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/*
* Copyright 2008-2019 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright (C) 2008-2019 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.ldap.sdk;
import java.io.Serializable;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import com.unboundid.util.Debug;
import com.unboundid.util.NotMutable;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import static com.unboundid.ldap.sdk.LDAPMessages.*;
/**
* This class defines an object that provides information about a request that
* was initiated asynchronously. It may be used to abandon or cancel the
* associated request. This class also implements the
* {@code java.util.concurrent.Future} interface, so it may be used in that
* manner.
*
*
Example
* The following example initiates an asynchronous modify operation and then
* attempts to abandon it:
*
* Modification mod = new Modification(ModificationType.REPLACE,
* "description", "This is the new description.");
* ModifyRequest modifyRequest =
* new ModifyRequest("dc=example,dc=com", mod);
*
* AsyncRequestID asyncRequestID =
* connection.asyncModify(modifyRequest, myAsyncResultListener);
*
* // Assume that we've waited a reasonable amount of time but the modify
* // hasn't completed yet so we'll try to abandon it.
*
* connection.abandon(asyncRequestID);
*
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class AsyncRequestID
implements Serializable, Future
{
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = 8244005138437962030L;
// The queue used to receive the result for the associated operation.
private final ArrayBlockingQueue resultQueue;
// A flag indicating whether a request has been made to cancel the operation.
private final AtomicBoolean cancelRequested;
// The result for the associated operation.
private final AtomicReference result;
// The message ID for the request message.
private final int messageID;
// The connection used to process the asynchronous operation.
private final LDAPConnection connection;
// The timer task that will allow the associated request to be cancelled.
private volatile AsyncTimeoutTimerTask timerTask;
/**
* Creates a new async request ID with the provided message ID.
*
* @param messageID The message ID for the associated request.
* @param connection The connection used to process the asynchronous
* operation.
*/
AsyncRequestID(final int messageID, final LDAPConnection connection)
{
this.messageID = messageID;
this.connection = connection;
resultQueue = new ArrayBlockingQueue<>(1);
cancelRequested = new AtomicBoolean(false);
result = new AtomicReference<>();
timerTask = null;
}
/**
* Retrieves the message ID for the associated request.
*
* @return The message ID for the associated request.
*/
public int getMessageID()
{
return messageID;
}
/**
* Attempts to cancel the associated asynchronous operation operation. This
* will cause an abandon request to be sent to the server for the associated
* request, but because there is no response to an abandon operation then
* there is no way that we can determine whether the operation was actually
* abandoned.
*
* @param mayInterruptIfRunning Indicates whether to interrupt the thread
* running the associated task. This will be
* ignored.
*
* @return {@code true} if an abandon request was sent to cancel the
* associated operation, or {@code false} if it was not possible to
* send an abandon request because the operation has already
* completed, because an abandon request has already been sent, or
* because an error occurred while trying to send the cancel request.
*/
@Override()
public boolean cancel(final boolean mayInterruptIfRunning)
{
// If the operation has already completed, then we can't cancel it.
if (isDone())
{
return false;
}
// Try to send a request to cancel the operation.
try
{
cancelRequested.set(true);
result.compareAndSet(null,
new LDAPResult(messageID, ResultCode.USER_CANCELED,
INFO_ASYNC_REQUEST_USER_CANCELED.get(), null,
StaticUtils.NO_STRINGS, StaticUtils.NO_CONTROLS));
connection.abandon(this);
}
catch (final Exception e)
{
Debug.debugException(e);
}
return true;
}
/**
* Indicates whether an attempt has been made to cancel the associated
* operation before it completed.
*
* @return {@code true} if an attempt was made to cancel the operation, or
* {@code false} if no cancel attempt was made, or if the operation
* completed before it could be canceled.
*/
@Override()
public boolean isCancelled()
{
return cancelRequested.get();
}
/**
* Indicates whether the associated operation has completed, regardless of
* whether it completed normally, completed with an error, or was canceled
* before starting.
*
* @return {@code true} if the associated operation has completed, or if an
* attempt has been made to cancel it, or {@code false} if the
* operation has not yet completed and no cancel attempt has been
* made.
*/
@Override()
public boolean isDone()
{
if (cancelRequested.get())
{
return true;
}
if (result.get() != null)
{
return true;
}
final LDAPResult newResult = resultQueue.poll();
if (newResult != null)
{
result.set(newResult);
return true;
}
return false;
}
/**
* Attempts to get the result for the associated operation, waiting if
* necessary for it to complete. Note that this method will differ from the
* behavior defined in the {@code java.util.concurrent.Future} API in that it
* will not wait forever. Rather, it will wait for no more than the length of
* time specified as the maximum response time defined in the connection
* options for the connection used to send the asynchronous request. This is
* necessary because the operation may have been abandoned or otherwise
* interrupted, or the associated connection may have become invalidated, in
* a way that the LDAP SDK cannot detect.
*
* @return The result for the associated operation. If the operation has
* been canceled, or if no result has been received within the
* response timeout period, then a generated response will be
* returned.
*
* @throws InterruptedException If the thread calling this method was
* interrupted before a result was received.
*/
@Override()
public LDAPResult get()
throws InterruptedException
{
final long maxWaitTime =
connection.getConnectionOptions().getResponseTimeoutMillis();
try
{
return get(maxWaitTime, TimeUnit.MILLISECONDS);
}
catch (final TimeoutException te)
{
Debug.debugException(te);
return new LDAPResult(messageID, ResultCode.TIMEOUT, te.getMessage(),
null, StaticUtils.NO_STRINGS, StaticUtils.NO_CONTROLS);
}
}
/**
* Attempts to get the result for the associated operation, waiting if
* necessary for up to the specified length of time for the operation to
* complete.
*
* @param timeout The maximum length of time to wait for the response.
* @param timeUnit The time unit for the provided {@code timeout} value.
*
* @return The result for the associated operation. If the operation has
* been canceled, then a generated response will be returned.
*
* @throws InterruptedException If the thread calling this method was
* interrupted before a result was received.
*
* @throws TimeoutException If a timeout was encountered before the result
* could be obtained.
*/
@Override()
public LDAPResult get(final long timeout, final TimeUnit timeUnit)
throws InterruptedException, TimeoutException
{
final LDAPResult newResult = resultQueue.poll();
if (newResult != null)
{
result.set(newResult);
return newResult;
}
final LDAPResult previousResult = result.get();
if (previousResult != null)
{
return previousResult;
}
final LDAPResult resultAfterWaiting = resultQueue.poll(timeout, timeUnit);
if (resultAfterWaiting == null)
{
final long timeoutMillis = timeUnit.toMillis(timeout);
throw new TimeoutException(
WARN_ASYNC_REQUEST_GET_TIMEOUT.get(timeoutMillis));
}
else
{
result.set(resultAfterWaiting);
return resultAfterWaiting;
}
}
/**
* Sets the timer task that may be used to cancel this result after a period
* of time.
*
* @param timerTask The timer task that may be used to cancel this result
* after a period of time. It may be {@code null} if no
* timer task should be used.
*/
void setTimerTask(final AsyncTimeoutTimerTask timerTask)
{
this.timerTask = timerTask;
}
/**
* Sets the result for the associated operation.
*
* @param result The result for the associated operation. It must not be
* {@code null}.
*/
void setResult(final LDAPResult result)
{
resultQueue.offer(result);
final AsyncTimeoutTimerTask t = timerTask;
if (t != null)
{
t.cancel();
connection.getTimer().purge();
timerTask = null;
}
}
/**
* Retrieves a hash code for this async request ID.
*
* @return A hash code for this async request ID.
*/
@Override()
public int hashCode()
{
return messageID;
}
/**
* Indicates whether the provided object is equal to this async request ID.
*
* @param o The object for which to make the determination.
*
* @return {@code true} if the provided object is equal to this async request
* ID, or {@code false} if not.
*/
@Override()
public boolean equals(final Object o)
{
if (o == null)
{
return false;
}
if (o == this)
{
return true;
}
if (o instanceof AsyncRequestID)
{
return (((AsyncRequestID) o).messageID == messageID);
}
else
{
return false;
}
}
/**
* Retrieves a string representation of this async request ID.
*
* @return A string representation of this async request ID.
*/
@Override()
public String toString()
{
return "AsyncRequestID(messageID=" + messageID + ')';
}
}
