| 6ae8d1821822296df0606c9cd1c46708cc21cb58 |
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23-May-2012 |
Dianne Hackborn <hackbod@google.com> |
Fix (mostly) issue #5109947: Race condition between retrieving a...
...content provider and updating its oom adj
This introduces the concept of an "unstable" reference on a content
provider. When holding such a reference (and no normal stable ref),
the content provider dying will not cause the client process to be
killed.
This is used in ContentResolver.query(), .openAssetFileDescriptor(),
and .openTypedAssetFileDescriptor() to first access the provider
with an unstable reference, and if at the point of calling into the
provider we find it is dead then acquiring a new stable reference
and doing the operation again. Thus if the provider process dies
at any point until we get the result back, our own process will not
be killed and we can safely retry the operation.
Arguably there is still the potential for a race -- if somehow the
provider is killed way late by the OOM killer after the query or
open has returned -- but this should now be *extremely* unlikely.
We also continue to have the issue with the other calls, but these
are much less critical, and the same model can't be used there (we
wouldn't want to execute two insert operations for example).
The implementation of this required some significant changes to the
underlying plumbing of content providers, now keeping track of the
two different reference counts, and managing them appropriately. To
facilitate this, the activity manager now has a formal connection
object for a client reference on a content provider, which hands to
the application when opening the provider.
These changes have allowed a lot of the code to be cleaned up and
subtle issues closed. For example, when a process is crashing, we
now have a much better idea of the state of content provider clients
(olding a stable ref, unstable ref, or waiting for it to launch), so
that we can correctly handle each of these.
The client side code is also a fair amount cleaner, though in the
future there is more than should be done. In particular, the two
ProviderClientRecord and ProviderRefCount classes should be combined
into one, part of which is exposed to the ContentResolver internal
API as a reference on a content provider with methods for updating
reference counts and such. Some day we'll do that.
Change-Id: I87b10d1b67573ab899e09ca428f1b556fd669c8c
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 652b6d1e591f6684cda4b93d4712920f287991b4 |
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10-May-2012 |
Dianne Hackborn <hackbod@google.com> |
Add infrastructure for accessing "unstable" content providers.
We have an API and some stuff that purports to this, but no real
implementation yet.
Change-Id: I93555440014a50fdf79fa3f65318d90fb82265b4
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| a7771df3696954f0e279407e8894a916a7cb26cc |
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08-May-2012 |
Jeff Brown <jeffbrown@google.com> |
Move CancellationSignal to android.os package.
Bug: 6427830
Change-Id: I39451bb1e1d4a8d976ed1c671234f0c8c61658dd
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 4c1241df8f8b7fd5ec3dff6c7e0f66271248e76e |
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03-Feb-2012 |
Jeff Brown <jeffbrown@google.com> |
Rename CancellationSignal using preferred spelling.
Bug: 5943637
Change-Id: I12a339f285f4db58e79acb5fd8ec2fc1acda5265
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 75ea64fc54f328d37b115cfb1ded1e45c30380ed |
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26-Jan-2012 |
Jeff Brown <jeffbrown@google.com> |
Implement a cancelation mechanism for queries.
Added new API to enable cancelation of SQLite and content provider
queries by means of a CancelationSignal object. The application
creates a CancelationSignal object and passes it as an argument
to the query. The cancelation signal can then be used to cancel
the query while it is executing.
If the cancelation signal is raised before the query is executed,
then it is immediately terminated.
Change-Id: If2c76e9a7e56ea5e98768b6d4f225f0a1ca61c61
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 23fdaf6fb62a9b5154b2508916a21c678462c5d0 |
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06-Aug-2010 |
Dianne Hackborn <hackbod@google.com> |
Add new ContentProvider for doing conversions to data streams.
This introduces basic infrastructure that should allow content
providers holding complex data to perform on-demand conversion
of their data to streams of various types. It is achieved through
two new content provider APIs, one to interrogate the possible
stream MIME types the provider can return, and the other to
request a stream of data in a particular MIME type.
Because implementations of this will often need to do on-demand
data conversion, there is also a utility intoduced in ContentProvider
for subclasses to easily run a function to write data into a
pipe that is read by the client.
This feature is mostly intended for cut and paste and drag and
drop, as the complex data interchange allowing the source and
destination to negotiate data types and copy (possible large)
data between them. However because it is fundamental facility
of ContentProvider, it can be used in other places, such as for
more advanced GET_CONTENT data exchanges.
An example implementation of this would be in ContactsProvider,
which can now provider a data stream when a client opens certain
pieces of it data, to return data as flat text, a vcard, or other
format.
Change-Id: I58627ea4ed359aa7cf2c66274adb18306c209cb2
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 2ec6c5699181316e5a5c2cd293c006ac4a8bb101 |
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10-Dec-2009 |
Fred Quintana <fredq@google.com> |
am 328c0e79: - removed the concept of Entity from the ContentProvider APIs - removed the parcelling ability from Entity and EntityIterator and made them public - added an EntityIterator abstract implementation that allow easy wrapping of a Cursor - changed the VCard c
Merge commit '328c0e7986aa6bb7752ec6de3da9c999920bb55f' into eclair-mr2-plus-aosp
* commit '328c0e7986aa6bb7752ec6de3da9c999920bb55f':
- removed the concept of Entity from the ContentProvider APIs
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 5bba632d877c2878384ff21566c8eb6a1a22f37b |
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05-Oct-2009 |
Fred Quintana <fredq@google.com> |
- hide Entity and all its references
- remove updateEntity and insertEntity, since they are not
used
- add the RawContacts.Entity class, which is used in lieu of the
android.content.Entity
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 03d9490758c9318cee6d14d3cc5007556dce92d0 |
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22-May-2009 |
Fred Quintana <fredq@google.com> |
- create a new generic ISyncAdapter implementation, SyncAdapterNew
- change the applyBatch to take an ArrayList rather than an []
- change Entity to be a final flass that contains ContentValues
- remove the ability to update/insert Entities by a ContentProviderOperation
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 8943737692169f564cd34a9c8d471f3a5d438712 |
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16-May-2009 |
Fred Quintana <fredq@google.com> |
add ipc support to batching
/frameworks/base/core/java/android/content/ContentProviderClient.java
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| 6a8d5332f00bdfade6674b312e7166940aa28348 |
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08-May-2009 |
Fred Quintana <fredq@google.com> |
content provider entities
/frameworks/base/core/java/android/content/ContentProviderClient.java
|
| 718d8a2d7ff3e864a73879eb646f46c14ab74d07 |
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30-Apr-2009 |
Fred Quintana <fredq@google.com> |
decouple SyncAdapter from ContentProvider
/frameworks/base/core/java/android/content/ContentProviderClient.java
|