| /* |
| * 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.openapi.vcs; |
| |
| import com.intellij.openapi.Disposable; |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.util.Disposer; |
| import com.intellij.util.ThreeState; |
| import com.intellij.util.ThrowableRunnable; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * By the nature of the process, we do not expect here situations where one thread activates/starts and another simultaneosly |
| * tries to deactivate/shutdown. It that situations, it would be very hard to decide what should be done=) |
| * |
| * So, synchronization here should only be used as a barrier to do not allow repeated activation etc. |
| * - and "actual" methods should not be called under lock |
| */ |
| public abstract class StartedActivated { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.vcs.StartedActivated"); |
| |
| private final MySection myStart; |
| private final MySection myActivate; |
| private final Object myLock; |
| |
| protected StartedActivated(final Disposable parent) { |
| myStart = new MySection(new ThrowableRunnable<VcsException>() { |
| public void run() throws VcsException { |
| start(); |
| } |
| }, new ThrowableRunnable<VcsException>() { |
| public void run() throws VcsException { |
| shutdown(); |
| } |
| }); |
| myActivate = new MySection(new ThrowableRunnable<VcsException>() { |
| public void run() throws VcsException { |
| activate(); |
| } |
| }, new ThrowableRunnable<VcsException>() { |
| public void run() throws VcsException { |
| deactivate(); |
| } |
| }); |
| myStart.setDependent(myActivate); |
| myActivate.setMaster(myStart); |
| |
| myLock = new Object(); |
| |
| Disposer.register(parent, new Disposable() { |
| public void dispose() { |
| try { |
| doShutdown(); |
| } |
| catch (Throwable t) { |
| LOG.info(t); |
| } |
| } |
| }); |
| } |
| |
| // for tests only |
| protected StartedActivated() { |
| myStart = null; |
| myActivate = null; |
| myLock = null; |
| } |
| |
| protected abstract void start() throws VcsException; |
| protected abstract void shutdown() throws VcsException; |
| protected abstract void activate() throws VcsException; |
| protected abstract void deactivate() throws VcsException; |
| |
| private void callImpl(final MySection section, final boolean start) throws VcsException { |
| final List<ThrowableRunnable<VcsException>> list = new ArrayList<ThrowableRunnable<VcsException>>(2); |
| synchronized (myLock) { |
| if (start) { |
| section.start(list); |
| } else { |
| section.stop(list); |
| } |
| } |
| for (ThrowableRunnable<VcsException> runnable : list) { |
| runnable.run(); |
| } |
| } |
| |
| public final void doStart() throws VcsException { |
| callImpl(myStart, true); |
| } |
| |
| public final void doShutdown() throws VcsException { |
| callImpl(myStart, false); |
| } |
| |
| public final void doActivate() throws VcsException { |
| callImpl(myActivate, true); |
| } |
| |
| public final void doDeactivate() throws VcsException { |
| callImpl(myActivate, false); |
| } |
| |
| private static class MySection { |
| private MySection myMaster; |
| private MySection myDependent; |
| |
| private final ThrowableRunnable<VcsException> myStart; |
| private final ThrowableRunnable<VcsException> myStop; |
| |
| private ThreeState myState; |
| |
| public MySection(final ThrowableRunnable<VcsException> start, final ThrowableRunnable<VcsException> stop) { |
| myStart = start; |
| myStop = stop; |
| myState = ThreeState.UNSURE; |
| } |
| |
| public void start(final List<ThrowableRunnable<VcsException>> callList) { |
| if (myMaster != null) { |
| myMaster.start(callList); |
| } |
| if (! ThreeState.YES.equals(myState)) { |
| myState = ThreeState.YES; |
| callList.add(myStart); |
| } |
| } |
| |
| public void stop(final List<ThrowableRunnable<VcsException>> callList) { |
| if (myDependent != null) { |
| myDependent.stop(callList); |
| } |
| if (ThreeState.YES.equals(myState)) { |
| myState = ThreeState.NO; |
| callList.add(myStop); |
| } |
| } |
| |
| public void setMaster(MySection master) { |
| myMaster = master; |
| } |
| |
| public void setDependent(MySection dependent) { |
| myDependent = dependent; |
| } |
| } |
| } |