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testDiscardReadBytes() — netty Function Reference

Architecture documentation for the testDiscardReadBytes() function in AbstractByteBufTest.java from the netty codebase.

Function java Buffer Search calls 1

Entity Profile

Dependency Diagram

graph TD
  532ddb9c_3aa0_8339_e6e0_8cacad748c0d["testDiscardReadBytes()"]
  6540f2d1_cdad_6705_dd1d_9a24e2e53242["AbstractByteBufTest"]
  532ddb9c_3aa0_8339_e6e0_8cacad748c0d -->|defined in| 6540f2d1_cdad_6705_dd1d_9a24e2e53242
  2b6460c6_430a_5883_133d_f9b926ce9ad4["discardReadBytesDoesNotMoveWritableBytes()"]
  532ddb9c_3aa0_8339_e6e0_8cacad748c0d -->|calls| 2b6460c6_430a_5883_133d_f9b926ce9ad4
  style 532ddb9c_3aa0_8339_e6e0_8cacad748c0d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

buffer/src/test/java/io/netty/buffer/AbstractByteBufTest.java lines 1928–1975

    @Test
    public void testDiscardReadBytes() {
        buffer.writerIndex(0);
        for (int i = 0; i < buffer.capacity(); i += 4) {
            buffer.writeInt(i);
        }
        ByteBuf copy = copiedBuffer(buffer);

        // Make sure there's no effect if called when readerIndex is 0.
        buffer.readerIndex(CAPACITY / 4);
        buffer.markReaderIndex();
        buffer.writerIndex(CAPACITY / 3);
        buffer.markWriterIndex();
        buffer.readerIndex(0);
        buffer.writerIndex(CAPACITY / 2);
        buffer.discardReadBytes();

        assertEquals(0, buffer.readerIndex());
        assertEquals(CAPACITY / 2, buffer.writerIndex());
        assertEquals(copy.slice(0, CAPACITY / 2), buffer.slice(0, CAPACITY / 2));
        buffer.resetReaderIndex();
        assertEquals(CAPACITY / 4, buffer.readerIndex());
        buffer.resetWriterIndex();
        assertEquals(CAPACITY / 3, buffer.writerIndex());

        // Make sure bytes after writerIndex is not copied.
        buffer.readerIndex(1);
        buffer.writerIndex(CAPACITY / 2);
        buffer.discardReadBytes();

        assertEquals(0, buffer.readerIndex());
        assertEquals(CAPACITY / 2 - 1, buffer.writerIndex());
        assertEquals(copy.slice(1, CAPACITY / 2 - 1), buffer.slice(0, CAPACITY / 2 - 1));

        if (discardReadBytesDoesNotMoveWritableBytes()) {
            // If writable bytes were copied, the test should fail to avoid unnecessary memory bandwidth consumption.
            assertFalse(copy.slice(CAPACITY / 2, CAPACITY / 2).equals(buffer.slice(CAPACITY / 2 - 1, CAPACITY / 2)));
        } else {
            assertEquals(copy.slice(CAPACITY / 2, CAPACITY / 2), buffer.slice(CAPACITY / 2 - 1, CAPACITY / 2));
        }

        // Marks also should be relocated.
        buffer.resetReaderIndex();
        assertEquals(CAPACITY / 4 - 1, buffer.readerIndex());
        buffer.resetWriterIndex();
        assertEquals(CAPACITY / 3 - 1, buffer.writerIndex());
        copy.release();
    }

Domain

Subdomains

Defined In

Calls

Source

Frequently Asked Questions

What does testDiscardReadBytes() do?
testDiscardReadBytes() is a function in the netty codebase, defined in buffer/src/test/java/io/netty/buffer/AbstractByteBufTest.java.
Where is testDiscardReadBytes() defined?
testDiscardReadBytes() is defined in buffer/src/test/java/io/netty/buffer/AbstractByteBufTest.java at line 1928.
What does testDiscardReadBytes() call?
testDiscardReadBytes() calls 1 function(s): discardReadBytesDoesNotMoveWritableBytes.

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