Fix root cause of #1077

When importing lots of keys, lots of messages about the status of keys
is generated, including some debug slime and general fluff that
isn't really needed a lot of the time. As a result, a serious bug can come
along after key imports or certain operations which cause a log to become
parceled.

This commit implements a pool to "dehydrate" logs into: they are placed
into the pool (a ConcurrentHashMap) and a UUID assigned to them, which
is parceled along. When the OperationResult is un-parceled, it reads in
the appropriate UUID bits and rehydrates the appropriate log.

In order to avoid any memory leaks, the log pool removes a reference to
the log itself, allowing the log to die a natural death at the hands
of the GC..
This commit is contained in:
Morgan Gangwere 2015-03-03 00:51:44 -07:00
parent 1a12eb1a7a
commit 73a1ceb732
1 changed files with 70 additions and 6 deletions

View File

@ -38,6 +38,8 @@ import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
/** Represent the result of an operation.
*
@ -52,6 +54,63 @@ public abstract class OperationResult implements Parcelable {
public static final String EXTRA_RESULT = "operation_result";
/**
* A HashMap of UUID:OperationLog which contains logs that we don't need
* to care about. This is used such that when we become parceled, we are
* well below the 1Mbit boundary that is specified.
*/
private static ConcurrentHashMap<UUID, OperationLog> dehydratedLogs;
static {
// Static initializer for ConcurrentHashMap
dehydratedLogs = new ConcurrentHashMap<UUID,OperationLog>();
}
/**
* Dehydrate a log (such that it is available after deparcelization)
*
* Returns the NULL uuid (0) if you hand it null.
* @param log An OperationLog to dehydrate
* @return a UUID, the ticket for your dehydrated log
*
*/
private static UUID dehydrateLog(OperationLog log) {
if(log == null) {
return new UUID(0,0);
}
else {
UUID ticket = UUID.randomUUID();
dehydratedLogs.put(ticket, log);
return ticket;
}
}
/***
* Rehydrate a log after going through parcelization, invalidating its place in the
* dehydration pool.
* This is used such that when parcelized, the parcel is no larger than 1mbit.
* @param ticket A UUID ticket that identifies the log in question.
* @return An OperationLog.
*/
private static OperationLog rehydrateLog(UUID ticket) {
if(ticket.getMostSignificantBits() == 0 && ticket.getLeastSignificantBits() == 0) {
return null;
}
else
{
OperationLog log = dehydratedLogs.get(ticket);
invalidateDehydrateTicket(ticket);
return log;
}
}
private static void invalidateDehydrateTicket(UUID ticket) {
if(ticket.getLeastSignificantBits() != 0 && ticket.getMostSignificantBits() != 0
&& dehydratedLogs.containsKey(ticket))
{
dehydratedLogs.remove(ticket);
}
}
/** Holds the overall result, the number specifying varying degrees of success:
* - The first bit is 0 on overall success, 1 on overall failure
* - The second bit indicates if the action was cancelled - may still be an error or success!
@ -65,7 +124,7 @@ public abstract class OperationResult implements Parcelable {
public static final int RESULT_WARNINGS = 4;
/// A list of log entries tied to the operation result.
final OperationLog mLog;
protected OperationLog mLog;
public OperationResult(int result, OperationLog log) {
mResult = result;
@ -74,8 +133,11 @@ public abstract class OperationResult implements Parcelable {
public OperationResult(Parcel source) {
mResult = source.readInt();
mLog = new OperationLog();
mLog.addAll(source.createTypedArrayList(LogEntryParcel.CREATOR));
long mostSig = source.readLong();
long leastSig = source.readLong();
UUID mTicket = new UUID(mostSig, leastSig);
// fetch the dehydrated log out of storage (this removes it from the dehydration pool)
mLog = rehydrateLog(mTicket);
}
public int getResult() {
@ -739,9 +801,11 @@ public abstract class OperationResult implements Parcelable {
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(mResult);
if (mLog != null) {
dest.writeTypedList(mLog.toList());
}
// Get a ticket for our log.
UUID mTicket = dehydrateLog(mLog);
// And write out the UUID most and least significant bits.
dest.writeLong(mTicket.getMostSignificantBits());
dest.writeLong(mTicket.getLeastSignificantBits());
}
public static class OperationLog implements Iterable<LogEntryParcel> {