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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* 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 org.jetbrains.idea.svn.history;
import com.intellij.lifecycle.PeriodicalTasksCloser;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Disposer;
import com.intellij.openapi.vcs.RepositoryLocation;
import com.intellij.openapi.vcs.VcsException;
import com.intellij.openapi.vcs.changes.committed.ChangesBunch;
import com.intellij.openapi.vcs.changes.committed.CommittedChangesCache;
import com.intellij.openapi.vcs.changes.committed.CommittedChangesListener;
import com.intellij.openapi.vcs.versionBrowser.CommittedChangeList;
import com.intellij.util.containers.SoftHashMap;
import com.intellij.util.messages.MessageBusConnection;
import org.jetbrains.annotations.Nullable;
import java.util.*;
public class LoadedRevisionsCache implements Disposable {
private static final Logger LOG = Logger.getInstance("#org.jetbrains.idea.svn.history.LoadedRevisionsCache");
private final Project myProject;
private final Map<String, Bunch> myMap;
private final Object refreshLock = new Object();
private long myRefreshTime;
private final MessageBusConnection myConnection;
public static LoadedRevisionsCache getInstance(final Project project) {
return PeriodicalTasksCloser.getInstance().safeGetService(project, LoadedRevisionsCache.class);
}
private LoadedRevisionsCache(final Project project) {
myProject = project;
myMap = (ApplicationManager.getApplication().isUnitTestMode()) ? new HashMap<String, Bunch>() : new SoftHashMap<String, Bunch>();
myConnection = project.getMessageBus().connect();
myConnection.subscribe(CommittedChangesCache.COMMITTED_TOPIC, new CommittedChangesListener() {
public void changesLoaded(final RepositoryLocation location, final List<CommittedChangeList> changes) {
ApplicationManager.getApplication().invokeLater(new Runnable() {
public void run() {
myMap.clear();
setRefreshTime(System.currentTimeMillis());
}
});
}
@Override
public void changesCleared() {
}
@Override
public void presentationChanged() {
}
public void incomingChangesUpdated(@Nullable final List<CommittedChangeList> receivedChanges) {
}
public void refreshErrorStatusChanged(@Nullable final VcsException lastError) {
}
});
Disposer.register(myProject, this);
setRefreshTime(0);
}
private long getRefreshTime() {
synchronized (refreshLock) {
return myRefreshTime;
}
}
private void setRefreshTime(final long refreshTime) {
synchronized (refreshLock) {
myRefreshTime = refreshTime;
}
}
private void debugInfo(final List<CommittedChangeList> data, final boolean consistentWithPrevious, final Bunch bindTo) {
LOG.debug(">>> cache internal >>> consistent: " + consistentWithPrevious + " bindTo: " + bindTo +
" oldest list: " + data.get(data.size() - 1).getNumber() + ", youngest list: " + data.get(0).getNumber());
}
public void dispose() {
myConnection.disconnect();
myMap.clear();
}
private List<List<CommittedChangeList>> split(final List<CommittedChangeList> list, final int size) {
final int listSize = list.size();
if (listSize < size) {
return Collections.singletonList(list);
}
final int first = listSize % size;
int start = 0;
int end = (first == 0) ? (Math.min(listSize, size)) : first;
final List<List<CommittedChangeList>> result = new ArrayList<List<CommittedChangeList>>(listSize / size + 1);
while (start < listSize) {
result.add(list.subList(start, end));
start = end;
end += size;
}
return result;
}
@Nullable
public Bunch put(final List<CommittedChangeList> data, final boolean consistentWithPrevious, final Bunch bindTo) {
if (data.isEmpty()) {
return null;
}
final SvnRepositoryLocation repositoryLocation = ((SvnChangeList) data.get(0)).getLocation();
final String location = repositoryLocation.getURL();
final List<List<CommittedChangeList>> list = split(data, SvnRevisionsNavigationMediator.CHUNK_SIZE);
Bunch bindToBunch = bindTo;
if (bindToBunch == null) {
final Bunch fromCache = myMap.get(location);
if (fromCache != null) {
final long passedSmallestNumber = data.get(data.size() - 1).getNumber();
final List<CommittedChangeList> cachedList = fromCache.getList();
final long greatestNumber = cachedList.get(0).getNumber();
if (greatestNumber < passedSmallestNumber) {
bindToBunch = fromCache;
}
}
}
boolean consistent = consistentWithPrevious;
for (int i = list.size() - 1; i >= 0; -- i) {
final List<CommittedChangeList> changeLists = list.get(i);
debugInfo(changeLists, consistent, bindToBunch);
bindToBunch = new Bunch(changeLists, consistent, bindToBunch);
consistent = true;
}
myMap.put(location, bindToBunch);
return bindToBunch;
}
@Nullable
public Iterator<ChangesBunch> iterator(final String location) {
final Bunch bunch = myMap.get(location);
if (bunch == null) {
return null;
}
return new BunchIterator(bunch);
}
private class BunchIterator implements Iterator<ChangesBunch> {
private final long myCreationTime;
private Bunch myBunch;
private BunchIterator(final Bunch bunch) {
myBunch = bunch;
myCreationTime = System.currentTimeMillis();
}
private void checkValidity() {
ApplicationManager.getApplication().assertIsDispatchThread();
if (myCreationTime <= getRefreshTime()) {
throw new SwitchRevisionsProviderException();
}
}
public boolean hasNext() {
checkValidity();
return myBunch != null;
}
public ChangesBunch next() {
checkValidity();
final Bunch current = myBunch;
myBunch = myBunch.myNext;
return current;
}
public void remove() {
throw new UnsupportedOperationException();
}
}
public static class Bunch extends ChangesBunch {
private final Bunch myNext;
private Bunch(final List<CommittedChangeList> list, final boolean consistent, final Bunch next) {
super(list, consistent);
myNext = next;
}
public Bunch getNext() {
return myNext;
}
}
}
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