我正在使用 VanillaChroncile 临时存储和检索条目，并且一切正常，除非负载很大。我得到地图失败的异常。虽然我有处理这个异常的恢复逻辑，但我想知道为什么我首先得到这个异常。任何帮助将不胜感激。
public enum PreAuthEventChronicle {
INSTANCE;
private String basePath = PropertyUtilsEnum.INSTANCE.getChronicleDirPath();
private final Logger logger = Logger.getLogger(PreAuthEventChronicle.class);
private long indexBlockSize = 64L;
// Length of the excerpt.
private final int excerptLength = 1024;
private final int cycleLength = "yyyyMMddhhmmss";
// Number of entries that are stored in the chronicle queue.
private final long entriesPerCycle = 1L << 20;
// Format for the folder. Chronicle writes in GMT time zone.
private final String format = ApplicationConstants.CHRONICLE_FORMAT;
private Chronicle chronicle = null;
private List<PreAuthEventListener> listeners = new ArrayList<PreAuthEventListener>();
public Chronicle getChr() {
return chronicle;
}
/**
* There can only be one chronicle built.
*/
private PreAuthEventChronicle() {
if (basePath != null) {
if (!basePath.endsWith(ApplicationConstants.FILE_SEP)) {
basePath = basePath + ApplicationConstants.FILE_SEP + ApplicationConstants.CHRONICLE_DATA_PATH;
}
logger.debug("Starting from a clean state");
cleanUp();
logger.debug("Building a Vanilla Chronicle instance with path: " + basePath);
buildChronicle();
} else {
throw new RuntimeException("No directory specified for chronicle to be built.");
}
}
private void buildChronicle() {
logger.debug("Begin-Starting to build a vanilla chronicle");
try {
if (chronicle != null) {
chronicle.clear();
chronicle = null;
}
chronicle = ChronicleQueueBuilder.vanilla(basePath).cycleLength(cycleLength, false).cycleFormat(format)
.indexBlockSize(indexBlockSize).entriesPerCycle(entriesPerCycle).build();
} catch (IOException e) {
logger.error("Error building chronicle" + e.getMessage());
}
logger.debug("End-Finished building the vanilla chronicle");
}
/**
* Clean up the resources
*/
public void cleanUp() {
logger.debug("Begin-Cleaning up chronicle resources");
File f = new File(basePath);
if (f.exists() && f.isDirectory()) {
File[] dirs = f.listFiles();
for (File dir : dirs) {
if (dir.isDirectory()) {
try {
FileUtils.deleteDirectory(dir);
} catch (IOException ignore) {
}
}
}
}
buildChronicle();
logger.debug("End-Done cleaning up chronicle resources");
}
/**
* Write the object to the chronicle queue, and notify the listeners
*
* @param event
* @throws IOException
*/
public synchronized void writeObject(Object event) throws IOException {
ExcerptAppender appender = INSTANCE.getChr().createAppender();
if (appender != null && event != null) {
logger.debug("Begin-Writing event to the chronicle queue");
appender.startExcerpt(excerptLength);
appender.writeObject(event);
appender.finish();
appender.clear();
appender.close();
notifyListeners();
logger.debug("End-Done writing event to the chronicle queue.");
}
}
/**
* Read the object from the queue
*
* @return
* @throws IOException
*/
public synchronized Object readObject() throws IOException {
ExcerptTailer reader = INSTANCE.getChr().createTailer().toStart();
Object evt = null;
while (reader != null && reader.nextIndex()) {
logger.debug("Begin-Reading event from the chronicle queue");
evt = reader.readObject();
reader.finish();
reader.clear();
reader.close();
logger.debug("End-Done reading the event from the chronicle queue.");
}
return evt;
}
/**
* Attach a listener
*
* @param listen
*/
public void attachListener(PreAuthEventListener listen) {
listeners.add(listen);
}
/**
* Notify the listeners that an event has been written.
*/
private void notifyListeners() {
for (PreAuthEventListener listener : listeners) {
logger.debug("Notification received from the chronicle queue. Performing action.");
listener.perform();
}
}
}