bb68c13afa
This reduces the tombstone down by 100K A follow-on cl will remove the unused resources from the tombstone build Bug: 17414014 Change-Id: I5d38811b17a5273ec726e750ab123e10e36cee04
823 lines
29 KiB
Java
823 lines
29 KiB
Java
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.android.email.provider;
|
|
|
|
import android.content.ContentValues;
|
|
import android.database.CrossProcessCursor;
|
|
import android.database.Cursor;
|
|
import android.database.CursorWindow;
|
|
import android.database.CursorWrapper;
|
|
import android.database.MatrixCursor;
|
|
import android.net.Uri;
|
|
import android.util.LruCache;
|
|
|
|
import com.android.email.DebugUtils;
|
|
import com.android.mail.utils.LogUtils;
|
|
import com.android.mail.utils.MatrixCursorWithCachedColumns;
|
|
import com.google.common.annotations.VisibleForTesting;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.Arrays;
|
|
import java.util.HashMap;
|
|
import java.util.Map;
|
|
import java.util.Set;
|
|
|
|
/**
|
|
* An LRU cache for EmailContent (Account, HostAuth, Mailbox, and Message, thus far). The intended
|
|
* user of this cache is EmailProvider itself; caching is entirely transparent to users of the
|
|
* provider.
|
|
*
|
|
* Usage examples; id is a String representation of a row id (_id), as it might be retrieved from
|
|
* a uri via getPathSegment
|
|
*
|
|
* To create a cache:
|
|
* ContentCache cache = new ContentCache(name, projection, max);
|
|
*
|
|
* To (try to) get a cursor from a cache:
|
|
* Cursor cursor = cache.getCursor(id, projection);
|
|
*
|
|
* To read from a table and cache the resulting cursor:
|
|
* 1. Get a CacheToken: CacheToken token = cache.getToken(id);
|
|
* 2. Get a cursor from the database: Cursor cursor = db.query(....);
|
|
* 3. Put the cursor in the cache: cache.putCursor(cursor, id, token);
|
|
* Only cursors with the projection given in the definition of the cache can be cached
|
|
*
|
|
* To delete one or more rows or update multiple rows from a table that uses cached data:
|
|
* 1. Lock the row in the cache: cache.lock(id);
|
|
* 2. Delete/update the row(s): db.delete(...);
|
|
* 3. Invalidate any other caches that might be affected by the delete/update:
|
|
* The entire cache: affectedCache.invalidate()*
|
|
* A specific row in a cache: affectedCache.invalidate(rowId)
|
|
* 4. Unlock the row in the cache: cache.unlock(id);
|
|
*
|
|
* To update a single row from a table that uses cached data:
|
|
* 1. Lock the row in the cache: cache.lock(id);
|
|
* 2. Update the row: db.update(...);
|
|
* 3. Unlock the row in the cache, passing in the new values: cache.unlock(id, values);
|
|
*
|
|
* Synchronization note: All of the public methods in ContentCache are synchronized (i.e. on the
|
|
* cache itself) except for methods that are solely used for debugging and do not modify the cache.
|
|
* All references to ContentCache that are external to the ContentCache class MUST synchronize on
|
|
* the ContentCache instance (e.g. CachedCursor.close())
|
|
*/
|
|
public final class ContentCache {
|
|
private static final boolean DEBUG_CACHE = false; // DO NOT CHECK IN TRUE
|
|
private static final boolean DEBUG_TOKENS = false; // DO NOT CHECK IN TRUE
|
|
private static final boolean DEBUG_NOT_CACHEABLE = false; // DO NOT CHECK IN TRUE
|
|
private static final boolean DEBUG_STATISTICS = false; // DO NOT CHECK THIS IN TRUE
|
|
|
|
// If false, reads will not use the cache; this is intended for debugging only
|
|
private static final boolean READ_CACHE_ENABLED = true; // DO NOT CHECK IN FALSE
|
|
|
|
// Count of non-cacheable queries (debug only)
|
|
private static int sNotCacheable = 0;
|
|
// A map of queries that aren't cacheable (debug only)
|
|
private static final CounterMap<String> sNotCacheableMap = new CounterMap<String>();
|
|
|
|
private final LruCache<String, Cursor> mLruCache;
|
|
|
|
// All defined caches
|
|
private static final ArrayList<ContentCache> sContentCaches = new ArrayList<ContentCache>();
|
|
// A set of all unclosed, cached cursors; this will typically be a very small set, as cursors
|
|
// tend to be closed quickly after use. The value, for each cursor, is its reference count
|
|
/*package*/ static final CounterMap<Cursor> sActiveCursors = new CounterMap<Cursor>(24);
|
|
|
|
// A set of locked content id's
|
|
private final CounterMap<String> mLockMap = new CounterMap<String>(4);
|
|
// A set of active tokens
|
|
/*package*/ TokenList mTokenList;
|
|
|
|
// The name of the cache (used for logging)
|
|
private final String mName;
|
|
// The base projection (only queries in which all columns exist in this projection will be
|
|
// able to avoid a cache miss)
|
|
private final String[] mBaseProjection;
|
|
// The tag used for logging
|
|
private final String mLogTag;
|
|
// Cache statistics
|
|
private final Statistics mStats;
|
|
/** If {@code true}, lock the cache for all writes */
|
|
private static boolean sLockCache;
|
|
|
|
/**
|
|
* A synchronized reference counter for arbitrary objects
|
|
*/
|
|
/*package*/ static class CounterMap<T> {
|
|
private HashMap<T, Integer> mMap;
|
|
|
|
/*package*/ CounterMap(int maxSize) {
|
|
mMap = new HashMap<T, Integer>(maxSize);
|
|
}
|
|
|
|
/*package*/ CounterMap() {
|
|
mMap = new HashMap<T, Integer>();
|
|
}
|
|
|
|
/*package*/ synchronized int subtract(T object) {
|
|
Integer refCount = mMap.get(object);
|
|
int newCount;
|
|
if (refCount == null || refCount.intValue() == 0) {
|
|
throw new IllegalStateException();
|
|
}
|
|
if (refCount > 1) {
|
|
newCount = refCount - 1;
|
|
mMap.put(object, newCount);
|
|
} else {
|
|
newCount = 0;
|
|
mMap.remove(object);
|
|
}
|
|
return newCount;
|
|
}
|
|
|
|
/*package*/ synchronized void add(T object) {
|
|
Integer refCount = mMap.get(object);
|
|
if (refCount == null) {
|
|
mMap.put(object, 1);
|
|
} else {
|
|
mMap.put(object, refCount + 1);
|
|
}
|
|
}
|
|
|
|
/*package*/ synchronized boolean contains(T object) {
|
|
return mMap.containsKey(object);
|
|
}
|
|
|
|
/*package*/ synchronized int getCount(T object) {
|
|
Integer refCount = mMap.get(object);
|
|
return (refCount == null) ? 0 : refCount.intValue();
|
|
}
|
|
|
|
synchronized int size() {
|
|
return mMap.size();
|
|
}
|
|
|
|
/**
|
|
* For Debugging Only - not efficient
|
|
*/
|
|
synchronized Set<Map.Entry<T, Integer>> entrySet() {
|
|
return mMap.entrySet();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A list of tokens that are in use at any moment; there can be more than one token for an id
|
|
*/
|
|
/*package*/ static class TokenList extends ArrayList<CacheToken> {
|
|
private static final long serialVersionUID = 1L;
|
|
private final String mLogTag;
|
|
|
|
/*package*/ TokenList(String name) {
|
|
mLogTag = "TokenList-" + name;
|
|
}
|
|
|
|
/*package*/ int invalidateTokens(String id) {
|
|
if (DebugUtils.DEBUG && DEBUG_TOKENS) {
|
|
LogUtils.d(mLogTag, "============ Invalidate tokens for: " + id);
|
|
}
|
|
ArrayList<CacheToken> removeList = new ArrayList<CacheToken>();
|
|
int count = 0;
|
|
for (CacheToken token: this) {
|
|
if (token.getId().equals(id)) {
|
|
token.invalidate();
|
|
removeList.add(token);
|
|
count++;
|
|
}
|
|
}
|
|
for (CacheToken token: removeList) {
|
|
remove(token);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/*package*/ void invalidate() {
|
|
if (DebugUtils.DEBUG && DEBUG_TOKENS) {
|
|
LogUtils.d(mLogTag, "============ List invalidated");
|
|
}
|
|
for (CacheToken token: this) {
|
|
token.invalidate();
|
|
}
|
|
clear();
|
|
}
|
|
|
|
/*package*/ boolean remove(CacheToken token) {
|
|
boolean result = super.remove(token);
|
|
if (DebugUtils.DEBUG && DEBUG_TOKENS) {
|
|
if (result) {
|
|
LogUtils.d(mLogTag, "============ Removing token for: " + token.mId);
|
|
} else {
|
|
LogUtils.d(mLogTag, "============ No token found for: " + token.mId);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public CacheToken add(String id) {
|
|
CacheToken token = new CacheToken(id);
|
|
super.add(token);
|
|
if (DebugUtils.DEBUG && DEBUG_TOKENS) {
|
|
LogUtils.d(mLogTag, "============ Taking token for: " + token.mId);
|
|
}
|
|
return token;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A CacheToken is an opaque object that must be passed into putCursor in order to attempt to
|
|
* write into the cache. The token becomes invalidated by any intervening write to the cached
|
|
* record.
|
|
*/
|
|
public static final class CacheToken {
|
|
private final String mId;
|
|
private boolean mIsValid = READ_CACHE_ENABLED;
|
|
|
|
/*package*/ CacheToken(String id) {
|
|
mId = id;
|
|
}
|
|
|
|
/*package*/ String getId() {
|
|
return mId;
|
|
}
|
|
|
|
/*package*/ boolean isValid() {
|
|
return mIsValid;
|
|
}
|
|
|
|
/*package*/ void invalidate() {
|
|
mIsValid = false;
|
|
}
|
|
|
|
@Override
|
|
public boolean equals(Object token) {
|
|
return ((token instanceof CacheToken) && ((CacheToken)token).mId.equals(mId));
|
|
}
|
|
|
|
@Override
|
|
public int hashCode() {
|
|
return mId.hashCode();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The cached cursor is simply a CursorWrapper whose underlying cursor contains zero or one
|
|
* rows. We handle simple movement (moveToFirst(), moveToNext(), etc.), and override close()
|
|
* to keep the underlying cursor alive (unless it's no longer cached due to an invalidation).
|
|
* Multiple CachedCursor's can use the same underlying cursor, so we override the various
|
|
* moveX methods such that each CachedCursor can have its own position information
|
|
*/
|
|
public static final class CachedCursor extends CursorWrapper implements CrossProcessCursor {
|
|
// The cursor we're wrapping
|
|
private final Cursor mCursor;
|
|
// The cache which generated this cursor
|
|
private final ContentCache mCache;
|
|
private final String mId;
|
|
// The current position of the cursor (can only be 0 or 1)
|
|
private int mPosition = -1;
|
|
// The number of rows in this cursor (-1 = not determined)
|
|
private int mCount = -1;
|
|
private boolean isClosed = false;
|
|
|
|
public CachedCursor(Cursor cursor, ContentCache cache, String id) {
|
|
super(cursor);
|
|
mCursor = cursor;
|
|
mCache = cache;
|
|
mId = id;
|
|
// Add this to our set of active cursors
|
|
sActiveCursors.add(cursor);
|
|
}
|
|
|
|
/**
|
|
* Close this cursor; if the cursor's cache no longer contains the underlying cursor, and
|
|
* there are no other users of that cursor, we'll close it here. In any event,
|
|
* we'll remove the cursor from our set of active cursors.
|
|
*/
|
|
@Override
|
|
public void close() {
|
|
synchronized(mCache) {
|
|
int count = sActiveCursors.subtract(mCursor);
|
|
if ((count == 0) && mCache.mLruCache.get(mId) != (mCursor)) {
|
|
super.close();
|
|
}
|
|
}
|
|
isClosed = true;
|
|
}
|
|
|
|
@Override
|
|
public boolean isClosed() {
|
|
return isClosed;
|
|
}
|
|
|
|
@Override
|
|
public int getCount() {
|
|
if (mCount < 0) {
|
|
mCount = super.getCount();
|
|
}
|
|
return mCount;
|
|
}
|
|
|
|
/**
|
|
* We'll be happy to move to position 0 or -1
|
|
*/
|
|
@Override
|
|
public boolean moveToPosition(int pos) {
|
|
if (pos >= getCount() || pos < -1) {
|
|
return false;
|
|
}
|
|
mPosition = pos;
|
|
return true;
|
|
}
|
|
|
|
@Override
|
|
public boolean moveToFirst() {
|
|
return moveToPosition(0);
|
|
}
|
|
|
|
@Override
|
|
public boolean moveToNext() {
|
|
return moveToPosition(mPosition + 1);
|
|
}
|
|
|
|
@Override
|
|
public boolean moveToPrevious() {
|
|
return moveToPosition(mPosition - 1);
|
|
}
|
|
|
|
@Override
|
|
public int getPosition() {
|
|
return mPosition;
|
|
}
|
|
|
|
@Override
|
|
public final boolean move(int offset) {
|
|
return moveToPosition(mPosition + offset);
|
|
}
|
|
|
|
@Override
|
|
public final boolean moveToLast() {
|
|
return moveToPosition(getCount() - 1);
|
|
}
|
|
|
|
@Override
|
|
public final boolean isLast() {
|
|
return mPosition == (getCount() - 1);
|
|
}
|
|
|
|
@Override
|
|
public final boolean isBeforeFirst() {
|
|
return mPosition == -1;
|
|
}
|
|
|
|
@Override
|
|
public final boolean isAfterLast() {
|
|
return mPosition == 1;
|
|
}
|
|
|
|
@Override
|
|
public CursorWindow getWindow() {
|
|
return ((CrossProcessCursor)mCursor).getWindow();
|
|
}
|
|
|
|
@Override
|
|
public void fillWindow(int pos, CursorWindow window) {
|
|
((CrossProcessCursor)mCursor).fillWindow(pos, window);
|
|
}
|
|
|
|
@Override
|
|
public boolean onMove(int oldPosition, int newPosition) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Public constructor
|
|
* @param name the name of the cache (used for logging)
|
|
* @param baseProjection the projection used for cached cursors; queries whose columns are not
|
|
* included in baseProjection will always generate a cache miss
|
|
* @param maxSize the maximum number of content cursors to cache
|
|
*/
|
|
public ContentCache(String name, String[] baseProjection, int maxSize) {
|
|
mName = name;
|
|
mLruCache = new LruCache<String, Cursor>(maxSize) {
|
|
@Override
|
|
protected void entryRemoved(
|
|
boolean evicted, String key, Cursor oldValue, Cursor newValue) {
|
|
// Close this cursor if it's no longer being used
|
|
if (evicted && !sActiveCursors.contains(oldValue)) {
|
|
oldValue.close();
|
|
}
|
|
}
|
|
};
|
|
mBaseProjection = baseProjection;
|
|
mLogTag = "ContentCache-" + name;
|
|
sContentCaches.add(this);
|
|
mTokenList = new TokenList(mName);
|
|
mStats = new Statistics(this);
|
|
}
|
|
|
|
/**
|
|
* Return the base projection for cached rows
|
|
* Get the projection used for cached rows (typically, the largest possible projection)
|
|
* @return
|
|
*/
|
|
public String[] getProjection() {
|
|
return mBaseProjection;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get a CacheToken for a row as specified by its id (_id column)
|
|
* @param id the id of the record
|
|
* @return a CacheToken needed in order to write data for the record back to the cache
|
|
*/
|
|
public synchronized CacheToken getCacheToken(String id) {
|
|
// If another thread is already writing the data, return an invalid token
|
|
CacheToken token = mTokenList.add(id);
|
|
if (mLockMap.contains(id)) {
|
|
token.invalidate();
|
|
}
|
|
return token;
|
|
}
|
|
|
|
public int size() {
|
|
return mLruCache.size();
|
|
}
|
|
|
|
@VisibleForTesting
|
|
Cursor get(String id) {
|
|
return mLruCache.get(id);
|
|
}
|
|
|
|
protected Map<String, Cursor> getSnapshot() {
|
|
return mLruCache.snapshot();
|
|
}
|
|
/**
|
|
* Try to cache a cursor for the given id and projection; returns a valid cursor, either a
|
|
* cached cursor (if caching was successful) or the original cursor
|
|
*
|
|
* @param c the cursor to be cached
|
|
* @param id the record id (_id) of the content
|
|
* @param projection the projection represented by the cursor
|
|
* @return whether or not the cursor was cached
|
|
*/
|
|
public Cursor putCursor(Cursor c, String id, String[] projection, CacheToken token) {
|
|
// Make sure the underlying cursor is at the first row, and do this without synchronizing,
|
|
// to prevent deadlock with a writing thread (which might, for example, be calling into
|
|
// CachedCursor.invalidate)
|
|
c.moveToPosition(0);
|
|
return putCursorImpl(c, id, projection, token);
|
|
}
|
|
public synchronized Cursor putCursorImpl(Cursor c, String id, String[] projection,
|
|
CacheToken token) {
|
|
try {
|
|
if (!token.isValid()) {
|
|
if (DebugUtils.DEBUG && DEBUG_CACHE) {
|
|
LogUtils.d(mLogTag, "============ Stale token for " + id);
|
|
}
|
|
mStats.mStaleCount++;
|
|
return c;
|
|
}
|
|
if (c != null && Arrays.equals(projection, mBaseProjection) && !sLockCache) {
|
|
if (DebugUtils.DEBUG && DEBUG_CACHE) {
|
|
LogUtils.d(mLogTag, "============ Caching cursor for: " + id);
|
|
}
|
|
// If we've already cached this cursor, invalidate the older one
|
|
Cursor existingCursor = get(id);
|
|
if (existingCursor != null) {
|
|
unlockImpl(id, null, false);
|
|
}
|
|
mLruCache.put(id, c);
|
|
return new CachedCursor(c, this, id);
|
|
}
|
|
return c;
|
|
} finally {
|
|
mTokenList.remove(token);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Find and, if found, return a cursor, based on cached values, for the supplied id
|
|
* @param id the _id column of the desired row
|
|
* @param projection the requested projection for a query
|
|
* @return a cursor based on cached values, or null if the row is not cached
|
|
*/
|
|
public synchronized Cursor getCachedCursor(String id, String[] projection) {
|
|
if (DebugUtils.DEBUG && DEBUG_STATISTICS) {
|
|
// Every 200 calls to getCursor, report cache statistics
|
|
dumpOnCount(200);
|
|
}
|
|
if (projection == mBaseProjection) {
|
|
return getCachedCursorImpl(id);
|
|
} else {
|
|
return getMatrixCursor(id, projection);
|
|
}
|
|
}
|
|
|
|
private CachedCursor getCachedCursorImpl(String id) {
|
|
Cursor c = get(id);
|
|
if (c != null) {
|
|
mStats.mHitCount++;
|
|
return new CachedCursor(c, this, id);
|
|
}
|
|
mStats.mMissCount++;
|
|
return null;
|
|
}
|
|
|
|
private MatrixCursor getMatrixCursor(String id, String[] projection) {
|
|
return getMatrixCursor(id, projection, null);
|
|
}
|
|
|
|
private MatrixCursor getMatrixCursor(String id, String[] projection,
|
|
ContentValues values) {
|
|
Cursor c = get(id);
|
|
if (c != null) {
|
|
// Make a new MatrixCursor with the requested columns
|
|
MatrixCursor mc = new MatrixCursorWithCachedColumns(projection, 1);
|
|
if (c.getCount() == 0) {
|
|
return mc;
|
|
}
|
|
Object[] row = new Object[projection.length];
|
|
if (values != null) {
|
|
// Make a copy; we don't want to change the original
|
|
values = new ContentValues(values);
|
|
}
|
|
int i = 0;
|
|
for (String column: projection) {
|
|
int columnIndex = c.getColumnIndex(column);
|
|
if (columnIndex < 0) {
|
|
mStats.mProjectionMissCount++;
|
|
return null;
|
|
} else {
|
|
String value;
|
|
if (values != null && values.containsKey(column)) {
|
|
Object val = values.get(column);
|
|
if (val instanceof Boolean) {
|
|
value = (val == Boolean.TRUE) ? "1" : "0";
|
|
} else {
|
|
value = values.getAsString(column);
|
|
}
|
|
values.remove(column);
|
|
} else {
|
|
value = c.getString(columnIndex);
|
|
}
|
|
row[i++] = value;
|
|
}
|
|
}
|
|
if (values != null && values.size() != 0) {
|
|
return null;
|
|
}
|
|
mc.addRow(row);
|
|
mStats.mHitCount++;
|
|
return mc;
|
|
}
|
|
mStats.mMissCount++;
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Lock a given row, such that no new valid CacheTokens can be created for the passed-in id.
|
|
* @param id the id of the row to lock
|
|
*/
|
|
public synchronized void lock(String id) {
|
|
// Prevent new valid tokens from being created
|
|
mLockMap.add(id);
|
|
// Invalidate current tokens
|
|
int count = mTokenList.invalidateTokens(id);
|
|
if (DebugUtils.DEBUG && DEBUG_TOKENS) {
|
|
LogUtils.d(mTokenList.mLogTag, "============ Lock invalidated " + count +
|
|
" tokens for: " + id);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Unlock a given row, allowing new valid CacheTokens to be created for the passed-in id.
|
|
* @param id the id of the item whose cursor is cached
|
|
*/
|
|
public synchronized void unlock(String id) {
|
|
unlockImpl(id, null, true);
|
|
}
|
|
|
|
/**
|
|
* If the row with id is currently cached, replaces the cached values with the supplied
|
|
* ContentValues. Then, unlock the row, so that new valid CacheTokens can be created.
|
|
*
|
|
* @param id the id of the item whose cursor is cached
|
|
* @param values updated values for this row
|
|
*/
|
|
public synchronized void unlock(String id, ContentValues values) {
|
|
unlockImpl(id, values, true);
|
|
}
|
|
|
|
/**
|
|
* If values are passed in, replaces any cached cursor with one containing new values, and
|
|
* then closes the previously cached one (if any, and if not in use)
|
|
* If values are not passed in, removes the row from cache
|
|
* If the row was locked, unlock it
|
|
* @param id the id of the row
|
|
* @param values new ContentValues for the row (or null if row should simply be removed)
|
|
* @param wasLocked whether or not the row was locked; if so, the lock will be removed
|
|
*/
|
|
private void unlockImpl(String id, ContentValues values, boolean wasLocked) {
|
|
Cursor c = get(id);
|
|
if (c != null) {
|
|
if (DebugUtils.DEBUG && DEBUG_CACHE) {
|
|
LogUtils.d(mLogTag, "=========== Unlocking cache for: " + id);
|
|
}
|
|
if (values != null && !sLockCache) {
|
|
MatrixCursor cursor = getMatrixCursor(id, mBaseProjection, values);
|
|
if (cursor != null) {
|
|
if (DebugUtils.DEBUG && DEBUG_CACHE) {
|
|
LogUtils.d(mLogTag, "=========== Recaching with new values: " + id);
|
|
}
|
|
cursor.moveToFirst();
|
|
mLruCache.put(id, cursor);
|
|
} else {
|
|
mLruCache.remove(id);
|
|
}
|
|
} else {
|
|
mLruCache.remove(id);
|
|
}
|
|
// If there are no cursors using the old cached cursor, close it
|
|
if (!sActiveCursors.contains(c)) {
|
|
c.close();
|
|
}
|
|
}
|
|
if (wasLocked) {
|
|
mLockMap.subtract(id);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Invalidate the entire cache, without logging
|
|
*/
|
|
public synchronized void invalidate() {
|
|
invalidate(null, null, null);
|
|
}
|
|
|
|
/**
|
|
* Invalidate the entire cache; the arguments are used for logging only, and indicate the
|
|
* write operation that caused the invalidation
|
|
*
|
|
* @param operation a string describing the operation causing the invalidate (or null)
|
|
* @param uri the uri causing the invalidate (or null)
|
|
* @param selection the selection used with the uri (or null)
|
|
*/
|
|
public synchronized void invalidate(String operation, Uri uri, String selection) {
|
|
if (DEBUG_CACHE && (operation != null)) {
|
|
LogUtils.d(mLogTag, "============ INVALIDATED BY " + operation + ": " + uri +
|
|
", SELECTION: " + selection);
|
|
}
|
|
mStats.mInvalidateCount++;
|
|
// Close all cached cursors that are no longer in use
|
|
mLruCache.evictAll();
|
|
// Invalidate all current tokens
|
|
mTokenList.invalidate();
|
|
}
|
|
|
|
// Debugging code below
|
|
|
|
private void dumpOnCount(int num) {
|
|
mStats.mOpCount++;
|
|
if ((mStats.mOpCount % num) == 0) {
|
|
dumpStats();
|
|
}
|
|
}
|
|
|
|
/*package*/ void recordQueryTime(Cursor c, long nanoTime) {
|
|
if (c instanceof CachedCursor) {
|
|
mStats.hitTimes += nanoTime;
|
|
mStats.hits++;
|
|
} else {
|
|
if (c.getCount() == 1) {
|
|
mStats.missTimes += nanoTime;
|
|
mStats.miss++;
|
|
}
|
|
}
|
|
}
|
|
|
|
public static synchronized void notCacheable(Uri uri, String selection) {
|
|
if (DEBUG_NOT_CACHEABLE) {
|
|
sNotCacheable++;
|
|
String str = uri.toString() + "$" + selection;
|
|
sNotCacheableMap.add(str);
|
|
}
|
|
}
|
|
|
|
// For use with unit tests
|
|
public static void invalidateAllCaches() {
|
|
for (ContentCache cache: sContentCaches) {
|
|
cache.invalidate();
|
|
}
|
|
}
|
|
|
|
/** Sets the cache lock. If the lock is {@code true}, also invalidates all cached items. */
|
|
public static void setLockCacheForTest(boolean lock) {
|
|
sLockCache = lock;
|
|
if (sLockCache) {
|
|
invalidateAllCaches();
|
|
}
|
|
}
|
|
|
|
static class Statistics {
|
|
private final ContentCache mCache;
|
|
private final String mName;
|
|
|
|
// Cache statistics
|
|
// The item is in the cache AND is used to create a cursor
|
|
private int mHitCount = 0;
|
|
// Basic cache miss (the item is not cached)
|
|
private int mMissCount = 0;
|
|
// Incremented when a cachePut is invalid due to an intervening write
|
|
private int mStaleCount = 0;
|
|
// A projection miss occurs when the item is cached, but not all requested columns are
|
|
// available in the base projection
|
|
private int mProjectionMissCount = 0;
|
|
// Incremented whenever the entire cache is invalidated
|
|
private int mInvalidateCount = 0;
|
|
// Count of operations put/get
|
|
private int mOpCount = 0;
|
|
// The following are for timing statistics
|
|
private long hits = 0;
|
|
private long hitTimes = 0;
|
|
private long miss = 0;
|
|
private long missTimes = 0;
|
|
|
|
// Used in toString() and addCacheStatistics()
|
|
private int mCursorCount = 0;
|
|
private int mTokenCount = 0;
|
|
|
|
Statistics(ContentCache cache) {
|
|
mCache = cache;
|
|
mName = mCache.mName;
|
|
}
|
|
|
|
Statistics(String name) {
|
|
mCache = null;
|
|
mName = name;
|
|
}
|
|
|
|
private void addCacheStatistics(ContentCache cache) {
|
|
if (cache != null) {
|
|
mHitCount += cache.mStats.mHitCount;
|
|
mMissCount += cache.mStats.mMissCount;
|
|
mProjectionMissCount += cache.mStats.mProjectionMissCount;
|
|
mStaleCount += cache.mStats.mStaleCount;
|
|
hitTimes += cache.mStats.hitTimes;
|
|
missTimes += cache.mStats.missTimes;
|
|
hits += cache.mStats.hits;
|
|
miss += cache.mStats.miss;
|
|
mCursorCount += cache.size();
|
|
mTokenCount += cache.mTokenList.size();
|
|
}
|
|
}
|
|
|
|
private static void append(StringBuilder sb, String name, Object value) {
|
|
sb.append(", ");
|
|
sb.append(name);
|
|
sb.append(": ");
|
|
sb.append(value);
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
if (mHitCount + mMissCount == 0) return "No cache";
|
|
int totalTries = mMissCount + mProjectionMissCount + mHitCount;
|
|
StringBuilder sb = new StringBuilder();
|
|
sb.append("Cache " + mName);
|
|
append(sb, "Cursors", mCache == null ? mCursorCount : mCache.size());
|
|
append(sb, "Hits", mHitCount);
|
|
append(sb, "Misses", mMissCount + mProjectionMissCount);
|
|
append(sb, "Inval", mInvalidateCount);
|
|
append(sb, "Tokens", mCache == null ? mTokenCount : mCache.mTokenList.size());
|
|
append(sb, "Hit%", mHitCount * 100 / totalTries);
|
|
append(sb, "\nHit time", hitTimes / 1000000.0 / hits);
|
|
append(sb, "Miss time", missTimes / 1000000.0 / miss);
|
|
return sb.toString();
|
|
}
|
|
}
|
|
|
|
public static void dumpStats() {
|
|
Statistics totals = new Statistics("Totals");
|
|
|
|
for (ContentCache cache: sContentCaches) {
|
|
if (cache != null) {
|
|
LogUtils.d(cache.mName, cache.mStats.toString());
|
|
totals.addCacheStatistics(cache);
|
|
}
|
|
}
|
|
LogUtils.d(totals.mName, totals.toString());
|
|
}
|
|
}
|