Examples with FileChannel java.nio.channels.FileChannel used on opensource projects

Example 51 with FileChannel

use of java.nio.channels.FileChannel in project jimfs by google.

the class JimfsFileChannelTest method testRead.

@Test
public void testRead() throws IOException {
    RegularFile file = regularFile(20);
    FileChannel channel = channel(file, READ);
    assertEquals(0, channel.position());
    ByteBuffer buf = buffer("1234567890");
    ByteBuffer buf2 = buffer("123457890");
    assertEquals(10, channel.read(buf));
    assertEquals(10, channel.position());
    buf.flip();
    assertEquals(10, channel.read(new ByteBuffer[] { buf, buf2 }));
    assertEquals(20, channel.position());
    buf.flip();
    buf2.flip();
    file.write(20, new byte[10], 0, 10);
    assertEquals(10, channel.read(new ByteBuffer[] { buf, buf2 }, 0, 2));
    assertEquals(30, channel.position());
    buf.flip();
    assertEquals(10, channel.read(buf, 5));
    assertEquals(30, channel.position());
    buf.flip();
    assertEquals(-1, channel.read(buf));
    assertEquals(30, channel.position());
}

Example 52 with FileChannel

use of java.nio.channels.FileChannel in project jimfs by google.

the class JimfsFileChannelTest method assertClosedByInterrupt.

/**
   * Asserts that when the given operation is run on an interrupted thread,
   * {@code ClosedByInterruptException} is thrown, the channel is closed and the thread is no
   * longer interrupted.
   */
private static void assertClosedByInterrupt(FileChannelMethod method) throws IOException {
    FileChannel channel = channel(regularFile(10), READ, WRITE);
    Thread.currentThread().interrupt();
    try {
        method.call(channel);
        fail("expected the method to throw ClosedByInterruptException or " + "FileLockInterruptionException");
    } catch (ClosedByInterruptException | FileLockInterruptionException expected) {
        assertFalse("expected the channel to be closed", channel.isOpen());
        assertTrue("expected the thread to still be interrupted", Thread.interrupted());
    } finally {
        // ensure the thread isn't interrupted when this method returns
        Thread.interrupted();
    }
}

Example 53 with FileChannel

use of java.nio.channels.FileChannel in project jimfs by google.

the class JimfsFileChannelTest method testSize.

@Test
public void testSize() throws IOException {
    RegularFile file = regularFile(10);
    FileChannel channel = channel(file, READ);
    assertEquals(10, channel.size());
    file.write(10, new byte[90], 0, 90);
    assertEquals(100, channel.size());
}

Example 54 with FileChannel

use of java.nio.channels.FileChannel in project jimfs by google.

the class JimfsFileChannelTest method testTransferFromNegative.

@Test
public void testTransferFromNegative() throws IOException {
    FileChannel channel = channel(regularFile(0), READ, WRITE);
    try {
        channel.transferFrom(new ByteBufferChannel(10), -1, 0);
        fail();
    } catch (IllegalArgumentException expected) {
    }
    try {
        channel.transferFrom(new ByteBufferChannel(10), 0, -1);
        fail();
    } catch (IllegalArgumentException expected) {
    }
}

Example 55 with FileChannel

use of java.nio.channels.FileChannel in project jimfs by google.

the class JimfsFileChannelTest method testTransferFrom.

@Test
public void testTransferFrom() throws IOException {
    RegularFile file = regularFile(0);
    FileChannel channel = channel(file, WRITE);
    ByteBufferChannel readChannel = new ByteBufferChannel(buffer("1234567890"));
    assertEquals(10, channel.transferFrom(readChannel, 0, 100));
    assertEquals(0, channel.position());
}