/*
* 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.sling.distribution.queue.impl.simple;
import java.io.File;
import java.io.FileOutputStream;
import java.io.StringWriter;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Map;
import org.apache.commons.io.IOUtils;
import org.apache.sling.commons.json.io.JSONWriter;
import org.apache.sling.distribution.queue.DistributionQueue;
import org.apache.sling.distribution.queue.DistributionQueueEntry;
import org.apache.sling.distribution.queue.DistributionQueueItem;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A light checkpointing of a {@link SimpleDistributionQueue} to {@link File}
*/
class SimpleDistributionQueueCheckpoint implements Runnable {
private static final Logger log = LoggerFactory.getLogger(SimpleDistributionQueueCheckpoint.class);
private final DistributionQueue queue;
private final File checkpointDirectory;
public SimpleDistributionQueueCheckpoint(DistributionQueue queue, File checkpointDirectory) {
this.queue = queue;
this.checkpointDirectory = checkpointDirectory;
}
@Override
public void run() {
String fileName = queue.getName() + "-checkpoint";
File checkpointFile = new File(checkpointDirectory, fileName + "-new");
log.debug("started checkpointing");
try {
if (checkpointFile.exists()) {
assert checkpointFile.delete();
}
assert checkpointFile.createNewFile();
Collection<String> lines = new LinkedList<String>();
FileOutputStream fileOutputStream = new FileOutputStream(checkpointFile);
for (DistributionQueueEntry queueEntry : queue.getItems(0, -1)) {
DistributionQueueItem item = queueEntry.getItem();
String packageId = item.getPackageId();
StringWriter w = new StringWriter();
JSONWriter jsonWriter = new JSONWriter(w);
jsonWriter.object();
for (Map.Entry<String, Object> entry : item.entrySet()) {
jsonWriter.key(entry.getKey());
Object value = entry.getValue();
boolean isArray = value instanceof String[];
if (isArray) {
jsonWriter.array();
for (String s : ((String[]) value)) {
jsonWriter.value(s);
}
jsonWriter.endArray();
} else {
jsonWriter.value(value);
}
}
jsonWriter.endObject();
lines.add(packageId + " " + w.toString());
}
log.debug("parsed {} items", lines.size());
IOUtils.writeLines(lines, Charset.defaultCharset().name(), fileOutputStream, Charset.defaultCharset());
fileOutputStream.flush();
fileOutputStream.close();
boolean success = checkpointFile.renameTo(new File(checkpointDirectory, fileName));
log.debug("checkpoint succeeded: {}", success);
} catch (Exception e) {
log.error("failed checkpointing for queue {}", queue.getName());
}
}
}