| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.qpid.server.store.berkeleydb; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.qpid.server.store.StoreException; |
| |
| /** |
| * JE permits the same environment to opened for write many times from within the same JVM. |
| * The Apache Qpid Broker-J needs to disallow this as the stores of many VHNs or many VH |
| */ |
| public class EnvHomeRegistry |
| { |
| private static final EnvHomeRegistry _instance = new EnvHomeRegistry(); |
| private final Set<String> _canonicalNames = new HashSet<>(); |
| |
| public static final EnvHomeRegistry getInstance() |
| { |
| return _instance; |
| } |
| |
| // default for unit testing |
| EnvHomeRegistry() |
| { |
| super(); |
| } |
| |
| public synchronized void registerHome(final File home) throws StoreException |
| { |
| if (home == null) |
| { |
| throw new IllegalArgumentException("home parameter cannot be null"); |
| } |
| |
| String canonicalForm = getCanonicalForm(home); |
| if (_canonicalNames.contains(canonicalForm)) |
| { |
| throw new IllegalArgumentException("JE Home " + home + " is already in use"); |
| } |
| _canonicalNames.add(canonicalForm); |
| } |
| |
| |
| public synchronized void deregisterHome(final File home) throws StoreException |
| { |
| if (home == null) |
| { |
| throw new IllegalArgumentException("home parameter cannot be null"); |
| } |
| |
| String canonicalForm = getCanonicalForm(home); |
| _canonicalNames.remove(canonicalForm); |
| } |
| |
| private String getCanonicalForm(final File home) |
| { |
| try |
| { |
| return home.getCanonicalPath(); |
| } |
| catch (IOException e) |
| { |
| throw new StoreException("Failed to resolve " + home + " into canonical form", e); |
| } |
| } |
| |
| } |