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/*
* 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.tuscany.sca.impl.hotupdate;
import java.io.File;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.tuscany.sca.Node;
import org.apache.tuscany.sca.impl.NodeImpl;
/**
* Code to do dynamic updates to a running Node.
* Very experimental presently, mainly just to see what type of things are required
*/
public class HotUpdater {
private final Node node;
private final File domainDir;
// key is contribution URI (which for exploded contributions is the directory name)
private final Map<String, LastModifiedTracker> contributions = new HashMap<String, LastModifiedTracker>();
private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
public HotUpdater(Node node, File domainDir){
this.node = node;
this.domainDir = domainDir;
final Runnable checker = new Runnable() {
public void run() {
check();
}
};
scheduler.scheduleAtFixedRate(checker, 10, 10, TimeUnit.SECONDS);
}
private void check() {
Set<String> found = new HashSet<String>();
for (File f : domainDir.listFiles()) {
if (f.isDirectory() && !f.getName().startsWith(".")) {
found.add(f.getName());
LastModifiedTracker scanner = contributions.get(f.getName());
if (scanner == null) {
//newContribution(f);
contributions.put(f.getName(), new LastModifiedTracker(f));
} else {
if (scanner.checkModified()) {
updatedContribution(f);
}
}
}
}
HashSet<String> removed = new HashSet<String>(contributions.keySet());
removed.removeAll(found);
for (String curi : removed) {
removedContribution(curi);
}
}
private void removedContribution(String curi) {
try {
((NodeImpl)node).uninstallContribution(curi, true);
} catch (Exception e) {
e.printStackTrace();
}
contributions.remove(curi);
}
private void updatedContribution(File f) {
try {
((NodeImpl)node).updateContribution(f.getName(), f.toURI().toURL().toString(), null, null);
} catch (Exception e) {
e.printStackTrace();
}
}
private void newContribution(File f) {
try {
node.installContribution(f.getName(), f.toURI().toURL().toString(), null, null);
node.startDeployables(f.getName());
} catch (Exception e) {
e.printStackTrace();
}
}
}
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