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Protect against threading issues in AttachmentDownloadService 

Bug: 3391148
Change-Id: I513b5678815db262ea5660661336432f1e203c9e
This commit is contained in:
Marc Blank 2011-01-26 09:03:11 -08:00
parent a97faa25ac
commit ed9938cd9c
2 changed files with 78 additions and 33 deletions
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51
src/com/android/email/service/AttachmentDownloadService.java
View File

@ -27,7 +27,6 @@ import com.android.email.provider.AttachmentProvider;
import com.android.email.provider.EmailContent;
import com.android.email.provider.EmailContent.Account;
import com.android.email.provider.EmailContent.Attachment;
import com.android.email.provider.EmailContent.AttachmentColumns;
import com.android.email.provider.EmailContent.Message;
import com.android.exchange.ExchangeService;
@ -88,10 +87,12 @@ public class AttachmentDownloadService extends Service implements Runnable {
// Limit on the number of attachments we'll check for background download
private static final int MAX_ATTACHMENTS_TO_CHECK = 25;
/*package*/ static AttachmentDownloadService sRunningService = null;
// sRunningService is only set in the UI thread; it's visibility elsewhere is guaranteed
// by the use of "volatile"
/*package*/ static volatile AttachmentDownloadService sRunningService = null;
/*package*/ Context mContext;
private EmailConnectivityManager mConnectivityManager;
/*package*/ EmailConnectivityManager mConnectivityManager;
/*package*/ final DownloadSet mDownloadSet = new DownloadSet(new DownloadComparator());
@ -247,7 +248,7 @@ public class AttachmentDownloadService extends Service implements Runnable {
* necessary that we detect a deleted attachment, as the code always checks for the
* existence of an attachment before acting on it.
*/
public synchronized void onChange(Attachment att) {
public synchronized void onChange(Context context, Attachment att) {
DownloadRequest req = findDownloadRequest(att.mId);
long priority = getPriority(att);
if (priority == PRIORITY_NONE) {
@ -268,7 +269,7 @@ public class AttachmentDownloadService extends Service implements Runnable {
if (mDownloadsInProgress.containsKey(att.mId)) return;
// If this is new, add the request to the queue
if (req == null) {
req = new DownloadRequest(mContext, att);
req = new DownloadRequest(context, att);
add(req);
}
// If the request already existed, we'll update the priority (so that the time is
@ -693,7 +694,7 @@ public class AttachmentDownloadService extends Service implements Runnable {
}
/*package*/ void onChange(Attachment att) {
mDownloadSet.onChange(att);
mDownloadSet.onChange(this, att);
}
/*package*/ boolean isQueued(long attachmentId) {
@ -721,8 +722,9 @@ public class AttachmentDownloadService extends Service implements Runnable {
* @return the number of items queued for download
*/
public static int getQueueSize() {
if (sRunningService != null) {
return sRunningService.getSize();
AttachmentDownloadService service = sRunningService;
if (service != null) {
return service.getSize();
}
return 0;
}
@ -733,8 +735,9 @@ public class AttachmentDownloadService extends Service implements Runnable {
* @return whether or not the attachment is queued for download
*/
public static boolean isAttachmentQueued(long attachmentId) {
if (sRunningService != null) {
return sRunningService.isQueued(attachmentId);
AttachmentDownloadService service = sRunningService;
if (service != null) {
return service.isQueued(attachmentId);
}
return false;
}
@ -745,15 +748,17 @@ public class AttachmentDownloadService extends Service implements Runnable {
* @return whether or not the attachment was removed from the queue
*/
public static boolean cancelQueuedAttachment(long attachmentId) {
if (sRunningService != null) {
return sRunningService.dequeue(attachmentId);
AttachmentDownloadService service = sRunningService;
if (service != null) {
return service.dequeue(attachmentId);
}
return false;
}
public static void watchdogAlarm() {
if (sRunningService != null) {
sRunningService.mDownloadSet.onWatchdogAlarm();
AttachmentDownloadService service = sRunningService;
if (service != null) {
service.mDownloadSet.onWatchdogAlarm();
}
}
@ -763,17 +768,18 @@ public class AttachmentDownloadService extends Service implements Runnable {
* @param flags the new flags for the attachment
*/
public static void attachmentChanged(final long id, final int flags) {
if (sRunningService == null) return;
final AttachmentDownloadService service = sRunningService;
if (service == null) return;
Utility.runAsync(new Runnable() {
public void run() {
final Attachment attachment =
Attachment.restoreAttachmentWithId(sRunningService, id);
Attachment.restoreAttachmentWithId(service, id);
if (attachment != null) {
// Store the flags we got from EmailProvider; given that all of this
// activity is asynchronous, we need to use the newest data from
// EmailProvider
attachment.mFlags = flags;
sRunningService.onChange(attachment);
service.onChange(attachment);
}
}});
}
@ -832,7 +838,9 @@ public class AttachmentDownloadService extends Service implements Runnable {
}
public void run() {
// These fields are only used within the service thread
mContext = this;
mConnectivityManager = new EmailConnectivityManager(this, TAG);
mAccountManagerStub = new AccountManagerStub(this);
// Run through all attachments in the database that require download and add them to
@ -847,7 +855,7 @@ public class AttachmentDownloadService extends Service implements Runnable {
Attachment attachment = Attachment.restoreAttachmentWithId(
this, c.getLong(EmailContent.ID_PROJECTION_COLUMN));
if (attachment != null) {
mDownloadSet.onChange(attachment);
mDownloadSet.onChange(this, attachment);
}
}
} catch (Exception e) {
@ -869,6 +877,9 @@ public class AttachmentDownloadService extends Service implements Runnable {
}
}
}
// Unregister now that we're done
mConnectivityManager.unregister();
}
@Override
@ -885,7 +896,6 @@ public class AttachmentDownloadService extends Service implements Runnable {
*/
@Override
public void onCreate() {
mConnectivityManager = new EmailConnectivityManager(this, TAG);
// Start up our service thread
new Thread(this, "AttachmentDownloadService").start();
}
@ -902,7 +912,6 @@ public class AttachmentDownloadService extends Service implements Runnable {
kick();
}
sRunningService = null;
mConnectivityManager.unregister();
}
@Override
@ -918,7 +927,7 @@ public class AttachmentDownloadService extends Service implements Runnable {
pw.println(" Account: " + req.accountId + ", Attachment: " + req.attachmentId);
pw.println(" Priority: " + req.priority + ", Time: " + req.time +
(req.inProgress ? " [In progress]" : ""));
Attachment att = Attachment.restoreAttachmentWithId(mContext, req.attachmentId);
Attachment att = Attachment.restoreAttachmentWithId(this, req.attachmentId);
if (att == null) {
pw.println(" Attachment not in database?");
} else if (att.mFileName != null) {

60
tests/src/com/android/email/service/AttachmentDownloadServiceTests.java
View File

@ -17,6 +17,7 @@
package com.android.email.service;
import com.android.email.AccountTestCase;
import com.android.email.EmailConnectivityManager;
import com.android.email.ExchangeUtils.NullEmailService;
import com.android.email.provider.EmailContent.Account;
import com.android.email.provider.EmailContent.Attachment;
@ -56,8 +57,10 @@ public class AttachmentDownloadServiceTests extends AccountTestCase {
// Set up an account and mailbox
mAccount = ProviderTestUtils.setupAccount("account", false, mMockContext);
mAccount.mFlags |= Account.FLAGS_BACKGROUND_ATTACHMENTS;
mAccount.save(mMockContext);
mAccountId = mAccount.mId;
mMailbox = ProviderTestUtils.setupMailbox("mailbox", mAccountId, true, mMockContext);
mMailboxId = mMailbox.mId;
@ -68,6 +71,7 @@ public class AttachmentDownloadServiceTests extends AccountTestCase {
mService.addServiceClass(mAccountId, NullEmailService.class);
mAccountManagerStub = new AttachmentDownloadService.AccountManagerStub(null);
mService.mAccountManagerStub = mAccountManagerStub;
mService.mConnectivityManager = new MockConnectivityManager(getContext(), "mock");
mDownloadSet = mService.mDownloadSet;
mMockDirectory =
new MockDirectory(mService.mContext.getCacheDir().getAbsolutePath());
@ -96,10 +100,10 @@ public class AttachmentDownloadServiceTests extends AccountTestCase {
Attachment att4 = ProviderTestUtils.setupAttachment(message.mId, "filename4", 1000,
Attachment.FLAG_DOWNLOAD_USER_REQUEST, true, mMockContext);
// Indicate that these attachments have changed; they will be added to the queue
mDownloadSet.onChange(att1);
mDownloadSet.onChange(att2);
mDownloadSet.onChange(att3);
mDownloadSet.onChange(att4);
mDownloadSet.onChange(mMockContext, att1);
mDownloadSet.onChange(mMockContext, att2);
mDownloadSet.onChange(mMockContext, att3);
mDownloadSet.onChange(mMockContext, att4);
Iterator<DownloadRequest> iterator = mDownloadSet.descendingIterator();
// Check the expected ordering; 1 & 4 are higher priority than 2 & 3
// 1 and 3 were created earlier than their priority equals
@ -156,7 +160,7 @@ public class AttachmentDownloadServiceTests extends AccountTestCase {
* A mock file directory containing a single (Mock)File. The total space, usable space, and
* length of the single file can be set
*/
static class MockDirectory extends File {
private static class MockDirectory extends File {
private static final long serialVersionUID = 1L;
private long mTotalSpace;
private long mUsableSpace;
@ -195,7 +199,7 @@ public class AttachmentDownloadServiceTests extends AccountTestCase {
/**
* A mock file that reports back a pre-set length
*/
static class MockFile extends File {
private static class MockFile extends File {
private static final long serialVersionUID = 1L;
private long mLength = 0;
@ -208,6 +212,21 @@ public class AttachmentDownloadServiceTests extends AccountTestCase {
}
}
private static class MockConnectivityManager extends EmailConnectivityManager {
public MockConnectivityManager(Context context, String name) {
super(context, name);
}
@Override
public void waitForConnectivity() {
}
@Override
public boolean isBackgroundDataAllowed() {
return true;
}
}
public void testCanPrefetchForAccount() {
// First, test our "global" limits (based on free storage)
// Mock storage @ 100 total and 26 available
@ -216,24 +235,41 @@ public class AttachmentDownloadServiceTests extends AccountTestCase {
// Mock 2 accounts in total
mAccountManagerStub.setNumberOfAccounts(2);
// With 26% available, we should be ok to prefetch
assertTrue(mService.canPrefetchForAccount(1, mMockDirectory));
assertTrue(mService.canPrefetchForAccount(mAccountId, mMockDirectory));
// Now change to 24 available
mMockDirectory.setTotalAndUsableSpace(100L, 24L);
// With 24% available, we should NOT be ok to prefetch
assertFalse(mService.canPrefetchForAccount(1, mMockDirectory));
assertFalse(mService.canPrefetchForAccount(mAccountId, mMockDirectory));
// Now, test per-account storage
// Mock storage @ 100 total and 50 available
mMockDirectory.setTotalAndUsableSpace(100L, 50L);
// Mock a file of length 12, but need to uncache previous amount first
mService.mAttachmentStorageMap.remove(1L);
mService.mAttachmentStorageMap.remove(mAccountId);
mMockDirectory.setFileLength(11);
// We can prefetch since 11 < 50/4
assertTrue(mService.canPrefetchForAccount(1, mMockDirectory));
assertTrue(mService.canPrefetchForAccount(mAccountId, mMockDirectory));
// Mock a file of length 13, but need to uncache previous amount first
mService.mAttachmentStorageMap.remove(1L);
mService.mAttachmentStorageMap.remove(mAccountId);
mMockDirectory.setFileLength(13);
// We can't prefetch since 13 > 50/4
assertFalse(mService.canPrefetchForAccount(1, mMockDirectory));
assertFalse(mService.canPrefetchForAccount(mAccountId, mMockDirectory));
}
public void testCanPrefetchForAccountNoBackgroundDownload() {
Account account = ProviderTestUtils.setupAccount("account2", false, mMockContext);
account.mFlags &= ~Account.FLAGS_BACKGROUND_ATTACHMENTS;
account.save(mMockContext);
// First, test our "global" limits (based on free storage)
// Mock storage @ 100 total and 26 available
// Note that all file lengths in this test are in arbitrary units
mMockDirectory.setTotalAndUsableSpace(100L, 26L);
// Mock 2 accounts in total
mAccountManagerStub.setNumberOfAccounts(2);
// With 26% available, we should be ok to prefetch,
// *but* bg download is disabled on the account.
assertFalse(mService.canPrefetchForAccount(account.mId, mMockDirectory));
}
}