ppkarwasz commented on code in PR #748:
URL: https://github.com/apache/commons-io/pull/748#discussion_r2094128921
##########
src/main/java/org/apache/commons/io/input/QueueInputStream.java:
##########
@@ -224,4 +226,52 @@ public int read() {
}
}
+ /**
+ * Reads up to {@code length} bytes of data from the input stream into
+ * an array of bytes. The first byte is read while honoring the timeout;
the rest are read while <i>not</i> honoring
+ * the timeout. The number of bytes actually read is returned as an
integer.
+ *
+ * @param b the buffer into which the data is read.
+ * @param offset the start offset in array {@code b} at which the data
is written.
+ * @param length the maximum number of bytes to read.
+ * @return the total number of bytes read into the buffer, or {@code
-1} if there is no more data because the
+ * end of the stream has been reached.
+ * @throws IllegalStateException if thread is interrupted while waiting
for the first byte.
+ * @throws IndexOutOfBoundsException if {@code offset} is negative, {@code
length} is negative, or {@code length} is
+ * greater than {@code b.length - offset}.
+ */
+ @Override
+ public int read(byte[] b, int offset, int length) {
+ if (offset > b.length || offset < 0) {
+ throw new IndexOutOfBoundsException("Offset out of bounds: " +
offset);
+ }
+ if (length < 0 || length > b.length - offset) {
+ throw new IndexOutOfBoundsException("Length out of bounds: " +
length);
+ }
+
+ int i = 0;
+ if (length > 0) {
+ // read the first value, honoring the timeout
+ final int firstValue = read();
+ if (firstValue == EOF) {
+ return EOF;
+ }
+ b[offset + i] = (byte) (0xFF & firstValue);
+ i++;
+ }
+
+ if (length > 1) {
+ // read the rest, ignoring the timeout
+ final List<Integer> drain = new ArrayList<>(length * 2);
+ blockingQueue.drainTo(drain, length - 1);
Review Comment:
Nicely done! :100:
I have two questions:
- Why is the initial capacity of the list **twice** the number of expected
elements?
- Would it make sense to store the list in a field to avoid recreating it on
each call? Unless I'm missing something, `QueueInputStream` doesn't appear to
support concurrent reads, so we might not need to worry about thread safety in
this case.
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