| /* |
| * 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 com.intellij.history.core; |
| |
| import com.intellij.history.core.changes.Change; |
| import com.intellij.history.core.changes.ChangeSet; |
| import com.intellij.history.core.changes.ChangeVisitor; |
| import com.intellij.history.utils.LocalHistoryLog; |
| import com.intellij.openapi.application.ApplicationManager; |
| import com.intellij.openapi.util.Clock; |
| import com.intellij.util.Consumer; |
| import gnu.trove.TIntHashSet; |
| import org.jetbrains.annotations.TestOnly; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| public class ChangeList { |
| private final ChangeListStorage myStorage; |
| |
| private int myChangeSetDepth; |
| private ChangeSet myCurrentChangeSet; |
| |
| private int myIntervalBetweenActivities = 12 * 60 * 60 * 1000; // 12 hours |
| |
| public ChangeList(ChangeListStorage storage) { |
| myStorage = storage; |
| } |
| |
| public synchronized void close() { |
| if (!ApplicationManager.getApplication().isUnitTestMode()) { |
| LocalHistoryLog.LOG.assertTrue(myCurrentChangeSet == null || myCurrentChangeSet.isEmpty(), |
| "current changes won't be saved: " + myCurrentChangeSet); |
| } |
| myStorage.close(); |
| } |
| |
| public synchronized long nextId() { |
| return myStorage.nextId(); |
| } |
| |
| public synchronized void addChange(Change c) { |
| assert myChangeSetDepth != 0; |
| myCurrentChangeSet.addChange(c); |
| } |
| |
| public synchronized void beginChangeSet() { |
| myChangeSetDepth++; |
| if (myChangeSetDepth > 1) return; |
| |
| doBeginChangeSet(); |
| } |
| |
| private void doBeginChangeSet() { |
| myCurrentChangeSet = new ChangeSet(nextId(), Clock.getTime()); |
| } |
| |
| public synchronized boolean forceBeginChangeSet() { |
| boolean split = myChangeSetDepth > 0; |
| if (split) doEndChangeSet(null); |
| |
| myChangeSetDepth++; |
| doBeginChangeSet(); |
| return split; |
| } |
| |
| public synchronized boolean endChangeSet(String name) { |
| LocalHistoryLog.LOG.assertTrue(myChangeSetDepth > 0, "not balanced 'begin/end-change set' calls"); |
| |
| myChangeSetDepth--; |
| if (myChangeSetDepth > 0) return false; |
| |
| return doEndChangeSet(name); |
| } |
| |
| private boolean doEndChangeSet(String name) { |
| if (myCurrentChangeSet.isEmpty()) { |
| myCurrentChangeSet = null; |
| return false; |
| } |
| |
| myCurrentChangeSet.setName(name); |
| myCurrentChangeSet.lock(); |
| |
| myStorage.writeNextSet(myCurrentChangeSet); |
| myCurrentChangeSet = null; |
| |
| return true; |
| } |
| |
| @TestOnly |
| public List<ChangeSet> getChangesInTests() { |
| List<ChangeSet> result = new ArrayList<ChangeSet>(); |
| for (ChangeSet each : iterChanges()) { |
| result.add(each); |
| } |
| return result; |
| } |
| |
| // todo synchronization issue: changeset may me modified while being iterated |
| public synchronized Iterable<ChangeSet> iterChanges() { |
| return new Iterable<ChangeSet>() { |
| public Iterator<ChangeSet> iterator() { |
| return new Iterator<ChangeSet>() { |
| private final TIntHashSet recursionGuard = new TIntHashSet(1000); |
| |
| private ChangeSetHolder currentBlock; |
| private ChangeSet next = fetchNext(); |
| |
| public boolean hasNext() { |
| return next != null; |
| } |
| |
| public ChangeSet next() { |
| ChangeSet result = next; |
| next = fetchNext(); |
| return result; |
| } |
| |
| private ChangeSet fetchNext() { |
| if (currentBlock == null) { |
| synchronized (ChangeList.this) { |
| if (myCurrentChangeSet != null) { |
| currentBlock = new ChangeSetHolder(-1, myCurrentChangeSet); |
| } |
| else { |
| currentBlock = myStorage.readPrevious(-1, recursionGuard); |
| } |
| } |
| } |
| else { |
| synchronized (ChangeList.this) { |
| currentBlock = myStorage.readPrevious(currentBlock.id, recursionGuard); |
| } |
| } |
| if (currentBlock == null) return null; |
| return currentBlock.changeSet; |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| }; |
| } |
| |
| public void accept(ChangeVisitor v) { |
| try { |
| for (ChangeSet change : iterChanges()) { |
| change.accept(v); |
| } |
| } |
| catch (ChangeVisitor.StopVisitingException e) { |
| } |
| v.finished(); |
| } |
| |
| public synchronized void purgeObsolete(long period) { |
| myStorage.purge(period, myIntervalBetweenActivities, new Consumer<ChangeSet>() { |
| public void consume(ChangeSet changeSet) { |
| for (Content each : changeSet.getContentsToPurge()) { |
| each.release(); |
| } |
| } |
| }); |
| } |
| |
| @TestOnly |
| public void setIntervalBetweenActivities(int value) { |
| myIntervalBetweenActivities = value; |
| } |
| } |