platform/vcs-impl/src/com/intellij/openapi/vcs/changes/RemoteRevisionsNumbersCache.java - platform/tools/idea - Git at Google

 /*
  * Copyright 2000-2014 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 com.intellij.openapi.vcs.changes;

 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.progress.ProcessCanceledException;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.Computable;
 import com.intellij.openapi.util.Getter;
 import com.intellij.openapi.util.Pair;
 import com.intellij.openapi.vcs.*;
 import com.intellij.openapi.vcs.diff.DiffProvider;
 import com.intellij.openapi.vcs.diff.ItemLatestState;
 import com.intellij.openapi.vcs.history.VcsRevisionNumber;
 import com.intellij.openapi.vfs.LocalFileSystem;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.util.Consumer;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;

 import java.io.File;
 import java.util.*;

 /**
  * for vcses where it is reasonable to ask revision of each item separately
  */
 public class RemoteRevisionsNumbersCache implements ChangesOnServerTracker {
   public static final Logger LOG = Logger.getInstance("#com.intellij.openapi.vcs.changes.RemoteRevisionsNumbersCache");

   // every hour (time unit to check for server commits)
   // default, actual in settings
   private static final long ourRottenPeriod = 3600 * 1000;
   private final Map<String, Pair<VcsRoot, VcsRevisionNumber>> myData;
   private final Map<VcsRoot, LazyRefreshingSelfQueue<String>> myRefreshingQueues;
   private final Map<String, VcsRevisionNumber> myLatestRevisionsMap;
   private final ProjectLevelVcsManager myVcsManager;
   private final LocalFileSystem myLfs;
   private boolean mySomethingChanged;

   private final Object myLock;

   public static final VcsRevisionNumber NOT_LOADED = new VcsRevisionNumber() {
     public String asString() {
       return "NOT_LOADED";
     }

     public int compareTo(@NotNull VcsRevisionNumber o) {
       return o == this ? 0 : -1;
     }
   };
   public static final VcsRevisionNumber UNKNOWN = new VcsRevisionNumber() {
     public String asString() {
       return "UNKNOWN";
     }

     public int compareTo(@NotNull VcsRevisionNumber o) {
       return o == this ? 0 : -1;
     }
   };
   private final VcsConfiguration myVcsConfiguration;
   private final Project myProject;

   RemoteRevisionsNumbersCache(final Project project) {
     myProject = project;
     myLock = new Object();
     myData = new HashMap<String, Pair<VcsRoot, VcsRevisionNumber>>();
     myRefreshingQueues = Collections.synchronizedMap(new HashMap<VcsRoot, LazyRefreshingSelfQueue<String>>());
     myLatestRevisionsMap = new HashMap<String, VcsRevisionNumber>();
     myLfs = LocalFileSystem.getInstance();
     myVcsManager = ProjectLevelVcsManager.getInstance(project);
     myVcsConfiguration = VcsConfiguration.getInstance(project);
   }

   public boolean updateStep() {
     mySomethingChanged = false;
     // copy under lock
     final HashMap<VcsRoot, LazyRefreshingSelfQueue> copyMap;
     synchronized (myLock) {
       copyMap = new HashMap<VcsRoot, LazyRefreshingSelfQueue>(myRefreshingQueues);
     }

     // filter only items for vcs roots that support background operations
     for (Iterator<Map.Entry<VcsRoot, LazyRefreshingSelfQueue>> iterator = copyMap.entrySet().iterator(); iterator.hasNext();) {
       final Map.Entry<VcsRoot, LazyRefreshingSelfQueue> entry = iterator.next();
       final VcsRoot key = entry.getKey();
       final boolean backgroundOperationsAllowed = key.getVcs().isVcsBackgroundOperationsAllowed(key.getPath());
       LOG.debug("backgroundOperationsAllowed: " + backgroundOperationsAllowed + " for " + key.getVcs().getName() + ", " + key.getPath().getPath());
       if (! backgroundOperationsAllowed) {
         iterator.remove();
       }
     }
     LOG.debug("queues refresh started, queues: " + copyMap.size());
     // refresh "up to date" info
     for (LazyRefreshingSelfQueue queue : copyMap.values()) {
       if (myProject.isDisposed()) throw new ProcessCanceledException();
       queue.updateStep();
     }
     return mySomethingChanged;
   }

   public void directoryMappingChanged() {
     // copy myData under lock
     HashSet<String> keys;
     synchronized (myLock) {
       keys = new HashSet<String>(myData.keySet());
     }
     // collect new vcs for scheduled files
     final Map<String, Pair<VirtualFile, AbstractVcs>> vFiles = new HashMap<String, Pair<VirtualFile, AbstractVcs>>();
     for (String key : keys) {
       final VirtualFile vf = myLfs.refreshAndFindFileByIoFile(new File(key));
       final AbstractVcs newVcs = (vf == null) ? null : myVcsManager.getVcsFor(vf);
       vFiles.put(key, vf == null ? Pair.create((VirtualFile) null, (AbstractVcs)null) : Pair.create(vf, newVcs));
     }
     synchronized (myLock) {
       keys = new HashSet<String>(myData.keySet());
       for (String key : keys) {
         final Pair<VcsRoot, VcsRevisionNumber> value = myData.get(key);
         final VcsRoot storedVcsRoot = value.getFirst();
         final Pair<VirtualFile, AbstractVcs> pair = vFiles.get(key);
         if (pair == null) {
           continue; // already added with new mappings
         }
         final VirtualFile vf = pair.getFirst();
         final AbstractVcs newVcs = pair.getSecond();

         if (newVcs == null) {
           myData.remove(key);
           getQueue(storedVcsRoot).forceRemove(key);
         } else {
           final VirtualFile newRoot = myVcsManager.getVcsRootFor(vf);
           final VcsRoot newVcsRoot = new VcsRoot(newVcs, newRoot);
           if (! storedVcsRoot.equals(newVcsRoot)) {
             switchVcs(storedVcsRoot, newVcsRoot, key);
           }
         }
       }
     }
   }

   private void switchVcs(final VcsRoot oldVcsRoot, final VcsRoot newVcsRoot, final String key) {
     synchronized (myLock) {
       final LazyRefreshingSelfQueue<String> oldQueue = getQueue(oldVcsRoot);
       final LazyRefreshingSelfQueue<String> newQueue = getQueue(newVcsRoot);
       myData.put(key, Pair.create(newVcsRoot, NOT_LOADED));
       oldQueue.forceRemove(key);
       newQueue.addRequest(key);
     }
   }

   public void plus(final Pair<String, AbstractVcs> pair) {
     // does not support
     if (pair.getSecond().getDiffProvider() == null) return;

     final String key = pair.getFirst();
     final AbstractVcs newVcs = pair.getSecond();

     final VirtualFile root = getRootForPath(key);
     if (root == null) return;

     final VcsRoot vcsRoot = new VcsRoot(newVcs, root);

     synchronized (myLock) {
       final Pair<VcsRoot, VcsRevisionNumber> value = myData.get(key);
       if (value == null) {
         final LazyRefreshingSelfQueue<String> queue = getQueue(vcsRoot);
         myData.put(key, Pair.create(vcsRoot, NOT_LOADED));
         queue.addRequest(key);
       } else if (! value.getFirst().equals(vcsRoot)) {
         switchVcs(value.getFirst(), vcsRoot, key);
       }
     }
   }

   public void invalidate(final Collection<String> paths) {
     synchronized (myLock) {
       for (String path : paths) {
         final Pair<VcsRoot, VcsRevisionNumber> pair = myData.remove(path);
         if (pair != null) {
           // vcs [root] seems to not change
           final VcsRoot vcsRoot = pair.getFirst();
           final LazyRefreshingSelfQueue<String> queue = getQueue(vcsRoot);
           queue.forceRemove(path);
           queue.addRequest(path);
           myData.put(path, Pair.create(vcsRoot, NOT_LOADED));
         }
       }
     }
   }

   @Nullable
   private VirtualFile getRootForPath(final String s) {
     return myVcsManager.getVcsRootFor(new FilePathImpl(new File(s), false));
   }

   public void minus(Pair<String, AbstractVcs> pair) {
     // does not support
     if (pair.getSecond().getDiffProvider() == null) return;
     final VirtualFile root = getRootForPath(pair.getFirst());
     if (root == null) return;

     final LazyRefreshingSelfQueue<String> queue;
     final String key = pair.getFirst();
     synchronized (myLock) {
       queue = getQueue(new VcsRoot(pair.getSecond(), root));
       myData.remove(key);
     }
     queue.forceRemove(key);
   }

   // +-
   @NotNull
   private LazyRefreshingSelfQueue<String> getQueue(final VcsRoot vcsRoot) {
     synchronized (myLock) {
       LazyRefreshingSelfQueue<String> queue = myRefreshingQueues.get(vcsRoot);
       if (queue != null) return queue;

       queue = new LazyRefreshingSelfQueue<String>(new Getter<Long>() {
         public Long get() {
           return myVcsConfiguration.CHANGED_ON_SERVER_INTERVAL > 0 ? myVcsConfiguration.CHANGED_ON_SERVER_INTERVAL * 60000 : ourRottenPeriod;
         }
       }, new MyShouldUpdateChecker(vcsRoot), new MyUpdater(vcsRoot));
       myRefreshingQueues.put(vcsRoot, queue);
       return queue;
     }
   }

   private class MyUpdater implements Consumer<String> {
     private final VcsRoot myVcsRoot;

     public MyUpdater(final VcsRoot vcsRoot) {
       myVcsRoot = vcsRoot;
     }

     public void consume(String s) {
       LOG.debug("update for: " + s);
       //todo check canceled - check VCS's ready for asynchronous queries
       // get last remote revision for file
       final VirtualFile vf = myLfs.refreshAndFindFileByIoFile(new File(s));
       final ItemLatestState state;
       final DiffProvider diffProvider = myVcsRoot.getVcs().getDiffProvider();
       if (vf == null) {
         // doesnt matter if directory or not
         state = diffProvider.getLastRevision(FilePathImpl.createForDeletedFile(new File(s), false));
       } else {
         state = diffProvider.getLastRevision(vf);
       }
       final VcsRevisionNumber newNumber = (state == null) || state.isDefaultHead() ? UNKNOWN : state.getNumber();

       final Pair<VcsRoot, VcsRevisionNumber> oldPair;
       // update value in cache
       synchronized (myLock) {
         oldPair = myData.get(s);
         myData.put(s, Pair.create(myVcsRoot, newNumber));
       }

       if (oldPair == null || oldPair.getSecond().compareTo(newNumber) != 0) {
         LOG.debug("refresh triggered by " + s);
         mySomethingChanged = true;
       }
     }
   }

   private class MyShouldUpdateChecker implements Computable<Boolean> {
     private final VcsRoot myVcsRoot;

     public MyShouldUpdateChecker(final VcsRoot vcsRoot) {
       myVcsRoot = vcsRoot;
     }

     // Check if currently cached vcs root latest revision is less than latest vcs root revision
     // => update should be performed in this case
     public Boolean compute() {
       final AbstractVcs vcs = myVcsRoot.getVcs();
       // won't be called in parallel for same vcs -> just synchronized map is ok
       final String vcsName = vcs.getName();
       LOG.debug("should update for: " + vcsName + " root: " + myVcsRoot.getPath().getPath());
       final VcsRevisionNumber latestNew = vcs.getDiffProvider().getLatestCommittedRevision(myVcsRoot.getPath());

       // TODO: Why vcsName is used as key and not myVcsRoot.getKey()???
       // TODO: This seems to be invalid logic as we get latest revision for vcs root
       final VcsRevisionNumber latestKnown = myLatestRevisionsMap.get(vcsName);
       // not known
       if (latestNew == null) return true;
       if ((latestKnown == null) || (latestNew.compareTo(latestKnown) != 0)) {
         myLatestRevisionsMap.put(vcsName, latestNew);
         return true;
       }
       return false;
     }
   }

   private VcsRevisionNumber getNumber(final String path) {
     synchronized (myLock) {
       final Pair<VcsRoot, VcsRevisionNumber> pair = myData.get(path);
       return pair == null ? NOT_LOADED : pair.getSecond();
     }
   }

   public boolean isUpToDate(final Change change) {
     if (change.getBeforeRevision() != null && change.getAfterRevision() != null && (! change.isMoved()) && (! change.isRenamed())) {
       return getRevisionState(change.getBeforeRevision());
     }
     return getRevisionState(change.getBeforeRevision()) && getRevisionState(change.getAfterRevision());
   }

   /**
    * Returns {@code true} if passed revision is up to date, comparing to latest repository revision.
    */
   private boolean getRevisionState(final ContentRevision revision) {
     if (revision != null) {
       // TODO: Seems peg revision should also be tracked here.
       final VcsRevisionNumber local = revision.getRevisionNumber();
       final String path = revision.getFile().getIOFile().getAbsolutePath();
       final VcsRevisionNumber remote = getNumber(path);

       return NOT_LOADED == remote || UNKNOWN == remote || local.compareTo(remote) >= 0;
     }
     return true;
   }
 }
	/*
	* Copyright 2000-2014 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 com.intellij.openapi.vcs.changes;

	import com.intellij.openapi.diagnostic.Logger;
	import com.intellij.openapi.progress.ProcessCanceledException;
	import com.intellij.openapi.project.Project;
	import com.intellij.openapi.util.Computable;
	import com.intellij.openapi.util.Getter;
	import com.intellij.openapi.util.Pair;
	import com.intellij.openapi.vcs.*;
	import com.intellij.openapi.vcs.diff.DiffProvider;
	import com.intellij.openapi.vcs.diff.ItemLatestState;
	import com.intellij.openapi.vcs.history.VcsRevisionNumber;
	import com.intellij.openapi.vfs.LocalFileSystem;
	import com.intellij.openapi.vfs.VirtualFile;
	import com.intellij.util.Consumer;
	import org.jetbrains.annotations.NotNull;
	import org.jetbrains.annotations.Nullable;

	import java.io.File;
	import java.util.*;

	/**
	* for vcses where it is reasonable to ask revision of each item separately
	*/
	public class RemoteRevisionsNumbersCache implements ChangesOnServerTracker {
	public static final Logger LOG = Logger.getInstance("#com.intellij.openapi.vcs.changes.RemoteRevisionsNumbersCache");

	// every hour (time unit to check for server commits)
	// default, actual in settings
	private static final long ourRottenPeriod = 3600 * 1000;
	private final Map<String, Pair<VcsRoot, VcsRevisionNumber>> myData;
	private final Map<VcsRoot, LazyRefreshingSelfQueue<String>> myRefreshingQueues;
	private final Map<String, VcsRevisionNumber> myLatestRevisionsMap;
	private final ProjectLevelVcsManager myVcsManager;
	private final LocalFileSystem myLfs;
	private boolean mySomethingChanged;

	private final Object myLock;

	public static final VcsRevisionNumber NOT_LOADED = new VcsRevisionNumber() {
	public String asString() {
	return "NOT_LOADED";
	}

	public int compareTo(@NotNull VcsRevisionNumber o) {
	return o == this ? 0 : -1;
	}
	};
	public static final VcsRevisionNumber UNKNOWN = new VcsRevisionNumber() {
	public String asString() {
	return "UNKNOWN";
	}

	public int compareTo(@NotNull VcsRevisionNumber o) {
	return o == this ? 0 : -1;
	}
	};
	private final VcsConfiguration myVcsConfiguration;
	private final Project myProject;

	RemoteRevisionsNumbersCache(final Project project) {
	myProject = project;
	myLock = new Object();
	myData = new HashMap<String, Pair<VcsRoot, VcsRevisionNumber>>();
	myRefreshingQueues = Collections.synchronizedMap(new HashMap<VcsRoot, LazyRefreshingSelfQueue<String>>());
	myLatestRevisionsMap = new HashMap<String, VcsRevisionNumber>();
	myLfs = LocalFileSystem.getInstance();
	myVcsManager = ProjectLevelVcsManager.getInstance(project);
	myVcsConfiguration = VcsConfiguration.getInstance(project);
	}

	public boolean updateStep() {
	mySomethingChanged = false;
	// copy under lock
	final HashMap<VcsRoot, LazyRefreshingSelfQueue> copyMap;
	synchronized (myLock) {
	copyMap = new HashMap<VcsRoot, LazyRefreshingSelfQueue>(myRefreshingQueues);
	}

	// filter only items for vcs roots that support background operations
	for (Iterator<Map.Entry<VcsRoot, LazyRefreshingSelfQueue>> iterator = copyMap.entrySet().iterator(); iterator.hasNext();) {
	final Map.Entry<VcsRoot, LazyRefreshingSelfQueue> entry = iterator.next();
	final VcsRoot key = entry.getKey();
	final boolean backgroundOperationsAllowed = key.getVcs().isVcsBackgroundOperationsAllowed(key.getPath());
	LOG.debug("backgroundOperationsAllowed: " + backgroundOperationsAllowed + " for " + key.getVcs().getName() + ", " + key.getPath().getPath());
	if (! backgroundOperationsAllowed) {
	iterator.remove();
	}
	}
	LOG.debug("queues refresh started, queues: " + copyMap.size());
	// refresh "up to date" info
	for (LazyRefreshingSelfQueue queue : copyMap.values()) {
	if (myProject.isDisposed()) throw new ProcessCanceledException();
	queue.updateStep();
	}
	return mySomethingChanged;
	}

	public void directoryMappingChanged() {
	// copy myData under lock
	HashSet<String> keys;
	synchronized (myLock) {
	keys = new HashSet<String>(myData.keySet());
	}
	// collect new vcs for scheduled files
	final Map<String, Pair<VirtualFile, AbstractVcs>> vFiles = new HashMap<String, Pair<VirtualFile, AbstractVcs>>();
	for (String key : keys) {
	final VirtualFile vf = myLfs.refreshAndFindFileByIoFile(new File(key));
	final AbstractVcs newVcs = (vf == null) ? null : myVcsManager.getVcsFor(vf);
	vFiles.put(key, vf == null ? Pair.create((VirtualFile) null, (AbstractVcs)null) : Pair.create(vf, newVcs));
	}
	synchronized (myLock) {
	keys = new HashSet<String>(myData.keySet());
	for (String key : keys) {
	final Pair<VcsRoot, VcsRevisionNumber> value = myData.get(key);
	final VcsRoot storedVcsRoot = value.getFirst();
	final Pair<VirtualFile, AbstractVcs> pair = vFiles.get(key);
	if (pair == null) {
	continue; // already added with new mappings
	}
	final VirtualFile vf = pair.getFirst();
	final AbstractVcs newVcs = pair.getSecond();

	if (newVcs == null) {
	myData.remove(key);
	getQueue(storedVcsRoot).forceRemove(key);
	} else {
	final VirtualFile newRoot = myVcsManager.getVcsRootFor(vf);
	final VcsRoot newVcsRoot = new VcsRoot(newVcs, newRoot);
	if (! storedVcsRoot.equals(newVcsRoot)) {
	switchVcs(storedVcsRoot, newVcsRoot, key);
	}
	}
	}
	}
	}

	private void switchVcs(final VcsRoot oldVcsRoot, final VcsRoot newVcsRoot, final String key) {
	synchronized (myLock) {
	final LazyRefreshingSelfQueue<String> oldQueue = getQueue(oldVcsRoot);
	final LazyRefreshingSelfQueue<String> newQueue = getQueue(newVcsRoot);
	myData.put(key, Pair.create(newVcsRoot, NOT_LOADED));
	oldQueue.forceRemove(key);
	newQueue.addRequest(key);
	}
	}

	public void plus(final Pair<String, AbstractVcs> pair) {
	// does not support
	if (pair.getSecond().getDiffProvider() == null) return;

	final String key = pair.getFirst();
	final AbstractVcs newVcs = pair.getSecond();

	final VirtualFile root = getRootForPath(key);
	if (root == null) return;

	final VcsRoot vcsRoot = new VcsRoot(newVcs, root);

	synchronized (myLock) {
	final Pair<VcsRoot, VcsRevisionNumber> value = myData.get(key);
	if (value == null) {
	final LazyRefreshingSelfQueue<String> queue = getQueue(vcsRoot);
	myData.put(key, Pair.create(vcsRoot, NOT_LOADED));
	queue.addRequest(key);
	} else if (! value.getFirst().equals(vcsRoot)) {
	switchVcs(value.getFirst(), vcsRoot, key);
	}
	}
	}

	public void invalidate(final Collection<String> paths) {
	synchronized (myLock) {
	for (String path : paths) {
	final Pair<VcsRoot, VcsRevisionNumber> pair = myData.remove(path);
	if (pair != null) {
	// vcs [root] seems to not change
	final VcsRoot vcsRoot = pair.getFirst();
	final LazyRefreshingSelfQueue<String> queue = getQueue(vcsRoot);
	queue.forceRemove(path);
	queue.addRequest(path);
	myData.put(path, Pair.create(vcsRoot, NOT_LOADED));
	}
	}
	}
	}

	@Nullable
	private VirtualFile getRootForPath(final String s) {
	return myVcsManager.getVcsRootFor(new FilePathImpl(new File(s), false));
	}

	public void minus(Pair<String, AbstractVcs> pair) {
	// does not support
	if (pair.getSecond().getDiffProvider() == null) return;
	final VirtualFile root = getRootForPath(pair.getFirst());
	if (root == null) return;

	final LazyRefreshingSelfQueue<String> queue;
	final String key = pair.getFirst();
	synchronized (myLock) {
	queue = getQueue(new VcsRoot(pair.getSecond(), root));
	myData.remove(key);
	}
	queue.forceRemove(key);
	}

	// +-
	@NotNull
	private LazyRefreshingSelfQueue<String> getQueue(final VcsRoot vcsRoot) {
	synchronized (myLock) {
	LazyRefreshingSelfQueue<String> queue = myRefreshingQueues.get(vcsRoot);
	if (queue != null) return queue;

	queue = new LazyRefreshingSelfQueue<String>(new Getter<Long>() {
	public Long get() {
	return myVcsConfiguration.CHANGED_ON_SERVER_INTERVAL > 0 ? myVcsConfiguration.CHANGED_ON_SERVER_INTERVAL * 60000 : ourRottenPeriod;
	}
	}, new MyShouldUpdateChecker(vcsRoot), new MyUpdater(vcsRoot));
	myRefreshingQueues.put(vcsRoot, queue);
	return queue;
	}
	}

	private class MyUpdater implements Consumer<String> {
	private final VcsRoot myVcsRoot;

	public MyUpdater(final VcsRoot vcsRoot) {
	myVcsRoot = vcsRoot;
	}

	public void consume(String s) {
	LOG.debug("update for: " + s);
	//todo check canceled - check VCS's ready for asynchronous queries
	// get last remote revision for file
	final VirtualFile vf = myLfs.refreshAndFindFileByIoFile(new File(s));
	final ItemLatestState state;
	final DiffProvider diffProvider = myVcsRoot.getVcs().getDiffProvider();
	if (vf == null) {
	// doesnt matter if directory or not
	state = diffProvider.getLastRevision(FilePathImpl.createForDeletedFile(new File(s), false));
	} else {
	state = diffProvider.getLastRevision(vf);
	}
	final VcsRevisionNumber newNumber = (state == null) \|\| state.isDefaultHead() ? UNKNOWN : state.getNumber();

	final Pair<VcsRoot, VcsRevisionNumber> oldPair;
	// update value in cache
	synchronized (myLock) {
	oldPair = myData.get(s);
	myData.put(s, Pair.create(myVcsRoot, newNumber));
	}

	if (oldPair == null \|\| oldPair.getSecond().compareTo(newNumber) != 0) {
	LOG.debug("refresh triggered by " + s);
	mySomethingChanged = true;
	}
	}
	}

	private class MyShouldUpdateChecker implements Computable<Boolean> {
	private final VcsRoot myVcsRoot;

	public MyShouldUpdateChecker(final VcsRoot vcsRoot) {
	myVcsRoot = vcsRoot;
	}

	// Check if currently cached vcs root latest revision is less than latest vcs root revision
	// => update should be performed in this case
	public Boolean compute() {
	final AbstractVcs vcs = myVcsRoot.getVcs();
	// won't be called in parallel for same vcs -> just synchronized map is ok
	final String vcsName = vcs.getName();
	LOG.debug("should update for: " + vcsName + " root: " + myVcsRoot.getPath().getPath());
	final VcsRevisionNumber latestNew = vcs.getDiffProvider().getLatestCommittedRevision(myVcsRoot.getPath());

	// TODO: Why vcsName is used as key and not myVcsRoot.getKey()???
	// TODO: This seems to be invalid logic as we get latest revision for vcs root
	final VcsRevisionNumber latestKnown = myLatestRevisionsMap.get(vcsName);
	// not known
	if (latestNew == null) return true;
	if ((latestKnown == null) \|\| (latestNew.compareTo(latestKnown) != 0)) {
	myLatestRevisionsMap.put(vcsName, latestNew);
	return true;
	}
	return false;
	}
	}

	private VcsRevisionNumber getNumber(final String path) {
	synchronized (myLock) {
	final Pair<VcsRoot, VcsRevisionNumber> pair = myData.get(path);
	return pair == null ? NOT_LOADED : pair.getSecond();
	}
	}

	public boolean isUpToDate(final Change change) {
	if (change.getBeforeRevision() != null && change.getAfterRevision() != null && (! change.isMoved()) && (! change.isRenamed())) {
	return getRevisionState(change.getBeforeRevision());
	}
	return getRevisionState(change.getBeforeRevision()) && getRevisionState(change.getAfterRevision());
	}

	/**
	* Returns {@code true} if passed revision is up to date, comparing to latest repository revision.
	*/
	private boolean getRevisionState(final ContentRevision revision) {
	if (revision != null) {
	// TODO: Seems peg revision should also be tracked here.
	final VcsRevisionNumber local = revision.getRevisionNumber();
	final String path = revision.getFile().getIOFile().getAbsolutePath();
	final VcsRevisionNumber remote = getNumber(path);

	return NOT_LOADED == remote \|\| UNKNOWN == remote \|\| local.compareTo(remote) >= 0;
	}
	return true;
	}
	}