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

      // 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        throw new StaleReaderException("IndexReader out of date and no longer valid for delete, undelete, or setNorm operations");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        // if so, this reader is no longer valid for deletion

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    reflected in the {@link #docFreq} statistic, though
    this will be corrected eventually as the index is further modified.  */
  public synchronized final void delete(int docNum) throws IOException {
    if (writeLock == null) {
      Lock writeLock = directory.makeLock("write.lock");
      if (!writeLock.obtain())        // obtain write lock
        throw new IOException("Index locked for write: " + writeLock);
      this.writeLock = writeLock;
    }
    doDelete(docNum);
  }

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       throws IOException {
    directory = d;
    analyzer = a;


    Lock writeLock = directory.makeLock("write.lock");
    if (!writeLock.obtain())                      // 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("commit.lock")) {

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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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