/*
* Copyright 2003-2013 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 jetbrains.mps.extapi.module;
import jetbrains.mps.components.CoreComponent;
import org.jetbrains.mps.openapi.module.SRepository;
import org.jetbrains.mps.openapi.module.SRepositoryListener;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* evgeny, 5/21/13
*/
public class SRepositoryRegistry implements CoreComponent {
private static SRepositoryRegistry INSTANCE;
private final Object LOCK = new Object();
private Set<SRepository> myRepositories = new LinkedHashSet<SRepository>();
private Set<SRepositoryListener> myGlobalListeners = new LinkedHashSet<SRepositoryListener>();
public static SRepositoryRegistry getInstance() {
return INSTANCE;
}
public SRepositoryRegistry() {
}
@Override
public void init() {
if (INSTANCE != null) {
throw new IllegalStateException("double initialization");
}
INSTANCE = this;
}
@Override
public void dispose() {
INSTANCE = null;
}
public void addRepository(final SRepository repository) {
// listeners may access content of a newly added repository, hence the read lock
// Perhaps, caller shall be responsible for this (need to update method API/documentation then).
repository.getModelAccess().runReadAction(new Runnable() {
@Override
public void run() {
doRepositoryAdd(repository);
}
});
}
public void removeRepository(final SRepository repository) {
repository.getModelAccess().runReadAction(new Runnable() {
@Override
public void run() {
doRepositoryRemove(repository);
}
});
}
void doRepositoryAdd(SRepository repository) {
synchronized (LOCK) {
myRepositories.add(repository);
for (SRepositoryListener l : myGlobalListeners) {
repository.addRepositoryListener(l);
}
}
}
void doRepositoryRemove(SRepository repository) {
synchronized (LOCK) {
for (SRepositoryListener l : myGlobalListeners) {
repository.removeRepositoryListener(l);
}
myRepositories.remove(repository);
}
}
public void addGlobalListener(final SRepositoryListener listener) {
synchronized (LOCK) {
myGlobalListeners.add(listener);
for (final SRepository r : myRepositories) {
r.getModelAccess().runReadAction(new Runnable() {
@Override
public void run() {
r.addRepositoryListener(listener);
}
});
}
}
}
public void removeGlobalListener(final SRepositoryListener listener) {
synchronized (LOCK) {
for (final SRepository r : myRepositories) {
r.getModelAccess().runReadAction(new Runnable() {
@Override
public void run() {
r.removeRepositoryListener(listener);
}
});
}
myGlobalListeners.remove(listener);
}
}
}