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author | Pete Bentley <prb@google.com> | 2021-03-03 13:41:16 +0000 |
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committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | 2021-03-03 13:41:16 +0000 |
commit | c7a6d4ec7defd99aab81c3add6e2916629a79a24 (patch) | |
tree | 9d0ef66d108d76d38341cb002d5a46f74299983f /src/main/java/org/junit/internal/requests/MemoizingRequest.java | |
parent | 91c5e5ff9d71ebc00818b310c09b175016c36dc2 (diff) | |
parent | fcd81b3e3fa66cb13ab508ef8f9a4a8704309350 (diff) | |
download | junit-c7a6d4ec7defd99aab81c3add6e2916629a79a24.tar.gz |
Merge changes I578a2676,I4b37c2d0,Id1e2d638,I1ebe37da,I6135799c am: b6446bec0a am: fcd81b3e3f
Original change: https://android-review.googlesource.com/c/platform/external/junit/+/1613132
MUST ONLY BE SUBMITTED BY AUTOMERGER
Change-Id: Ide8f718358c2b88fb4af0b2b2792f5a560de4d67
Diffstat (limited to 'src/main/java/org/junit/internal/requests/MemoizingRequest.java')
-rw-r--r-- | src/main/java/org/junit/internal/requests/MemoizingRequest.java | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/main/java/org/junit/internal/requests/MemoizingRequest.java b/src/main/java/org/junit/internal/requests/MemoizingRequest.java new file mode 100644 index 0000000..191c230 --- /dev/null +++ b/src/main/java/org/junit/internal/requests/MemoizingRequest.java @@ -0,0 +1,30 @@ +package org.junit.internal.requests; + +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; + +import org.junit.runner.Request; +import org.junit.runner.Runner; + +abstract class MemoizingRequest extends Request { + private final Lock runnerLock = new ReentrantLock(); + private volatile Runner runner; + + @Override + public final Runner getRunner() { + if (runner == null) { + runnerLock.lock(); + try { + if (runner == null) { + runner = createRunner(); + } + } finally { + runnerLock.unlock(); + } + } + return runner; + } + + /** Creates the {@link Runner} to return from {@link #getRunner()}. Called at most once. */ + protected abstract Runner createRunner(); +} |