == null)
throw new TAPException("Impossible to format the query result: no formatter has been found for the given MIME type \"" + format + "\" and for the default MIME type \"votable\" (short form) !");
return formatter;
}
/**
* <p>Start the asynchronous processing of the ADQL query.</p>
*
* <p>
* This function initialize the execution report, get the execution parameters (including the query to process)
* and then call {@link #start()}.
* </p>
*
* @param thread The asynchronous thread which asks the query processing.
*
* @return The resulting execution report.
*
* @throws UWSException If any error occurs while executing the ADQL query.
* @throws InterruptedException If the job has been interrupted (by the user or a time-out).
* * @see #start()
*/
public final TAPExecutionReport start(final AsyncThread thread) throws UWSException, InterruptedException{
if (this.thread != null || this.report != null)
throw new UWSException(UWSException.INTERNAL_SERVER_ERROR, "This ADQLExecutor has already been executed!");
this.thread = thread;
TAPJob tapJob = thread.getTAPJob();
this.tapParams = tapJob.getTapParams();
this.report = new TAPExecutionReport(tapJob.getJobId(), false, tapParams);
this.response = null;
try{
return start();
}catch(IOException ioe){
throw new UWSException(ioe);
}catch(TAPException te){
throw new UWSException(te.getHttpErrorCode(), te);
}
}
/**
* <p>Create the database connection required for the ADQL execution.</p>
*
* <p><i>Note: This function has no effect if the DB connection already exists.</i></p>
*
* @param jobID ID of the job which will be executed by this {@link ADQLExecutor}.
* This ID will be the database connection ID.
*
* @throws TAPException If the DB connection creation fails.
*
* @see TAPFactory#getConnection(String)
*
* @since 2.0
*/
public final void initDBConnection(final String jobID) throws TAPException{
if (dbConn == null)
dbConn = service.getFactory().getConnection(jobID);
}
/**
* <p>Start the synchronous processing of the ADQL query.</p>
*
* <p>This function initialize the execution report and then call {@link #start()}.</p>
*
* @param thread The synchronous thread which asks the query processing.
* @param jobId ID of the corresponding job.
* @param params All execution parameters (including the query to process).
* @param response Object in which the result or the error must be written.
*
* @return The resulting execution report.
*
* @throws TAPException If any error occurs while executing the ADQL query.
* @throws IOException If any error occurs while writing the result in the given {@link HttpServletResponse}.
* @throws InterruptedException If the job has been interrupted (by the user or a time-out).
*
* @see #start()
*/
public final TAPExecutionReport start(final Thread thread, final String jobId, final TAPParameters params, final HttpServletResponse response) throws TAPException, IOException, InterruptedException{
if (this.thread != null || this.report != null)
throw new TAPException("This ADQLExecutor has already been executed!");
this.thread = thread;
this.tapParams = params;
this.report = new TAPExecutionReport(jobId, true, tapParams);
this.response = response;
try{
return start(); }catch(UWSException ue){
throw new TAPException(ue, ue.getHttpErrorCode());
}
}
/**
* <p>Process the ADQL query.</p>
*
* <p>This function calls the following function (in the same order):</p>
* <ol>
* <li>{@link TAPFactory#getConnection(String)}</li>
* <li>{@link #uploadTables()}</li>
* <li>{@link #parseADQL()}</li>
* <li>{@link #executeADQL(ADQLQuery)}</li>
* <li>{@link #writeResult(TableIterator)}</li>
* <li>{@link #dropUploadedTables()}</li>
* <li>{@link TAPFactory#freeConnection(DBConnection)}</li>
* </ol>
*
* <p>
* The execution report is updated gradually. Besides a job parameter - progression - is set at each step of the process in order to
* notify the user of the progression of the query execution. This parameter is removed at the end of the execution if it is successful.
* </p>
*
* <p>The "interrupted" flag of the associated thread is often tested so that stopping the execution as soon as possible.</p>
*
* @return The updated execution report.
*
* @throws TAPException If any error occurs while executing the ADQL query.
* @throws UWSException If any error occurs while executing the ADQL query.
* @throws IOException If an error happens while writing the result in the specified {@link HttpServletResponse}.
* <i>That kind of error can be thrown only in synchronous mode.
* In asynchronous, the error is stored as job error report and is never propagated.</i>
* @throws InterruptedException If the job has been interrupted (by the user or a time-out).
*/
protected final TAPExecutionReport start() throws TAPException, UWSException, IOException, InterruptedException{
logger.logTAP(LogLevel.INFO, report, "START_EXEC", (report.synchronous ? "Synchronous" : "Asynchronous") + " execution of an ADQL query STARTED.", null);
// Save the start time (for reporting usage):
long start = System.currentTimeMillis();
TableIterator queryResult = null;
try{
// Get a "database" connection:
initDBConnection(report.jobID);
// 1. UPLOAD TABLES, if there is any:
if (tapParams.getUploadedTables() != null && tapParams.getUploadedTables().length > 0){
startStep(ExecutionProgression.UPLOADING);
uploadTables();
endStep();
}
if (thread.isInterrupted())
throw new InterruptedException();
// 2. PARSE THE ADQL QUERY:
startStep(ExecutionProgression.PARSING);
// Parse the query:
ADQLQuery adqlQuery = null;
try{
adqlQuery = parseADQL();
}catch(ParseException pe){
if (report.synchronous)
throw new TAPException("Incorrect ADQL query: " + pe.getMessage(), pe, UWSException.BAD_REQUEST, tapParams.getQuery(), progression);
else
throw new UWSException(UWSException.BAD_REQUEST, pe, "Incorrect ADQL query: " + pe.getMessage());
}
// List all resulting columns (it will be useful later to format the result): report.resultingColumns = adqlQuery.getResultingColumns();
endStep();
if (thread.isInterrupted())
throw new InterruptedException();
// 3. EXECUTE THE ADQL QUERY:
startStep(ExecutionProgression.EXECUTING_ADQL);
queryResult = executeADQL(adqlQuery);
endStep();
if (thread.isInterrupted())
throw new InterruptedException();
// 4. WRITE RESULT:
startStep(ExecutionProgression.WRITING_RESULT);
writeResult(queryResult);
endStep();
// Report the COMPLETED status:
tapParams.remove(TAPJob.PARAM_PROGRESSION);
report.success = true;
// Set the total duration in the report:
report.setTotalDuration(System.currentTimeMillis() - start);
// Log and report the end of this execution:
logger.logTAP(LogLevel.INFO, report, "END_EXEC", "ADQL query execution finished.", null);
return report;
}finally{
// Close the result if any:
if (queryResult != null){
try{
queryResult.close();
}catch(DataReadException dre){
logger.logTAP(LogLevel.WARNING, report, "END_EXEC", "Can not close the database query result!", dre);
}
}
// Drop all the uploaded tables (they are not supposed to exist after the query execution):
try{
dropUploadedTables();
}catch(TAPException e){
logger.logTAP(LogLevel.WARNING, report, "END_EXEC", "Can not drop the uploaded tables from the database!", e);
}
// Free the connection (so that giving it back to a pool, if any, otherwise, just free resources):
if (dbConn != null){
service.getFactory().freeConnection(dbConn);
dbConn = null;
}
}
}
/**
* <p>Memorize the time at which the step starts, the step ID and update the job parameter "progression"
* (to notify the user about the progression of the query processing).</p>
*
* <p><i>Note:
* If for some reason the job parameter "progression" can not be updated, no error will be thrown. A WARNING message
* will be just written in the log.
* </i></p>
*
* <p><i>Note:
* This function is designed to work with {@link #endStep()}, which must be called after it, when the step is finished (successfully or not).
* </i></p>
*
* @param progression ID of the starting step.
* * @see #endStep()
*/
private void startStep(final ExecutionProgression progression){
// Save the start time (for report usage):
startStep = System.currentTimeMillis();
// Memorize the current step:
this.progression = progression;
// Update the job parameter "progression", to notify the user about the progression of the query processing:
try{
tapParams.set(TAPJob.PARAM_PROGRESSION, this.progression);
}catch(UWSException ue){
// should not happen, but just in case...
logger.logTAP(LogLevel.WARNING, report, "START_STEP", "Can not set/update the informative job parameter \"" + TAPJob.PARAM_PROGRESSION + "\" (this parameter would be just for notification purpose about the execution progression)!", ue);
}
}
/**
* <p>Set the duration of the current step in the execution report.</p>
*
* <p><i>Note:
* The start time and the ID of the step are then forgotten.
* </i></p>
*
* <p><i>Note:
* This function is designed to work with {@link #startStep(ExecutionProgression)}, which must be called before it, when the step is starting.
* It marks the end of a step.
* </i></p>
*
* @see #startStep(ExecutionProgression)
*/
private void endStep(){
if (progression != null){
// Set the duration of this step in the execution report:
report.setDuration(progression, System.currentTimeMillis() - startStep);
// No start time:
startStep = -1;
// No step for the moment:
progression = null;
}
}
/**
* <p>Create in the "database" all tables uploaded by the user (only for this specific query execution).</p>
*
* <p><i>Note:
* Obviously, nothing is done if no table has been uploaded.
* </i></p>
*
* @throws TAPException If any error occurs while reading the uploaded table
* or while importing them in the database.
*/
private final void uploadTables() throws TAPException{
// Fetch the tables to upload:
DALIUpload[] tables = tapParams.getUploadedTables();
// Upload them, if needed:
if (tables.length > 0){
logger.logTAP(LogLevel.INFO, report, "UPLOADING", "Loading uploaded tables (" + tables.length + ")", null);
uploadSchema = service.getFactory().createUploader(dbConn).upload(tables);
}
}
/**
* <p>Parse the ADQL query provided in the parameters by the user.</p>
*
* <p>The query factory and the query checker are got from the TAP factory.</p>
*
* <p>
* The configuration of this TAP service list all allowed coordinate systems. These are got here and provided to the query checker
* in order to ensure the coordinate systems used in the query are in this list. * </p>
*
* <p>
* The row limit specified in the ADQL query (with TOP) is checked and adjusted (if needed). Indeed, this limit
* can not exceed MAXREC given in parameter and the maximum value specified in the configuration of this TAP service.
* In the case no row limit is specified in the query or the given value is greater than MAXREC, (MAXREC+1) is used by default.
* The "+1" aims to detect overflows.
* </p>
*
* @return The object representation of the ADQL query.
*
* @throws ParseException If the given ADQL query can not be parsed or if the construction of the object representation has failed.
* @throws InterruptedException If the thread has been interrupted.
* @throws TAPException If the TAP factory is unable to create the ADQL factory or the query checker.
*/
protected ADQLQuery parseADQL() throws ParseException, InterruptedException, TAPException{
// Log the start of the parsing:
logger.logTAP(LogLevel.INFO, report, "PARSING", "Parsing ADQL: " + tapParams.getQuery().replaceAll("(\t|\r?\n)+", " "), null);
// Create the ADQL parser:
ADQLParser parser = service.getFactory().createADQLParser();
if (parser == null){
logger.logTAP(LogLevel.WARNING, null, "PARSING", "No ADQL parser returned by the TAPFactory! The default implementation is used instead.", null);
parser = new ADQLParser();
}
// Set the ADQL factory:
if (parser.getQueryFactory() == null || parser.getQueryFactory().getClass() == ADQLQueryFactory.class)
parser.setQueryFactory(service.getFactory().createQueryFactory());
// Set the query checker:
if (parser.getQueryChecker() == null)
parser.setQueryChecker(service.getFactory().createQueryChecker(uploadSchema));
// Parse the ADQL query:
ADQLQuery query = parser.parseQuery(tapParams.getQuery());
// Set or check the row limit:
final int limit = query.getSelect().getLimit();
final Integer maxRec = tapParams.getMaxRec();
if (maxRec != null && maxRec > -1){
if (limit <= -1 || limit > maxRec)
query.getSelect().setLimit(maxRec + 1);
}
return query;
}
/**
* <p>Execute in "database" the given object representation of an ADQL query.</p>
*
* <p>By default, this function is just calling {@link DBConnection#executeQuery(ADQLQuery)} and then it returns the value returned by this call.</p>
*
* <p><i>Note:
* An INFO message is logged at the end of the query execution in order to report the result status (success or error)
* and the execution duration.
* </i></p>
*
* @param adql The object representation of the ADQL query to execute.
*
* @return The result of the query,
* or NULL if the query execution has failed.
*
* @throws InterruptedException If the thread has been interrupted.
* @throws TAPException If the {@link DBConnection} has failed to deal with the given ADQL query.
*
* @see DBConnection#executeQuery(ADQLQuery)
*/
protected TableIterator executeADQL(final ADQLQuery adql) throws InterruptedException, TAPException{
// Log the start of execution: logger.logTAP(LogLevel.INFO, report, "START_DB_EXECUTION", "ADQL query: " + adql.toADQL().replaceAll("(\t|\r?\n)+", " "), null);
// Set the fetch size, if any:
if (service.getFetchSize() != null && service.getFetchSize().length >= 1){
if (report.synchronous && service.getFetchSize().length >= 2)
dbConn.setFetchSize(service.getFetchSize()[1]);
else
dbConn.setFetchSize(service.getFetchSize()[0]);
}
// Execute the ADQL query:
TableIterator result = dbConn.executeQuery(adql);
// Log the success or failure:
if (result == null)
logger.logTAP(LogLevel.INFO, report, "END_DB_EXECUTION", "Query execution aborted after " + (System.currentTimeMillis() - startStep) + "ms!", null);
else
logger.logTAP(LogLevel.INFO, report, "END_DB_EXECUTION", "Query successfully executed in " + (System.currentTimeMillis() - startStep) + "ms!", null);
return result;
}
/**
* <p>Write the given query result into the appropriate format in the appropriate output
* (HTTP response for a synchronous execution, otherwise a file or any output provided by UWS).</p>
*
* <p>This function prepare the output in function of the execution type (synchronous or asynchronous).
* Once prepared, the result, the output and the formatter to use are given to {@link #writeResult(TableIterator, OutputFormat, OutputStream)}
* which will really process the result formatting and writing.
* </p>
*
* @param queryResult The result of the query execution in database.
*
* @throws InterruptedException If the thread has been interrupted.
* @throws IOException If an error happens while writing the result in the {@link HttpServletResponse}.
* <i>That kind of error can be thrown only in synchronous mode.
* In asynchronous, the error is stored as job error report and is never propagated.</i>
* @throws TAPException If an error occurs while getting the appropriate formatter or while formatting or writing (synchronous execution) the result.
* @throws UWSException If an error occurs while getting the output stream or while writing (asynchronous execution) the result.
*
* @see #writeResult(TableIterator, OutputFormat, OutputStream)
*/
protected final void writeResult(final TableIterator queryResult) throws InterruptedException, IOException, TAPException, UWSException{
// Log the start of the writing:
logger.logTAP(LogLevel.INFO, report, "WRITING_RESULT", "Writing the query result", null);
// Get the appropriate result formatter:
OutputFormat formatter = getFormatter();
// CASE SYNCHRONOUS:
if (response != null){
long start = -1;
// Set the HTTP content type to the MIME type of the result format:
response.setContentType(formatter.getMimeType());
// Set the character encoding:
response.setCharacterEncoding(UWSToolBox.DEFAULT_CHAR_ENCODING);
// Write the formatted result in the HTTP response output:
start = System.currentTimeMillis();
writeResult(queryResult, formatter, response.getOutputStream());
logger.logTAP(LogLevel.INFO, report, "RESULT_WRITTEN", "Result formatted (in " + formatter.getMimeType() + " ; " + (report.nbRows < 0 ? "?" : report.nbRows) + " rows ; " + ((report.resultingColumns == null) ? "?" : report.resultingColumns.length) + " columns) in " + ((start <= 0) ? "?" : (System.currentTimeMillis() - start)) + "ms!", null);
}
// CASE ASYNCHRONOUS:
else{
long start = -1, end = -1;
try{
// Create a UWS Result object to store the result // (the result will be stored in a file and this object is the association between the job and the result file):
JobThread jobThread = (JobThread)thread;
Result result = jobThread.createResult();
// Set the MIME type of the result format in the result description:
result.setMimeType(formatter.getMimeType());
// Write the formatted result in the file output:
start = System.currentTimeMillis();
writeResult(queryResult, formatter, jobThread.getResultOutput(result));
end = System.currentTimeMillis();
// Set the size (in bytes) of the result in the result description:
result.setSize(jobThread.getResultSize(result));
// Add the result description and link in the job description:
jobThread.publishResult(result);
logger.logTAP(LogLevel.INFO, report, "RESULT_WRITTEN", "Result formatted (in " + formatter.getMimeType() + " ; " + (report.nbRows < 0 ? "?" : report.nbRows) + " rows ; " + ((report.resultingColumns == null) ? "?" : report.resultingColumns.length) + " columns) in " + ((start <= 0 || end <= 0) ? "?" : (end - start)) + "ms!", null);
}catch(IOException ioe){
throw new UWSException(UWSException.INTERNAL_SERVER_ERROR, ioe, "Impossible to write in the file into the result of the job " + report.jobID + " must be written!");
}
}
}
/**
* <p>Format and write the given result in the given output with the given formatter.</p>
*
* <p>By default, this function is just calling {@link OutputFormat#writeResult(TableIterator, OutputStream, TAPExecutionReport, Thread)}.</p>
*
* <p><i>Note:
* {@link OutputFormat#writeResult(TableIterator, OutputStream, TAPExecutionReport, Thread)} is often testing the "interrupted" flag of the
* thread in order to stop as fast as possible if the user has cancelled the job or if the thread has been interrupted for another reason.
* </i></p>
*
* @param queryResult Query result to format and to output.
* @param formatter The object able to write the result in the appropriate format.
* @param output The stream in which the result must be written.
*
* @throws InterruptedException If the thread has been interrupted.
* @throws IOException If there is an error while writing the result in the given stream.
* @throws TAPException If there is an error while formatting the result.
*/
protected void writeResult(TableIterator queryResult, OutputFormat formatter, OutputStream output) throws InterruptedException, IOException, TAPException{
formatter.writeResult(queryResult, output, report, thread);
}
/**
* <p>Drop all tables uploaded by the user from the database.</p>
*
* <p><i>Note:
* By default, if an error occurs while dropping a table from the database, the error will just be logged ; it won't be thrown/propagated.
* </i></p>
*
* @throws TAPException If a grave error occurs. <i>By default, no exception is thrown ; they are just logged.</i>
*/
protected void dropUploadedTables() throws TAPException{
if (uploadSchema != null){
// Drop all uploaded tables:
for(TAPTable t : uploadSchema){
try{
dbConn.dropUploadedTable(t);
}catch(DBException dbe){
logger.logTAP(LogLevel.ERROR, report, "DROP_UPLOAD", "Can not drop the uploaded table \"" + t.getDBName() + "\" (in adql \"" + t.getADQLName() + "\") from the database!", dbe);
}
}
}
}
}