Examples of org.apache.lucene.store.Lock.obtain()

org.apache.lucene.store.Lock.obtain()
Attempts to obtain exclusive access and immediately return upon success or failure. @return true iff exclusive access is obtained

    if (stale)
      throw new IOException("IndexReader out of date and no longer valid for delete, undelete, or setNorm operations");


    if (writeLock == null) {
      Lock writeLock = directory.makeLock(IndexWriter.WRITE_LOCK_NAME);
      if (!writeLock.obtain(IndexWriter.WRITE_LOCK_TIMEOUT)) // obtain write lock
        throw new IOException("Index locked for write: " + writeLock);
      this.writeLock = writeLock;


      // we have to check whether index has changed since this reader was opened.
      // if so, this reader is no longer valid for deletion

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      this.closeDir = closeDir;
      directory = d;
      analyzer = a;


      Lock writeLock = directory.makeLock(IndexWriter.WRITE_LOCK_NAME);
      if (!writeLock.obtain(WRITE_LOCK_TIMEOUT)) // obtain write lock
        throw new IOException("Index locked for write: " + writeLock);
      this.writeLock = writeLock;                   // save it


      synchronized (directory) {        // in- & inter-process sync
        new Lock.With(directory.makeLock(IndexWriter.COMMIT_LOCK_NAME), COMMIT_LOCK_TIMEOUT) {

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      this.closeDir = closeDir;
      directory = d;
      analyzer = a;


      Lock writeLock = directory.makeLock(IndexWriter.WRITE_LOCK_NAME);
      if (!writeLock.obtain(WRITE_LOCK_TIMEOUT)) // obtain write lock
        throw new IOException("Index locked for write: " + writeLock);
      this.writeLock = writeLock;                   // save it


      synchronized (directory) {        // in- & inter-process sync
        new Lock.With(directory.makeLock(IndexWriter.COMMIT_LOCK_NAME), COMMIT_LOCK_TIMEOUT) {

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      if (stale)
        throw new StaleReaderException("IndexReader out of date and no longer valid for delete, undelete, or setNorm operations");
  
      if (writeLock == null) {
        Lock writeLock = directory.makeLock(IndexWriter.WRITE_LOCK_NAME);
        if (!writeLock.obtain(IndexWriter.WRITE_LOCK_TIMEOUT)) // obtain write lock
          throw new LockObtainFailedException("Index locked for write: " + writeLock);
        this.writeLock = writeLock;
  
        // we have to check whether index has changed since this reader was opened.
        // if so, this reader is no longer valid for deletion

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      // Clear the write lock in case it's leftover:
      directory.clearLock(WRITE_LOCK_NAME);
    }


    Lock writeLock = directory.makeLock(WRITE_LOCK_NAME);
    if (!writeLock.obtain(writeLockTimeout)) // obtain write lock
      throw new LockObtainFailedException("Index locked for write: " + writeLock);
    this.writeLock = writeLock;                   // save it


    try {
      if (create) {

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      if (stale)
        throw new StaleReaderException("IndexReader out of date and no longer valid for delete, undelete, or setNorm operations");
  
      if (writeLock == null) {
        Lock writeLock = directory.makeLock(IndexWriter.WRITE_LOCK_NAME);
        if (!writeLock.obtain(IndexWriter.WRITE_LOCK_TIMEOUT)) // obtain write lock
          throw new LockObtainFailedException("Index locked for write: " + writeLock);
        this.writeLock = writeLock;
  
        // we have to check whether index has changed since this reader was opened.
        // if so, this reader is no longer valid for deletion

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      if (stale)
        throw new StaleReaderException("IndexReader out of date and no longer valid for delete, undelete, or setNorm operations");


      if (writeLock == null) {
        Lock writeLock = directory.makeLock(IndexWriter.WRITE_LOCK_NAME);
        if (!writeLock.obtain(IndexWriterConfig.WRITE_LOCK_TIMEOUT)) // obtain write lock
          throw new LockObtainFailedException("Index locked for write: " + writeLock);
        this.writeLock = writeLock;


        // we have to check whether index has changed since this reader was opened.
        // if so, this reader is no longer valid for

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              dicHome);
          Lock lock = FileLockFactory.makeLock(LOCK_FILE);


          boolean obtained = false;
          try {
            obtained = lock.obtain(90000);
            if (obtained) {
              // 编译词典-对词典进行可能的处理，以符合分词器的要求
              if (compiler.shouldCompile(p)) {
                Dictionaries dictionaries = readUnCompiledDictionaries(p);
                Paoding tempPaoding = createPaodingWithKnives(p);

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      Lock commitLock=directory.makeLock(IndexWriter.COMMIT_LOCK_NAME);
      
      boolean locked=false;
      
      try {
         locked=commitLock.obtain(IndexWriter.COMMIT_LOCK_TIMEOUT);
         
         return SegmentInfos.readCurrentVersion(directory);
      } finally {
        if (locked) {
          commitLock.release();

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      Lock commitLock=directory.makeLock(IndexWriter.COMMIT_LOCK_NAME);
      
      boolean locked=false;
      
      try {
         locked=commitLock.obtain(IndexWriter.COMMIT_LOCK_TIMEOUT);
         
         return SegmentInfos.readCurrentVersion(directory) == segmentInfos.getVersion();
      } finally {
        if (locked) {
          commitLock.release();

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