FileSnapshot#equals: consider UNKNOWN_SIZE
Add a unittest. In commit I5485db55 ("Fix FileSnapshot's consideration of file size"), the special casing of UNKNOWN_SIZE was forgotten. This change, together with I493f3b57b ("Measure file timestamp resolution used in FileSnapshot") introduced a regression that would occasionally surface in Gerrit integration tests marked UseLocalDisk, with the symptom that creating the Admin user in NoteDb failed with a LOCK_FAILURE. Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Change-Id: I7ffd972581f815c144f810481103c7985af5feb0
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@ -180,6 +180,17 @@ public void testFileSizeChanged() throws Exception {
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assertTrue(save.wasSizeChanged());
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}
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@Test
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public void fileSnapshotEquals() throws Exception {
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// 0 sized FileSnapshot.
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FileSnapshot fs1 = FileSnapshot.MISSING_FILE;
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// UNKNOWN_SIZE FileSnapshot.
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FileSnapshot fs2 = FileSnapshot.save(fs1.lastModified());
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assertTrue(fs1.equals(fs2));
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assertTrue(fs2.equals(fs1));
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}
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private File createFile(String string) throws IOException {
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trash.mkdirs();
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File f = File.createTempFile(string, "tdat", trash);
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@ -144,7 +144,7 @@ private static Object getFileKey(BasicFileAttributes fileAttributes) {
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*/
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public static FileSnapshot save(long modified) {
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final long read = System.currentTimeMillis();
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return new FileSnapshot(read, modified, -1, Duration.ZERO,
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return new FileSnapshot(read, modified, UNKNOWN_SIZE, Duration.ZERO,
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MISSING_FILEKEY);
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}
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@ -318,7 +318,8 @@ public void waitUntilNotRacy() throws InterruptedException {
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* @return true if the two snapshots share the same information.
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*/
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public boolean equals(FileSnapshot other) {
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return lastModified == other.lastModified && size == other.size
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boolean sizeEq = size == UNKNOWN_SIZE || other.size == UNKNOWN_SIZE || size == other.size;
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return lastModified == other.lastModified && sizeEq
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&& Objects.equals(fileKey, other.fileKey);
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}
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