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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.facelets.impl;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Logger;
import com.sun.faces.util.ConcurrentCache;
import com.sun.faces.util.ExpiringConcurrentCache;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;
import jakarta.faces.FacesException;
import jakarta.faces.view.facelets.FaceletCache;
/**
* Default FaceletCache implementation.
*/
final class DefaultFaceletCache extends FaceletCache {
private final static Logger LOGGER = FacesLogger.FACELETS_FACTORY.getLogger();
/**
* Constructor
*
* @param refreshPeriod cache refresh period (in seconds). 0 means 'always refresh', negative value means 'never
* refresh'
*/
DefaultFaceletCache(final long refreshPeriod) {
// We will be delegating object storage to the ExpiringCocurrentCache
// Create Factory objects here for the cache. The objects will be delegating to our
// own instance factories
final boolean checkExpiry = refreshPeriod > 0;
ConcurrentCache.Factory faceletFactory = key -> {
// Make sure that the expensive timestamp retrieval is not done
// if no expiry check is going to be performed
long lastModified = checkExpiry ? Util.getLastModified(key) : 0;
return new Record(System.currentTimeMillis(), lastModified, getMemberFactory().newInstance(key), refreshPeriod);
};
ConcurrentCache.Factory metadataFaceletFactory = key -> {
// Make sure that the expensive timestamp retrieval is not done
// if no expiry check is going to be performed
long lastModified = checkExpiry ? Util.getLastModified(key) : 0;
return new Record(System.currentTimeMillis(), lastModified, getMetadataMemberFactory().newInstance(key), refreshPeriod);
};
// No caching if refreshPeriod is 0
if (refreshPeriod == 0) {
_faceletCache = new NoCache(faceletFactory);
_metadataFaceletCache = new NoCache(metadataFaceletFactory);
} else {
ExpiringConcurrentCache.ExpiryChecker checker = refreshPeriod > 0 ? new ExpiryChecker() : new NeverExpired();
_faceletCache = new ExpiringConcurrentCache<>(faceletFactory, checker);
_metadataFaceletCache = new ExpiringConcurrentCache<>(metadataFaceletFactory, checker);
}
}
@Override
public DefaultFacelet getFacelet(URL url) throws IOException {
com.sun.faces.util.Util.notNull("url", url);
DefaultFacelet f = null;
try {
f = _faceletCache.get(url).getFacelet();
} catch (ExecutionException e) {
_unwrapIOException(e);
}
return f;
}
@Override
public boolean isFaceletCached(URL url) {
com.sun.faces.util.Util.notNull("url", url);
return _faceletCache.containsKey(url);
}
@Override
public DefaultFacelet getViewMetadataFacelet(URL url) throws IOException {
com.sun.faces.util.Util.notNull("url", url);
DefaultFacelet f = null;
try {
f = _metadataFaceletCache.get(url).getFacelet();
} catch (ExecutionException e) {
_unwrapIOException(e);
}
return f;
}
@Override
public boolean isViewMetadataFaceletCached(URL url) {
com.sun.faces.util.Util.notNull("url", url);
return _metadataFaceletCache.containsKey(url);
}
private void _unwrapIOException(ExecutionException e) throws IOException {
Throwable t = e.getCause();
if (t instanceof IOException) {
throw (IOException) t;
}
if (t.getCause() instanceof IOException) {
throw (IOException) t.getCause();
}
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
}
throw new FacesException(t);
}
private final ConcurrentCache _faceletCache;
private final ConcurrentCache _metadataFaceletCache;
/**
* This class holds the Facelet instance and its original URL's last modified time. It also produces the time when the
* next expiry check should be performed
*/
private static class Record {
Record(long creationTime, long lastModified, DefaultFacelet facelet, long refreshInterval) {
_facelet = facelet;
_creationTime = creationTime;
_lastModified = lastModified;
_refreshInterval = refreshInterval;
// There is no point in calculating the next refresh time if we are refreshing always/never
_nextRefreshTime = _refreshInterval > 0 ? new AtomicLong(creationTime + refreshInterval) : null;
}
DefaultFacelet getFacelet() {
return _facelet;
}
long getLastModified() {
return _lastModified;
}
long getNextRefreshTime() {
// There is no point in calculating the next refresh time if we are refreshing always/never
return _refreshInterval > 0 ? _nextRefreshTime.get() : 0;
}
long getAndUpdateNextRefreshTime() {
// There is no point in calculating the next refresh time if we are refreshing always/never
return _refreshInterval > 0 ? _nextRefreshTime.getAndSet(System.currentTimeMillis() + _refreshInterval) : 0;
}
private final long _lastModified;
private final long _refreshInterval;
private final long _creationTime;
private final AtomicLong _nextRefreshTime;
private final DefaultFacelet _facelet;
}
private static class ExpiryChecker implements ExpiringConcurrentCache.ExpiryChecker {
@Override
public boolean isExpired(URL url, Record record) {
if (System.currentTimeMillis() > record.getNextRefreshTime()) {
record.getAndUpdateNextRefreshTime();
long lastModified = Util.getLastModified(url);
// The record is considered expired if its original last modified time
// is older than the URL's current last modified time
return lastModified > record.getLastModified();
}
return false;
}
}
private static class NeverExpired implements ExpiringConcurrentCache.ExpiryChecker {
@Override
public boolean isExpired(URL key, Record value) {
return false;
}
}
/**
* ConcurrentCache implementation that does no caching (always creates new instances)
*/
private static class NoCache extends ConcurrentCache {
public NoCache(ConcurrentCache.Factory f) {
super(f);
}
@Override
public Record get(final URL key) throws ExecutionException {
try {
return getFactory().newInstance(key);
} catch (Exception e) {
throw new ExecutionException(e);
}
}
@Override
public boolean containsKey(final URL key) {
return false;
}
}
}