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// Copyright 2008 Google Inc.
//
// 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.google.gerrit.client.data;
import com.google.gerrit.client.reviewdb.Account;
import com.google.gerrit.client.reviewdb.ReviewDb;
import com.google.gerrit.client.rpc.Common;
import com.google.gwtorm.client.OrmException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/** Cache of account information. */
public class AccountCache {
private final LinkedHashMap<Account.Id, Account> byId =
new LinkedHashMap<Account.Id, Account>(16, 0.75f, true) {
@Override
protected boolean removeEldestEntry(
final Map.Entry<Account.Id, Account> eldest) {
return 4096 <= size();
}
};
/**
* Invalidate all cached information about a single user account.
*
* @param accountId the account to invalidate from the cache.
*/
public void invalidate(final Account.Id accountId) {
synchronized (byId) {
byId.remove(accountId);
}
}
/**
* Get a single account.
*
* @param accountId the account to obtain.
* @return the cached account entity; null if the account is not in the
* database anymore.
*/
public Account get(final Account.Id accountId) {
return get(accountId, null);
}
/**
* Get a single account.
*
* @param accountId the account to obtain.
* @param qd optional connection to reuse (if not null) when doing a lookup.
* @return the cached account entity; null if the account is not in the
* database anymore.
*/
public Account get(final Account.Id accountId, final ReviewDb qd) {
if (accountId == null) {
return null;
}
Account m;
synchronized (byId) {
m = byId.get(accountId);
}
if (m != null) {
return m;
}
try {
final ReviewDb db = qd != null ? qd : Common.getSchemaFactory().open();
try {
m = db.accounts().get(accountId);
} finally {
if (qd == null) {
db.close();
}
}
} catch (OrmException e) {
m = null;
}
if (m != null) {
synchronized (byId) {
byId.put(m.getId(), m);
}
}
return m;
}
/**
* Lookup multiple account records.
*
* @param fetch set of all accounts to obtain.
* @param qd optional query handle to use if the account data is not in cache.
* @return records which match; if an account listed in <code>fetch</code> is
* not found it will not be returned.
*/
public Collection<Account> get(final Set<Account.Id> fetch, final ReviewDb qd) {
final Set<Account.Id> toget = new HashSet<Account.Id>(fetch);
final Collection<Account> r = new ArrayList<Account>(toget.size());
synchronized (byId) {
for (final Iterator<Account.Id> i = toget.iterator(); i.hasNext();) {
final Account m = byId.get(i.next());
if (m != null) {
r.add(m);
i.remove();
}
}
}
if (!toget.isEmpty()) {
List<Account> found;
try {
final ReviewDb db = qd != null ? qd : Common.getSchemaFactory().open();
try {
found = qd.accounts().get(toget).toList();
} finally {
if (qd == null) {
db.close();
}
}
} catch (OrmException e) {
found = Collections.emptyList();
}
if (!found.isEmpty()) {
synchronized (byId) {
for (final Account a : found) {
byId.put(a.getId(), a);
}
}
r.addAll(found);
}
}
return r;
}
/** Force the entire cache to flush from memory and recompute. */
public void flush() {
synchronized (byId) {
byId.clear();
}
}
}
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