Make CacheBuilder Duration overloads available in guava-android.

Also, related minor changes:
- Import `java.time.Duration` instead of using it fully qualified. (Somehow, existing unqualified usages of `Duration` in _Javadoc_ references were working even without the import.) Compare cl/641315337.
- "Upstream" a fix to a Javadoc reference to `maximumSize` from the Android flavor to the mainline.

Fixes #7232
Progress on #6567

RELNOTES=`cache`: Added `CacheBuilder` `Duration` overloads to `guava-android`.
PiperOrigin-RevId: 642709673

android/guava-tests/test/com/google/common/cache/CacheBuilderTest.java

@@ -36,6 +36,7 @@
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.common.testing.NullPointerTester;
+import java.time.Duration;
 import java.util.Map;
 import java.util.Random;
 import java.util.Set;
@@ -228,6 +229,18 @@ public void testValueStrengthSetTwice() {
     assertThrows(IllegalStateException.class, () -> builder2.weakValues());
   }
 
+  @GwtIncompatible // Duration
+  @SuppressWarnings("Java7ApiChecker")
+  @IgnoreJRERequirement // No more dangerous than wherever the caller got the Duration from
+  public void testLargeDurationsAreOk() {
+    Duration threeHundredYears = Duration.ofDays(365 * 300);
+    CacheBuilder<Object, Object> builder =
+        CacheBuilder.newBuilder()
+            .expireAfterWrite(threeHundredYears)
+            .expireAfterAccess(threeHundredYears)
+            .refreshAfterWrite(threeHundredYears);
+  }
+
   public void testTimeToLive_negative() {
     CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
     try {
@@ -237,6 +250,14 @@ public void testTimeToLive_negative() {
     }
   }
 
+  @GwtIncompatible // Duration
+  @SuppressWarnings("Java7ApiChecker")
+  public void testTimeToLive_negative_duration() {
+    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
+    assertThrows(
+        IllegalArgumentException.class, () -> builder.expireAfterWrite(Duration.ofSeconds(-1)));
+  }
+
   @SuppressWarnings("ReturnValueIgnored")
   public void testTimeToLive_small() {
     CacheBuilder.newBuilder().expireAfterWrite(1, NANOSECONDS).build(identityLoader());
@@ -254,6 +275,14 @@ public void testTimeToLive_setTwice() {
     }
   }
 
+  @GwtIncompatible // Duration
+  @SuppressWarnings("Java7ApiChecker")
+  public void testTimeToLive_setTwice_duration() {
+    CacheBuilder<Object, Object> builder =
+        CacheBuilder.newBuilder().expireAfterWrite(Duration.ofHours(1));
+    assertThrows(IllegalStateException.class, () -> builder.expireAfterWrite(Duration.ofHours(1)));
+  }
+
   public void testTimeToIdle_negative() {
     CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
     try {
@@ -263,6 +292,14 @@ public void testTimeToIdle_negative() {
     }
   }
 
+  @GwtIncompatible // Duration
+  @SuppressWarnings("Java7ApiChecker")
+  public void testTimeToIdle_negative_duration() {
+    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
+    assertThrows(
+        IllegalArgumentException.class, () -> builder.expireAfterAccess(Duration.ofSeconds(-1)));
+  }
+
   @SuppressWarnings("ReturnValueIgnored")
   public void testTimeToIdle_small() {
     CacheBuilder.newBuilder().expireAfterAccess(1, NANOSECONDS).build(identityLoader());
@@ -280,12 +317,21 @@ public void testTimeToIdle_setTwice() {
     }
   }
 
-  @SuppressWarnings("ReturnValueIgnored")
+  @GwtIncompatible // Duration
+  @SuppressWarnings("Java7ApiChecker")
+  public void testTimeToIdle_setTwice_duration() {
+    CacheBuilder<Object, Object> builder =
+        CacheBuilder.newBuilder().expireAfterAccess(Duration.ofHours(1));
+    assertThrows(IllegalStateException.class, () -> builder.expireAfterAccess(Duration.ofHours(1)));
+  }
+
+  @SuppressWarnings("Java7ApiChecker")
   public void testTimeToIdleAndToLive() {
-    CacheBuilder.newBuilder()
-        .expireAfterWrite(1, NANOSECONDS)
-        .expireAfterAccess(1, NANOSECONDS)
-        .build(identityLoader());
+    LoadingCache<?, ?> unused =
+        CacheBuilder.newBuilder()
+            .expireAfterWrite(1, NANOSECONDS)
+            .expireAfterAccess(1, NANOSECONDS)
+            .build(identityLoader());
     // well, it didn't blow up.
   }
 
@@ -295,13 +341,28 @@ public void testRefresh_zero() {
     assertThrows(IllegalArgumentException.class, () -> builder.refreshAfterWrite(0, SECONDS));
   }
 
+  @GwtIncompatible // Duration
+  @SuppressWarnings("Java7ApiChecker")
+  public void testRefresh_zero_duration() {
+    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
+    assertThrows(IllegalArgumentException.class, () -> builder.refreshAfterWrite(Duration.ZERO));
+  }
+
   @GwtIncompatible // refreshAfterWrite
   public void testRefresh_setTwice() {
     CacheBuilder<Object, Object> builder =
         CacheBuilder.newBuilder().refreshAfterWrite(3600, SECONDS);
     assertThrows(IllegalStateException.class, () -> builder.refreshAfterWrite(3600, SECONDS));
   }
 
+  @GwtIncompatible // Duration
+  @SuppressWarnings("Java7ApiChecker")
+  public void testRefresh_setTwice_duration() {
+    CacheBuilder<Object, Object> builder =
+        CacheBuilder.newBuilder().refreshAfterWrite(Duration.ofHours(1));
+    assertThrows(IllegalStateException.class, () -> builder.refreshAfterWrite(Duration.ofHours(1)));
+  }
+
   public void testTicker_setTwice() {
     Ticker testTicker = Ticker.systemTicker();
     CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder().ticker(testTicker);

android/guava/src/com/google/common/cache/CacheBuilder.java

@@ -30,8 +30,10 @@
 import com.google.common.cache.AbstractCache.StatsCounter;
 import com.google.common.cache.LocalCache.Strength;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
+import com.google.j2objc.annotations.J2ObjCIncompatible;
 import java.lang.ref.SoftReference;
 import java.lang.ref.WeakReference;
+import java.time.Duration;
 import java.util.ConcurrentModificationException;
 import java.util.IdentityHashMap;
 import java.util.Map;
@@ -104,7 +106,7 @@
  * <pre>{@code
  * LoadingCache<Key, Graph> graphs = CacheBuilder.newBuilder()
  *     .maximumSize(10000)
- *     .expireAfterWrite(10, TimeUnit.MINUTES)
+ *     .expireAfterWrite(Duration.ofMinutes(10))
  *     .removalListener(MY_LISTENER)
  *     .build(
  *         new CacheLoader<Key, Graph>() {
@@ -194,10 +196,10 @@ public final class CacheBuilder<K, V> {
   private static final int DEFAULT_INITIAL_CAPACITY = 16;
   private static final int DEFAULT_CONCURRENCY_LEVEL = 4;
 
-  @SuppressWarnings("GoodTime") // should be a java.time.Duration
+  @SuppressWarnings("GoodTime") // should be a Duration
   private static final int DEFAULT_EXPIRATION_NANOS = 0;
 
-  @SuppressWarnings("GoodTime") // should be a java.time.Duration
+  @SuppressWarnings("GoodTime") // should be a Duration
   private static final int DEFAULT_REFRESH_NANOS = 0;
 
   static final Supplier<? extends StatsCounter> NULL_STATS_COUNTER =
@@ -289,13 +291,13 @@ private static final class LoggerHolder {
   @CheckForNull Strength keyStrength;
   @CheckForNull Strength valueStrength;
 
-  @SuppressWarnings("GoodTime") // should be a java.time.Duration
+  @SuppressWarnings("GoodTime") // should be a Duration
   long expireAfterWriteNanos = UNSET_INT;
 
-  @SuppressWarnings("GoodTime") // should be a java.time.Duration
+  @SuppressWarnings("GoodTime") // should be a Duration
   long expireAfterAccessNanos = UNSET_INT;
 
-  @SuppressWarnings("GoodTime") // should be a java.time.Duration
+  @SuppressWarnings("GoodTime") // should be a Duration
   long refreshNanos = UNSET_INT;
 
   @CheckForNull Equivalence<Object> keyEquivalence;
@@ -711,12 +713,48 @@ Strength getValueStrength() {
    *
    * @param duration the length of time after an entry is created that it should be automatically
    *     removed
+   * @return this {@code CacheBuilder} instance (for chaining)
+   * @throws IllegalArgumentException if {@code duration} is negative
+   * @throws IllegalStateException if {@link #expireAfterWrite} was already set
+   * @throws ArithmeticException for durations greater than +/- approximately 292 years
+   * @since NEXT (but since 25.0 in the JRE <a
+   *     href="https://github.com/google/guava#guava-google-core-libraries-for-java">flavor</a>)
+   */
+  @J2ObjCIncompatible
+  @GwtIncompatible // Duration
+  @SuppressWarnings({
+    "GoodTime", // Duration decomposition
+    "Java7ApiChecker",
+  })
+  @IgnoreJRERequirement // No more dangerous than wherever the caller got the Duration from
+  @CanIgnoreReturnValue
+  public CacheBuilder<K, V> expireAfterWrite(Duration duration) {
+    return expireAfterWrite(toNanosSaturated(duration), TimeUnit.NANOSECONDS);
+  }
+
+  /**
+   * Specifies that each entry should be automatically removed from the cache once a fixed duration
+   * has elapsed after the entry's creation, or the most recent replacement of its value.
+   *
+   * <p>When {@code duration} is zero, this method hands off to {@link #maximumSize(long)
+   * maximumSize}{@code (0)}, ignoring any otherwise-specified maximum size or weight. This can be
+   * useful in testing, or to disable caching temporarily without a code change.
+   *
+   * <p>Expired entries may be counted in {@link Cache#size}, but will never be visible to read or
+   * write operations. Expired entries are cleaned up as part of the routine maintenance described
+   * in the class javadoc.
+   *
+   * <p>If you can represent the duration as a {@link Duration} (which should be preferred when
+   * feasible), use {@link #expireAfterWrite(Duration)} instead.
+   *
+   * @param duration the length of time after an entry is created that it should be automatically
+   *     removed
    * @param unit the unit that {@code duration} is expressed in
    * @return this {@code CacheBuilder} instance (for chaining)
    * @throws IllegalArgumentException if {@code duration} is negative
    * @throws IllegalStateException if {@link #expireAfterWrite} was already set
    */
-  @SuppressWarnings("GoodTime") // should accept a java.time.Duration
+  @SuppressWarnings("GoodTime") // should accept a Duration
   @CanIgnoreReturnValue
   public CacheBuilder<K, V> expireAfterWrite(long duration, TimeUnit unit) {
     checkState(
@@ -733,6 +771,44 @@ long getExpireAfterWriteNanos() {
     return (expireAfterWriteNanos == UNSET_INT) ? DEFAULT_EXPIRATION_NANOS : expireAfterWriteNanos;
   }
 
+  /**
+   * Specifies that each entry should be automatically removed from the cache once a fixed duration
+   * has elapsed after the entry's creation, the most recent replacement of its value, or its last
+   * access. Access time is reset by all cache read and write operations (including {@code
+   * Cache.asMap().get(Object)} and {@code Cache.asMap().put(K, V)}), but not by {@code
+   * containsKey(Object)}, nor by operations on the collection-views of {@link Cache#asMap}}. So,
+   * for example, iterating through {@code Cache.asMap().entrySet()} does not reset access time for
+   * the entries you retrieve.
+   *
+   * <p>When {@code duration} is zero, this method hands off to {@link #maximumSize(long)
+   * maximumSize}{@code (0)}, ignoring any otherwise-specified maximum size or weight. This can be
+   * useful in testing, or to disable caching temporarily without a code change.
+   *
+   * <p>Expired entries may be counted in {@link Cache#size}, but will never be visible to read or
+   * write operations. Expired entries are cleaned up as part of the routine maintenance described
+   * in the class javadoc.
+   *
+   * @param duration the length of time after an entry is last accessed that it should be
+   *     automatically removed
+   * @return this {@code CacheBuilder} instance (for chaining)
+   * @throws IllegalArgumentException if {@code duration} is negative
+   * @throws IllegalStateException if {@link #expireAfterAccess} was already set
+   * @throws ArithmeticException for durations greater than +/- approximately 292 years
+   * @since NEXT (but since 25.0 in the JRE <a
+   *     href="https://github.com/google/guava#guava-google-core-libraries-for-java">flavor</a>)
+   */
+  @J2ObjCIncompatible
+  @GwtIncompatible // Duration
+  @SuppressWarnings({
+    "GoodTime", // Duration decomposition
+    "Java7ApiChecker",
+  })
+  @IgnoreJRERequirement // No more dangerous than wherever the caller got the Duration from
+  @CanIgnoreReturnValue
+  public CacheBuilder<K, V> expireAfterAccess(Duration duration) {
+    return expireAfterAccess(toNanosSaturated(duration), TimeUnit.NANOSECONDS);
+  }
+
   /**
    * Specifies that each entry should be automatically removed from the cache once a fixed duration
    * has elapsed after the entry's creation, the most recent replacement of its value, or its last
@@ -750,14 +826,17 @@ long getExpireAfterWriteNanos() {
    * write operations. Expired entries are cleaned up as part of the routine maintenance described
    * in the class javadoc.
    *
+   * <p>If you can represent the duration as a {@link Duration} (which should be preferred when
+   * feasible), use {@link #expireAfterAccess(Duration)} instead.
+   *
    * @param duration the length of time after an entry is last accessed that it should be
    *     automatically removed
    * @param unit the unit that {@code duration} is expressed in
    * @return this {@code CacheBuilder} instance (for chaining)
    * @throws IllegalArgumentException if {@code duration} is negative
    * @throws IllegalStateException if {@link #expireAfterAccess} was already set
    */
-  @SuppressWarnings("GoodTime") // should accept a java.time.Duration
+  @SuppressWarnings("GoodTime") // should accept a Duration
   @CanIgnoreReturnValue
   public CacheBuilder<K, V> expireAfterAccess(long duration, TimeUnit unit) {
     checkState(
@@ -776,6 +855,46 @@ long getExpireAfterAccessNanos() {
         : expireAfterAccessNanos;
   }
 
+  /**
+   * Specifies that active entries are eligible for automatic refresh once a fixed duration has
+   * elapsed after the entry's creation, or the most recent replacement of its value. The semantics
+   * of refreshes are specified in {@link LoadingCache#refresh}, and are performed by calling {@link
+   * CacheLoader#reload}.
+   *
+   * <p>As the default implementation of {@link CacheLoader#reload} is synchronous, it is
+   * recommended that users of this method override {@link CacheLoader#reload} with an asynchronous
+   * implementation; otherwise refreshes will be performed during unrelated cache read and write
+   * operations.
+   *
+   * <p>Currently automatic refreshes are performed when the first stale request for an entry
+   * occurs. The request triggering refresh will make a synchronous call to {@link
+   * CacheLoader#reload}
+   * to obtain a future of the new value. If the returned future is already complete, it is returned
+   * immediately. Otherwise, the old value is returned.
+   *
+   * <p><b>Note:</b> <i>all exceptions thrown during refresh will be logged and then swallowed</i>.
+   *
+   * @param duration the length of time after an entry is created that it should be considered
+   *     stale, and thus eligible for refresh
+   * @return this {@code CacheBuilder} instance (for chaining)
+   * @throws IllegalArgumentException if {@code duration} is negative
+   * @throws IllegalStateException if {@link #refreshAfterWrite} was already set
+   * @throws ArithmeticException for durations greater than +/- approximately 292 years
+   * @since NEXT (but since 25.0 in the JRE <a
+   *     href="https://github.com/google/guava#guava-google-core-libraries-for-java">flavor</a>)
+   */
+  @J2ObjCIncompatible
+  @GwtIncompatible // Duration
+  @SuppressWarnings({
+    "GoodTime", // Duration decomposition
+    "Java7ApiChecker",
+  })
+  @IgnoreJRERequirement // No more dangerous than wherever the caller got the Duration from
+  @CanIgnoreReturnValue
+  public CacheBuilder<K, V> refreshAfterWrite(Duration duration) {
+    return refreshAfterWrite(toNanosSaturated(duration), TimeUnit.NANOSECONDS);
+  }
+
   /**
    * Specifies that active entries are eligible for automatic refresh once a fixed duration has
    * elapsed after the entry's creation, or the most recent replacement of its value. The semantics
@@ -795,6 +914,9 @@ long getExpireAfterAccessNanos() {
    *
    * <p><b>Note:</b> <i>all exceptions thrown during refresh will be logged and then swallowed</i>.
    *
+   * <p>If you can represent the duration as a {@link Duration} (which should be preferred when
+   * feasible), use {@link #refreshAfterWrite(Duration)} instead.
+   *
    * @param duration the length of time after an entry is created that it should be considered
    *     stale, and thus eligible for refresh
    * @param unit the unit that {@code duration} is expressed in
@@ -804,7 +926,7 @@ long getExpireAfterAccessNanos() {
    * @since 11.0
    */
   @GwtIncompatible // To be supported (synchronously).
-  @SuppressWarnings("GoodTime") // should accept a java.time.Duration
+  @SuppressWarnings("GoodTime") // should accept a Duration
   @CanIgnoreReturnValue
   public CacheBuilder<K, V> refreshAfterWrite(long duration, TimeUnit unit) {
     checkNotNull(unit);
@@ -1002,4 +1124,27 @@ public String toString() {
     }
     return s.toString();
   }
+
+  /**
+   * Returns the number of nanoseconds of the given duration without throwing or overflowing.
+   *
+   * <p>Instead of throwing {@link ArithmeticException}, this method silently saturates to either
+   * {@link Long#MAX_VALUE} or {@link Long#MIN_VALUE}. This behavior can be useful when decomposing
+   * a duration in order to call a legacy API which requires a {@code long, TimeUnit} pair.
+   */
+  @GwtIncompatible // Duration
+  @SuppressWarnings({
+    "GoodTime", // Duration decomposition
+    "Java7ApiChecker",
+  })
+  @IgnoreJRERequirement // No more dangerous than wherever the caller got the Duration from
+  private static long toNanosSaturated(Duration duration) {
+    // Using a try/catch seems lazy, but the catch block will rarely get invoked (except for
+    // durations longer than approximately +/- 292 years).
+    try {
+      return duration.toNanos();
+    } catch (ArithmeticException tooBig) {
+      return duration.isNegative() ? Long.MIN_VALUE : Long.MAX_VALUE;
+    }
+  }
 }