/**
* Maps blah file with a random offset and checks to see if read from the ByteBuffer gets the
* right line number
*/
private static void testRead() throws Exception {
StringBuilder sb = new StringBuilder();
sb.setLength(4);
for (int x = 0; x < 1000; x++) {
try (FileInputStream fis = new FileInputStream(blah)) {
FileChannel fc = fis.getChannel();
long offset = generator.nextInt(10000);
long expectedResult = offset / CHARS_PER_LINE;
offset = expectedResult * CHARS_PER_LINE;
MappedByteBuffer b = fc.map(MapMode.READ_ONLY, offset, 100);
for (int i = 0; i < 4; i++) {
byte aByte = b.get(i);
sb.setCharAt(i, (char) aByte);
}
int result = Integer.parseInt(sb.toString());
if (result != expectedResult) {
err.println("I expected " + expectedResult);
err.println("I got " + result);
throw new Exception("Read test failed");
}
}
}
}
/**
* Maps blah file with a random offset and checks to see if data written out to the file can be
* read back in
*/
private static void testWrite() throws Exception {
StringBuilder sb = new StringBuilder();
sb.setLength(4);
for (int x = 0; x < 1000; x++) {
try (RandomAccessFile raf = new RandomAccessFile(blah, "rw")) {
FileChannel fc = raf.getChannel();
long offset = generator.nextInt(1000);
MappedByteBuffer b = fc.map(MapMode.READ_WRITE, offset, 100);
for (int i = 0; i < 4; i++) {
b.put(i, (byte) ('0' + i));
}
for (int i = 0; i < 4; i++) {
byte aByte = b.get(i);
sb.setCharAt(i, (char) aByte);
}
if (!sb.toString().equals("0123")) throw new Exception("Write test failed");
}
}
}
private static void testExceptions(FileChannel fc) throws IOException {
checkException(fc, null, 0L, fc.size(), NullPointerException.class);
checkException(fc, MapMode.READ_ONLY, -1L, fc.size(), IllegalArgumentException.class);
checkException(
fc, null, -1L, fc.size(), IllegalArgumentException.class, NullPointerException.class);
checkException(fc, MapMode.READ_ONLY, 0L, -1L, IllegalArgumentException.class);
checkException(fc, null, 0L, -1L, IllegalArgumentException.class, NullPointerException.class);
checkException(
fc, MapMode.READ_ONLY, 0L, Integer.MAX_VALUE + 1L, IllegalArgumentException.class);
checkException(
fc,
null,
0L,
Integer.MAX_VALUE + 1L,
IllegalArgumentException.class,
NullPointerException.class);
checkException(fc, MapMode.READ_ONLY, Long.MAX_VALUE, 1L, IllegalArgumentException.class);
checkException(
fc, null, Long.MAX_VALUE, 1L, IllegalArgumentException.class, NullPointerException.class);
}
private static void testHighOffset() throws Exception {
StringBuilder sb = new StringBuilder();
sb.setLength(4);
for (int x = 0; x < 1000; x++) {
try (RandomAccessFile raf = new RandomAccessFile(blah, "rw")) {
FileChannel fc = raf.getChannel();
long offset = 66000;
MappedByteBuffer b = fc.map(MapMode.READ_WRITE, offset, 100);
}
}
}
/**
* Checks that FileChannel map throws one of the expected exceptions when invoked with the given
* inputs.
*/
private static void checkException(
FileChannel fc, MapMode mode, long position, long size, Class<?>... expected)
throws IOException {
Exception exc = null;
try {
fc.map(mode, position, size);
} catch (Exception actual) {
exc = actual;
}
if (exc != null) {
for (Class<?> clazz : expected) {
if (clazz.isInstance(exc)) {
return;
}
}
}
System.err.println("Expected one of");
for (Class<?> clazz : expected) {
System.out.println(clazz);
}
if (exc == null) {
throw new RuntimeException("No expection thrown");
} else {
throw new RuntimeException("Unexpected exception thrown", exc);
}
}
/** Tests zero size file mapping */
private static void testZero() throws Exception {
try (FileInputStream fis = new FileInputStream(blah)) {
FileChannel fc = fis.getChannel();
MappedByteBuffer b = fc.map(MapMode.READ_ONLY, 0, 0);
}
}
/** Test exceptions specified by map method */
private static void testExceptions() throws Exception {
// check exceptions when channel opened for read access
try (FileChannel fc = FileChannel.open(blah.toPath(), READ)) {
testExceptions(fc);
checkException(fc, MapMode.READ_WRITE, 0L, fc.size(), NonWritableChannelException.class);
checkException(
fc,
MapMode.READ_WRITE,
-1L,
fc.size(),
NonWritableChannelException.class,
IllegalArgumentException.class);
checkException(
fc,
MapMode.READ_WRITE,
0L,
-1L,
NonWritableChannelException.class,
IllegalArgumentException.class);
checkException(fc, MapMode.PRIVATE, 0L, fc.size(), NonWritableChannelException.class);
checkException(
fc,
MapMode.PRIVATE,
-1L,
fc.size(),
NonWritableChannelException.class,
IllegalArgumentException.class);
checkException(
fc,
MapMode.PRIVATE,
0L,
-1L,
NonWritableChannelException.class,
IllegalArgumentException.class);
}
// check exceptions when channel opened for write access
try (FileChannel fc = FileChannel.open(blah.toPath(), WRITE)) {
testExceptions(fc);
checkException(fc, MapMode.READ_ONLY, 0L, fc.size(), NonReadableChannelException.class);
checkException(
fc,
MapMode.READ_ONLY,
-1L,
fc.size(),
NonReadableChannelException.class,
IllegalArgumentException.class);
/*
* implementation/spec mismatch, these tests disabled for now
*/
// checkException(fc, MapMode.READ_WRITE, 0L, fc.size(),
// NonWritableChannelException.class);
// checkException(fc, MapMode.PRIVATE, 0L, fc.size(),
// NonWritableChannelException.class);
}
// check exceptions when channel opened for read and write access
try (FileChannel fc = FileChannel.open(blah.toPath(), READ, WRITE)) {
testExceptions(fc);
}
}
