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package com.unboundid.directory.sdk.examples;
import java.io.File;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.unboundid.directory.sdk.common.types.InternalConnection;
import com.unboundid.directory.sdk.common.types.LogSeverity;
import com.unboundid.directory.sdk.ds.api.Task;
import com.unboundid.directory.sdk.ds.types.DirectoryServerContext;
import com.unboundid.directory.sdk.ds.types.TaskContext;
import com.unboundid.directory.sdk.ds.types.TaskReturnState;
import com.unboundid.ldap.sdk.Filter;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPSearchException;
import com.unboundid.ldap.sdk.SearchRequest;
import com.unboundid.ldap.sdk.SearchResult;
import com.unboundid.ldap.sdk.SearchResultEntry;
import com.unboundid.ldap.sdk.SearchResultListener;
import com.unboundid.ldap.sdk.SearchResultReference;
import com.unboundid.ldap.sdk.SearchScope;
import com.unboundid.ldif.LDIFWriter;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.args.ArgumentException;
import com.unboundid.util.args.ArgumentParser;
import com.unboundid.util.args.DNArgument;
import com.unboundid.util.args.FileArgument;
import com.unboundid.util.args.FilterArgument;
import com.unboundid.util.args.StringArgument;
/**
* This class provides a simple example of a task that will perform an internal
* search and write the results to a file on the server filesystem. The search
* criteria will be specified using the provided arguments:
* <UL>
* <LI>base-dn -- The base DN for the search to perform.</LI>
* <LI>scope -- The scope for the search. The value should be one of the
* following strings: base, one, sub, or subordinate-subtree.</LI>
* <LI>filter -- The filter for the search.</LI>
* <LI>attribute -- An attribute to request. This may be provided multiple
* times to request multiple attributes.</LI>
* <LI>output-file -- The path to the file to which the search results should
* be written.</LI>
* </UL>
*/
public final class ExampleTask
extends Task
implements SearchResultListener
{
/**
* The name of the argument used to specify the search base DN.
*/
private static final String ARG_NAME_BASE_DN = "base-dn";
/**
* The name of the argument used to specify the search scope.
*/
private static final String ARG_NAME_SCOPE = "scope";
/**
* The name of the argument used to specify the filter.
*/
private static final String ARG_NAME_FILTER = "filter";
/**
* The name of the argument used to specify the requested attributes.
*/
private static final String ARG_NAME_ATTR = "attribute";
/**
* The name of the argument used to specify the path to the output file.
*/
private static final String ARG_NAME_OUTPUT_FILE = "output-file";
/**
* The set of allowed search scope values.
*/
private static final Set<String> ALLOWED_SCOPES;
/**
* The map of search scope names to values.
*/
private static final Map<String,SearchScope> SCOPE_MAP;
static
{
final LinkedHashMap<String,SearchScope> scopeMap =
new LinkedHashMap<String,SearchScope>(4);
scopeMap.put("base", SearchScope.BASE);
scopeMap.put("one", SearchScope.ONE);
scopeMap.put("sub", SearchScope.SUB);
scopeMap.put("subordinate-subtree", SearchScope.SUBORDINATE_SUBTREE);
SCOPE_MAP = Collections.unmodifiableMap(scopeMap);
ALLOWED_SCOPES = Collections.unmodifiableSet(scopeMap.keySet());
}
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = 9088385267966197988L;
// The server context for the server in which this extension is running.
private DirectoryServerContext serverContext;
// The output file for the search results.
private File outputFile;
// The filter for the search.
private Filter filter;
// The LDIF writer to use when writing the results.
private volatile LDIFWriter ldifWriter;
// The list of requested attributes.
private List<String> requestedAttributes;
// The scope for the search.
private SearchScope scope;
// The base DN for the search.
private String baseDN;
// The task context for the task.
private volatile TaskContext taskContext;
// The return state for the task.
private volatile TaskReturnState returnState;
/**
* Creates a new instance of this task. All task implementations must
* include a default constructor, but any initialization should generally be
* done in the {@code initializeTask} method.
*/
public ExampleTask()
{
// No implementation required.
}
/**
* Retrieves a human-readable name for this extension.
*
* @return A human-readable name for this extension.
*/
@Override()
public String getExtensionName()
{
return "Example Task";
}
/**
* Retrieves a human-readable description for this extension. Each element
* of the array that is returned will be considered a separate paragraph in
* generated documentation.
*
* @return A human-readable description for this extension, or {@code null}
* or an empty array if no description should be available.
*/
@Override()
public String[] getExtensionDescription()
{
return new String[]
{
"This task serves an example that may be used to demonstrate the " +
"process for creating a third-party task. It will simply " +
"perform an internal search (in which the base DN, scope, filter, " +
"and requested attributes are provided as task arguments) and " +
"write the results to a file on the server filesystem."
};
}
/**
* Updates the provided argument parser to define any configuration arguments
* which may be used by this plugin. The argument parser may also be updated
* to define relationships between arguments (e.g., to specify required,
* exclusive, or dependent argument sets).
*
* @param parser The argument parser to be updated with the configuration
* arguments which may be used by this plugin.
*
* @throws ArgumentException If a problem is encountered while updating the
* provided argument parser.
*/
@Override()
public void defineConfigArguments(final ArgumentParser parser)
throws ArgumentException
{
// Add an argument that allows you to specify the search base DN.
Character shortIdentifier = null;
String longIdentifier = ARG_NAME_BASE_DN;
boolean required = true;
int maxOccurrences = 1;
String placeholder = "{dn}";
String description = "The base DN to use for the search.";
parser.addArgument(new DNArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description));
// Add an argument that allows you to specify the search scope.
shortIdentifier = null;
longIdentifier = ARG_NAME_SCOPE;
required = true;
maxOccurrences = 1;
placeholder = "{base|one|sub|subordinate-subtree}";
description = "The scope to use for the search.";
parser.addArgument(new StringArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description,
ALLOWED_SCOPES));
// Add an argument that allows you to specify the search filter.
shortIdentifier = null;
longIdentifier = ARG_NAME_FILTER;
required = true;
maxOccurrences = 1;
placeholder = "{filter}";
description = "The filter to use for the search.";
parser.addArgument(new FilterArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description));
// Add an argument that allows you to specify the requested attributes.
shortIdentifier = null;
longIdentifier = ARG_NAME_ATTR;
required = false;
maxOccurrences = 0; // No limit
placeholder = "{attr}";
description = "An attribute to include in matching entries. This " +
"argument may be provided multiple times to request multiple " +
"attributes. If no requested attributes are provided, then all " +
"user attributes will be requested.";
parser.addArgument(new StringArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description));
// Add an argument that allows you to specify the output file.
shortIdentifier = null;
longIdentifier = ARG_NAME_OUTPUT_FILE;
required = true;
maxOccurrences = 1;
placeholder = "{path}";
description = "The output file to which the search results should be " +
"written. Relative paths will be relative to the server root.";
boolean fileMustExist = false;
boolean parentMustExist = true;
boolean mustBeFile = true;
boolean mustBeDirectory = false;
parser.addArgument(new FileArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description, fileMustExist,
parentMustExist, mustBeFile, mustBeDirectory));
}
/**
* Initializes this task.
*
* @param serverContext A handle to the server context for the server in
* which this task is running.
* @param parser The argument parser which has been initialized from
* the configuration for this task.
*
* @throws LDAPException If a problem occurs while initializing this task.
*/
@Override()
public void initializeTask(final DirectoryServerContext serverContext,
final ArgumentParser parser)
throws LDAPException
{
this.serverContext = serverContext;
// Get the base DN.
final DNArgument baseArg =
(DNArgument) parser.getNamedArgument(ARG_NAME_BASE_DN);
baseDN = baseArg.getValue().toString();
// Get the scope.
final StringArgument scopeArg =
(StringArgument) parser.getNamedArgument(ARG_NAME_SCOPE);
scope = SCOPE_MAP.get(StaticUtils.toLowerCase(scopeArg.getValue()));
// Get the filter.
final FilterArgument filterArg =
(FilterArgument) parser.getNamedArgument(ARG_NAME_FILTER);
filter = filterArg.getValue();
// Get the list of requested attributes.
final StringArgument attrsArg =
(StringArgument) parser.getNamedArgument(ARG_NAME_ATTR);
requestedAttributes = attrsArg.getValues();
// Get the output file.
final FileArgument outputFileArg =
(FileArgument) parser.getNamedArgument(ARG_NAME_OUTPUT_FILE);
outputFile = outputFileArg.getValue();
}
/**
* Retrieves a human-readable name that may be used for this task.
*
* @return A human-readable name that may be used for this task.
*/
@Override()
public String getTaskName()
{
return "Example Internal Search Task";
}
/**
* Performs the appropriate processing for this task.
*
* @param taskContext Information about the task to be run.
*
* @return Information about the state of the task after processing has
* completed.
*/
@Override()
public TaskReturnState runTask(final TaskContext taskContext)
{
this.taskContext = taskContext;
// Create an LDIF writer to use to write the results.
try
{
ldifWriter = new LDIFWriter(outputFile);
}
catch (final Exception e)
{
serverContext.debugCaught(e);
serverContext.logMessage(LogSeverity.SEVERE_ERROR,
"Unable to create an LDIF writer to write to file " +
outputFile.getAbsolutePath() + " for task " +
taskContext.getTaskEntryDN() + ": " +
StaticUtils.getExceptionMessage(e));
return TaskReturnState.STOPPED_BY_ERROR;
}
try
{
// Append a header to the LDIF file with details of the search.
try
{
ldifWriter.writeComment("Internal search initiated at " +
new Date().toString() + " for task " +
taskContext.getTaskEntryDN(),
false, false);
ldifWriter.writeComment("Base DN: " + baseDN, false, false);
ldifWriter.writeComment("Scope: " + scope.getName(), false, false);
ldifWriter.writeComment("Filter: " + filter.toString(), false, false);
ldifWriter.writeComment("Requested Attributes: " + requestedAttributes,
false, true);
}
catch (final Exception e)
{
serverContext.debugCaught(e);
serverContext.logMessage(LogSeverity.SEVERE_ERROR,
"Unable to write a header to LDIF file " +
outputFile.getAbsolutePath() + ": " +
StaticUtils.getExceptionMessage(e));
return TaskReturnState.STOPPED_BY_ERROR;
}
// Create the search request to issue. We'll use a search result listener
// since the search may return a large number of entries.
final SearchRequest searchRequest = new SearchRequest(this, baseDN, scope,
filter);
searchRequest.setAttributes(requestedAttributes);
// Get an internal connection and issue the search.
returnState = TaskReturnState.COMPLETED_SUCCESSFULLY;
SearchResult searchResult;
try
{
final InternalConnection conn =
serverContext.getInternalRootConnection();
searchResult = conn.search(searchRequest);
}
catch (final LDAPSearchException lse)
{
serverContext.debugCaught(lse);
searchResult = lse.getSearchResult();
if (returnState == TaskReturnState.COMPLETED_SUCCESSFULLY)
{
returnState = TaskReturnState.COMPLETED_WITH_ERRORS;
}
serverContext.logMessage(LogSeverity.MILD_ERROR,
"An error occurred while processing the search for task " +
taskContext.getTaskEntryDN() + ": " +
searchResult.toString());
}
// Append a footer to the LDIF file with a summary of the results.
try
{
ldifWriter.writeComment("Internal search completed at " +
new Date().toString(),
true, false);
ldifWriter.writeComment("Result Code: " +
searchResult.getResultCode().toString(),
false, false);
final String diagnosticMessage = searchResult.getDiagnosticMessage();
if (diagnosticMessage != null)
{
ldifWriter.writeComment("Diagnostic Message: " + diagnosticMessage,
false, false);
}
final String matchedDN = searchResult.getMatchedDN();
if (matchedDN != null)
{
ldifWriter.writeComment("Matched DN: " + matchedDN,
false, false);
}
final String[] referralURLs = searchResult.getReferralURLs();
if ((referralURLs != null) && (referralURLs.length > 0))
{
ldifWriter.writeComment("Referral URLs: " +
Arrays.toString(referralURLs),
false, false);
}
ldifWriter.writeComment("Entries Returned: " +
searchResult.getEntryCount(),
false, false);
ldifWriter.writeComment("References Returned: " +
searchResult.getReferenceCount(),
false, false);
}
catch (final Exception e)
{
serverContext.debugCaught(e);
serverContext.logMessage(LogSeverity.SEVERE_ERROR,
"Unable to write a header to LDIF file " +
outputFile.getAbsolutePath() + ": " +
StaticUtils.getExceptionMessage(e));
return TaskReturnState.STOPPED_BY_ERROR;
}
return returnState;
}
finally
{
try
{
ldifWriter.close();
}
catch (final Exception e)
{
serverContext.debugCaught(e);
serverContext.logMessage(LogSeverity.SEVERE_ERROR,
"An error occurred while closing file " +
outputFile.getAbsolutePath() + " for task " +
taskContext.getTaskEntryDN() + ": " +
StaticUtils.getExceptionMessage(e));
}
}
}
/**
* Indicates whether this task may be interrupted before it has completed
* (e.g., canceled by an administrator or aborted at server shutdown). It is
* particularly important that potentially long-running tasks be interruptible
* so that they do not impede server shutdown or consume excessive resources.
*
* @return {@code true} if this task may be interrupted before it has
* completed, or {@code false} if it cannot be interrupted.
*/
@Override()
public boolean isInterruptible()
{
return false;
}
/**
* Attempts to interrupt the execution of this task. This should only be
* called if the {@link #isInterruptible} method returns {@code true}.
*
* @param interruptState The return state that should be used for the task
* if it is successfully interrupted.
* @param interruptReason A message that provides a reason that the task has
* been interrupted.
*/
@Override()
public void interruptTask(final TaskReturnState interruptState,
final String interruptReason)
{
// No action is performed by default, since this task doesn't support
// being interrupted.
}
/**
* Retrieves a map containing examples of configurations that may be used for
* this extension. The map key should be a list of sample arguments, and the
* corresponding value should be a description of the behavior that will be
* exhibited by the extension when used with that configuration.
*
* @return A map containing examples of configurations that may be used for
* this extension. It may be {@code null} or empty if there should
* not be any example argument sets.
*/
@Override()
public Map<List<String>,String> getExamplesArgumentSets()
{
final LinkedHashMap<List<String>,String> exampleMap =
new LinkedHashMap<List<String>,String>(1);
exampleMap.put(
Arrays.asList(
ARG_NAME_ATTR + "=description"),
"Prevent the 'description' attribute from being targeted by " +
"client operations or returned in search result entries.");
return exampleMap;
}
/**
* Indicates that the provided search result entry has been returned by the
* server and may be processed by this search result listener.
*
* @param searchEntry The search result entry that has been returned by the
* server.
*/
public void searchEntryReturned(final SearchResultEntry searchEntry)
{
try
{
ldifWriter.writeEntry(searchEntry);
}
catch (final Exception e)
{
serverContext.debugCaught(e);
serverContext.logMessage(LogSeverity.SEVERE_ERROR,
"An error occurred while attempting to write matching entry " +
searchEntry.getDN() + " to file " +
outputFile.getAbsolutePath() + " for task " +
taskContext.getTaskEntryDN() + ": " +
StaticUtils.getExceptionMessage(e));
returnState = TaskReturnState.COMPLETED_WITH_ERRORS;
}
}
/**
* Indicates that the provided search result reference has been returned by
* the server and may be processed by this search result listener.
*
* @param searchReference The search result reference that has been returned
* by the server.
*/
public void searchReferenceReturned(
final SearchResultReference searchReference)
{
try
{
ldifWriter.writeComment(
"Received search result reference with URLs " +
Arrays.toString(searchReference.getReferralURLs()),
true, true);
}
catch (final Exception e)
{
serverContext.debugCaught(e);
serverContext.logMessage(LogSeverity.SEVERE_ERROR,
"An error occurred while attempting to information about " +
"search result reference " +
Arrays.toString(searchReference.getReferralURLs()) +
" to file " + outputFile.getAbsolutePath() + " for task " +
taskContext.getTaskEntryDN() + ": " +
StaticUtils.getExceptionMessage(e));
returnState = TaskReturnState.COMPLETED_WITH_ERRORS;
}
}
}
