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/*
* Copyright 2000-2013 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.wm.impl;
import com.intellij.openapi.application.Application;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.application.ModalityState;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.Condition;
import com.intellij.openapi.util.registry.Registry;
import com.intellij.openapi.wm.impl.commands.FinalizableCommand;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.List;
public final class CommandProcessor implements Runnable {
private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.wm.impl.CommandProcessor");
private final Object myLock = new Object();
private final List<CommandGroup> myCommandGroupList = new ArrayList<CommandGroup>();
private int myCommandCount;
public final int getCommandCount() {
synchronized (myLock) {
return myCommandCount;
}
}
/**
* Executes passed batch of commands. Note, that the processor surround the
* commands with BlockFocusEventsCmd - UnbockFocusEventsCmd. It's required to
* prevent focus handling of events which is caused by the commands to be executed.
*/
public final void execute(@NotNull List<FinalizableCommand> commandList, @NotNull Condition expired) {
synchronized (myLock) {
final boolean isBusy = myCommandCount > 0;
final CommandGroup commandGroup = new CommandGroup(commandList, expired);
myCommandGroupList.add(commandGroup);
myCommandCount += commandList.size();
if (!isBusy) {
run();
}
}
}
public final void run() {
synchronized (myLock) {
final CommandGroup commandGroup = getNextCommandGroup();
if (commandGroup == null || commandGroup.isEmpty()) return;
final Condition conditionForGroup = commandGroup.getExpireCondition();
final FinalizableCommand command = commandGroup.takeNextCommand();
myCommandCount--;
final Condition expire = command.getExpireCondition() != null ? command.getExpireCondition() : conditionForGroup;
if (LOG.isDebugEnabled()) {
LOG.debug("CommandProcessor.run " + command);
}
// max. I'm not actually quite sure this should have NON_MODAL modality but it should
// definitely have some since runnables in command list may (and do) request some PSI activity
final boolean queueNext = myCommandCount > 0;
Application application = ApplicationManager.getApplication();
ModalityState modalityState = Registry.is("ide.perProjectModality") ? ModalityState.defaultModalityState() : ModalityState.NON_MODAL;
application.getInvokator().invokeLater(command, modalityState, expire == null ? application.getDisposed() : expire).doWhenDone(new Runnable() {
public void run() {
if (queueNext) {
CommandProcessor.this.run();
}
}
});
}
}
@Nullable
private CommandGroup getNextCommandGroup() {
while (!myCommandGroupList.isEmpty()) {
final CommandGroup candidate = myCommandGroupList.get(0);
if (!candidate.isEmpty()) {
return candidate;
}
myCommandGroupList.remove(candidate);
}
return null;
}
private static class CommandGroup {
private final List<FinalizableCommand> myList;
private Condition myExpireCondition;
private CommandGroup(@NotNull List<FinalizableCommand> list, @NotNull Condition expireCondition) {
myList = list;
myExpireCondition = expireCondition;
}
public Condition getExpireCondition() {
return myExpireCondition;
}
public boolean isEmpty() {
return myList.isEmpty();
}
public FinalizableCommand takeNextCommand() {
FinalizableCommand command = myList.remove(0);
if (isEmpty()) {
// memory leak otherwise
myExpireCondition = Condition.TRUE;
}
return command;
}
}
}
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