package com.hwlcn.ldap.ldap.sdk;
import java.util.Timer;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import com.hwlcn.ldap.asn1.ASN1Buffer;
import com.hwlcn.ldap.asn1.ASN1Element;
import com.hwlcn.ldap.asn1.ASN1OctetString;
import com.hwlcn.ldap.ldap.protocol.LDAPMessage;
import com.hwlcn.ldap.ldap.protocol.LDAPResponse;
import com.hwlcn.ldap.ldap.protocol.ProtocolOp;
import com.hwlcn.ldap.ldif.LDIFDeleteChangeRecord;
import com.hwlcn.core.annotation.InternalUseOnly;
import com.hwlcn.core.annotation.Mutable;
import com.hwlcn.core.annotation.ThreadSafety;
import com.hwlcn.ldap.util.ThreadSafetyLevel;
import static com.hwlcn.ldap.ldap.sdk.LDAPMessages.*;
import static com.hwlcn.ldap.util.Debug.*;
import static com.hwlcn.ldap.util.StaticUtils.*;
import static com.hwlcn.ldap.util.Validator.*;
/**
* This class implements the processing necessary to perform an LDAPv3 delete
* operation, which removes an entry from the directory. A delete request
* contains the DN of the entry to remove. It may also include a set of
* controls to send to the server.
* {@code DeleteRequest} objects are mutable and therefore can be altered and
* re-used for multiple requests. Note, however, that {@code DeleteRequest}
* objects are not threadsafe and therefore a single {@code DeleteRequest}
* object instance should not be used to process multiple requests at the same
* time.
* <BR><BR>
* <H2>Example</H2>
* The following example demonstrates the process for performing a delete
* operation:
* <PRE>
* DeleteRequest deleteRequest =
* new DeleteRequest("cn=entry to delete,dc=example,dc=com");
*
* try
* {
* LDAPResult deleteResult = connection.delete(deleteRequest);
*
* System.out.println("The entry was successfully deleted.");
* }
* catch (LDAPException le)
* {
* System.err.println("The delete operation failed.");
* }
* </PRE>
*/
@Mutable()
@ThreadSafety(level=ThreadSafetyLevel.NOT_THREADSAFE)
public final class DeleteRequest
extends UpdatableLDAPRequest
implements ReadOnlyDeleteRequest, ResponseAcceptor, ProtocolOp
{
private static final long serialVersionUID = -6126029442850884239L;
private int messageID = -1;
private final LinkedBlockingQueue<LDAPResponse> responseQueue =
new LinkedBlockingQueue<LDAPResponse>();
private String dn;
public DeleteRequest(final String dn)
{
super(null);
ensureNotNull(dn);
this.dn = dn;
}
public DeleteRequest(final String dn, final Control[] controls)
{
super(controls);
ensureNotNull(dn);
this.dn = dn;
}
public DeleteRequest(final DN dn)
{
super(null);
ensureNotNull(dn);
this.dn = dn.toString();
}
public DeleteRequest(final DN dn, final Control[] controls)
{
super(controls);
ensureNotNull(dn);
this.dn = dn.toString();
}
public String getDN()
{
return dn;
}
public void setDN(final String dn)
{
ensureNotNull(dn);
this.dn = dn;
}
public void setDN(final DN dn)
{
ensureNotNull(dn);
this.dn = dn.toString();
}
public byte getProtocolOpType()
{
return LDAPMessage.PROTOCOL_OP_TYPE_DELETE_REQUEST;
}
public void writeTo(final ASN1Buffer buffer)
{
buffer.addOctetString(LDAPMessage.PROTOCOL_OP_TYPE_DELETE_REQUEST, dn);
}
public ASN1Element encodeProtocolOp()
{
return new ASN1OctetString(LDAPMessage.PROTOCOL_OP_TYPE_DELETE_REQUEST, dn);
}
@Override()
protected LDAPResult process(final LDAPConnection connection, final int depth)
throws LDAPException
{
if (connection.synchronousMode())
{
return processSync(connection, depth,
connection.getConnectionOptions().autoReconnect());
}
final long requestTime = System.nanoTime();
processAsync(connection, null);
try
{
final LDAPResponse response;
try
{
final long responseTimeout = getResponseTimeoutMillis(connection);
if (responseTimeout > 0)
{
response = responseQueue.poll(responseTimeout, TimeUnit.MILLISECONDS);
}
else
{
response = responseQueue.take();
}
}
catch (InterruptedException ie)
{
debugException(ie);
throw new LDAPException(ResultCode.LOCAL_ERROR,
ERR_DELETE_INTERRUPTED.get(connection.getHostPort()), ie);
}
return handleResponse(connection, response, requestTime, depth, false);
}
finally
{
connection.deregisterResponseAcceptor(messageID);
}
}
AsyncRequestID processAsync(final LDAPConnection connection,
final AsyncResultListener resultListener)
throws LDAPException
{
messageID = connection.nextMessageID();
final LDAPMessage message = new LDAPMessage(messageID, this, getControls());
final AsyncRequestID asyncRequestID;
if (resultListener == null)
{
asyncRequestID = null;
connection.registerResponseAcceptor(messageID, this);
}
else
{
final AsyncHelper helper = new AsyncHelper(connection,
OperationType.DELETE, messageID, resultListener,
getIntermediateResponseListener());
connection.registerResponseAcceptor(messageID, helper);
asyncRequestID = helper.getAsyncRequestID();
final long timeout = getResponseTimeoutMillis(connection);
if (timeout > 0L)
{
final Timer timer = connection.getTimer();
final AsyncTimeoutTimerTask timerTask =
new AsyncTimeoutTimerTask(helper);
timer.schedule(timerTask, timeout);
asyncRequestID.setTimerTask(timerTask);
}
}
try
{
debugLDAPRequest(this);
connection.getConnectionStatistics().incrementNumDeleteRequests();
connection.sendMessage(message);
return asyncRequestID;
}
catch (LDAPException le)
{
debugException(le);
connection.deregisterResponseAcceptor(messageID);
throw le;
}
}
private LDAPResult processSync(final LDAPConnection connection,
final int depth, final boolean allowRetry)
throws LDAPException
{
messageID = connection.nextMessageID();
final LDAPMessage message =
new LDAPMessage(messageID, this, getControls());
try
{
connection.getConnectionInternals(true).getSocket().setSoTimeout(
(int) getResponseTimeoutMillis(connection));
}
catch (Exception e)
{
debugException(e);
}
final long requestTime = System.nanoTime();
debugLDAPRequest(this);
connection.getConnectionStatistics().incrementNumDeleteRequests();
try
{
connection.sendMessage(message);
}
catch (final LDAPException le)
{
debugException(le);
if (allowRetry)
{
final LDAPResult retryResult = reconnectAndRetry(connection, depth,
le.getResultCode());
if (retryResult != null)
{
return retryResult;
}
}
throw le;
}
while (true)
{
final LDAPResponse response;
try
{
response = connection.readResponse(messageID);
}
catch (final LDAPException le)
{
debugException(le);
if ((le.getResultCode() == ResultCode.TIMEOUT) &&
connection.getConnectionOptions().abandonOnTimeout())
{
connection.abandon(messageID);
}
if (allowRetry)
{
final LDAPResult retryResult = reconnectAndRetry(connection, depth,
le.getResultCode());
if (retryResult != null)
{
return retryResult;
}
}
throw le;
}
if (response instanceof IntermediateResponse)
{
final IntermediateResponseListener listener =
getIntermediateResponseListener();
if (listener != null)
{
listener.intermediateResponseReturned(
(IntermediateResponse) response);
}
}
else
{
return handleResponse(connection, response, requestTime, depth,
allowRetry);
}
}
}
private LDAPResult handleResponse(final LDAPConnection connection,
final LDAPResponse response,
final long requestTime, final int depth,
final boolean allowRetry)
throws LDAPException
{
if (response == null)
{
final long waitTime = nanosToMillis(System.nanoTime() - requestTime);
if (connection.getConnectionOptions().abandonOnTimeout())
{
connection.abandon(messageID);
}
throw new LDAPException(ResultCode.TIMEOUT,
ERR_DELETE_CLIENT_TIMEOUT.get(waitTime, connection.getHostPort()));
}
connection.getConnectionStatistics().incrementNumDeleteResponses(
System.nanoTime() - requestTime);
if (response instanceof ConnectionClosedResponse)
{
if (allowRetry)
{
final LDAPResult retryResult = reconnectAndRetry(connection, depth,
ResultCode.SERVER_DOWN);
if (retryResult != null)
{
return retryResult;
}
}
final ConnectionClosedResponse ccr = (ConnectionClosedResponse) response;
final String message = ccr.getMessage();
if (message == null)
{
throw new LDAPException(ccr.getResultCode(),
ERR_CONN_CLOSED_WAITING_FOR_DELETE_RESPONSE.get(
connection.getHostPort(), toString()));
}
else
{
throw new LDAPException(ccr.getResultCode(),
ERR_CONN_CLOSED_WAITING_FOR_DELETE_RESPONSE_WITH_MESSAGE.get(
connection.getHostPort(), toString(), message));
}
}
final LDAPResult result = (LDAPResult) response;
if ((result.getResultCode().equals(ResultCode.REFERRAL)) &&
followReferrals(connection))
{
if (depth >= connection.getConnectionOptions().getReferralHopLimit())
{
return new LDAPResult(messageID, ResultCode.REFERRAL_LIMIT_EXCEEDED,
ERR_TOO_MANY_REFERRALS.get(),
result.getMatchedDN(), result.getReferralURLs(),
result.getResponseControls());
}
return followReferral(result, connection, depth);
}
else
{
if (allowRetry)
{
final LDAPResult retryResult = reconnectAndRetry(connection, depth,
result.getResultCode());
if (retryResult != null)
{
return retryResult;
}
}
return result;
}
}
private LDAPResult reconnectAndRetry(final LDAPConnection connection,
final int depth,
final ResultCode resultCode)
{
try
{
switch (resultCode.intValue())
{
case ResultCode.SERVER_DOWN_INT_VALUE:
case ResultCode.DECODING_ERROR_INT_VALUE:
case ResultCode.CONNECT_ERROR_INT_VALUE:
connection.reconnect();
return processSync(connection, depth, false);
}
}
catch (final Exception e)
{
debugException(e);
}
return null;
}
private LDAPResult followReferral(final LDAPResult referralResult,
final LDAPConnection connection,
final int depth)
throws LDAPException
{
for (final String urlString : referralResult.getReferralURLs())
{
try
{
final LDAPURL referralURL = new LDAPURL(urlString);
final String host = referralURL.getHost();
if (host == null)
{
continue;
}
final DeleteRequest deleteRequest;
if (referralURL.baseDNProvided())
{
deleteRequest = new DeleteRequest(referralURL.getBaseDN(),
getControls());
}
else
{
deleteRequest = this;
}
final LDAPConnection referralConn = connection.getReferralConnector().
getReferralConnection(referralURL, connection);
try
{
return deleteRequest.process(referralConn, depth+1);
}
finally
{
referralConn.setDisconnectInfo(DisconnectType.REFERRAL, null, null);
referralConn.close();
}
}
catch (LDAPException le)
{
debugException(le);
}
}
return referralResult;
}
@InternalUseOnly()
public void responseReceived(final LDAPResponse response)
throws LDAPException
{
try
{
responseQueue.put(response);
}
catch (Exception e)
{
debugException(e);
throw new LDAPException(ResultCode.LOCAL_ERROR,
ERR_EXCEPTION_HANDLING_RESPONSE.get(getExceptionMessage(e)), e);
}
}
@Override()
public int getLastMessageID()
{
return messageID;
}
@Override()
public OperationType getOperationType()
{
return OperationType.DELETE;
}
public DeleteRequest duplicate()
{
return duplicate(getControls());
}
public DeleteRequest duplicate(final Control[] controls)
{
final DeleteRequest r = new DeleteRequest(dn, controls);
if (followReferralsInternal() != null)
{
r.setFollowReferrals(followReferralsInternal());
}
r.setResponseTimeoutMillis(getResponseTimeoutMillis(null));
return r;
}
public LDIFDeleteChangeRecord toLDIFChangeRecord()
{
return new LDIFDeleteChangeRecord(this);
}
public String[] toLDIF()
{
return toLDIFChangeRecord().toLDIF();
}
public String toLDIFString()
{
return toLDIFChangeRecord().toLDIFString();
}
@Override()
public void toString(final StringBuilder buffer)
{
buffer.append("DeleteRequest(dn='");
buffer.append(dn);
buffer.append('\'');
final Control[] controls = getControls();
if (controls.length > 0)
{
buffer.append(", controls={");
for (int i=0; i < controls.length; i++)
{
if (i > 0)
{
buffer.append(", ");
}
buffer.append(controls[i]);
}
buffer.append('}');
}
buffer.append(')');
}
}