write( b, 0, b.length );
    }

    public boolean isOpen()
    {
        return file.isOpen();
    }
    void ensureOpen() throws IOException {
        // ensure file is open
        if( file.isOpen() == false ) {
            file.open( openFlags, access | SmbConstants.FILE_WRITE_DATA, SmbFile.ATTR_NORMAL, 0 );
            if( append ) {
                fp = file.length();

        if( len <= 0 ) {
            return 0;
        }
        long start = fp;

        if( tmp == null ) {
            throw new IOException( "Bad file descriptor" );
        }
        // ensure file is open
        file.open( openFlags, access, SmbFile.ATTR_NORMAL, 0 );

        /*
         * Read AndX Request / Response
         */

        if( file.log.level >= 4 )

var (
	// Global user opts context
	globalServerCtxt serverCtxt

	// Indicates if the running minio server is distributed setup.
	globalIsDistErasure = false

	// Indicates if the running minio server is an erasure-code backend.
	globalIsErasure = false

	// Indicates if the running minio server is in single drive XL mode.
	globalIsErasureSD = false

	// Indicates if server code should go through testing path.

   * garbage-collected, even if there are no more instances of FinalizableReferenceQueue itself.
   * The code in FinalizableReferenceQueue goes to considerable trouble to ensure that there are
   * no such references and the tests here check that that trouble has not been in vain.
   *
   * When we reference FinalizableReferenceQueue in this test, we are referencing a class that is

	config.Net.TLS.Config.InsecureSkipVerify = args.TLS.SkipVerify
	config.Net.TLS.Config.ClientAuth = args.TLS.ClientAuth
	config.Net.TLS.Config.RootCAs = args.TLS.RootCAs

	// These settings are needed to ensure that kafka client doesn't hang on brokers
	// refer https://github.com/IBM/sarama/issues/765#issuecomment-254333355
	config.Producer.Retry.Max = 2
	config.Producer.Retry.Backoff = (1 * time.Second)

	if !dm.GetLock(context.Background(), nil, id, source, Options{Timeout: 5 * time.Minute}) {
		t.Fatal("GetLock() should be successful")
	}

	// Add delay to lock server responses to ensure that lock does not timeout
	for i := range lockServers {
		lockServers[i].setResponseDelay(5 * testDrwMutexUnlockCallTimeout)
		defer lockServers[i].setResponseDelay(0)
	}

	unlockReturned := make(chan struct{}, 1)

	// allocated slice, but this pattern causes b to escape onto the heap.
	//
	// Instead use the append-make pattern with a nil slice to ensure that
	// we allocate buffers rounded up to the closest size class.
	c := len(b) + n // ensure enough space for n elements
	if c < 2*cap(b) {
		// The growth rate has historically always been 2x. In the future,

 * if it is present on the connection spec. The same policy also applies to cipher suites.
 *
 * Use [Builder.allEnabledTlsVersions] and [Builder.allEnabledCipherSuites] to defer all feature
 * selection to the underlying SSL socket.
 *
 * The configuration of each spec changes with each OkHttp release. This is annoying: upgrading

      TestCharSource okSource = new TestCharSource(STRING);
      assertThrows(IOException.class, () -> okSource.copyTo(new TestCharSink(option)));
      // ensure reader was closed IF it was opened (depends on implementation whether or not it's
      // opened at all if sink.newWriter() throws).
      assertTrue(
          "stream not closed when copying to sink with option: " + option,

<img src="/img/tutorial/body/image04.png">

This is not by chance, the whole framework was built around that design.

And it was thoroughly tested at the design phase, before any implementation, to ensure it would work with all the editors.

There were even some changes to Pydantic itself to support this.