本文整理了Java中javax.cache.Cache.replace()方法的一些代码示例，展示了Cache.replace()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Cache.replace()方法的具体详情如下：
包路径：javax.cache.Cache
类名称：Cache
方法名：replace

Cache.replace介绍

[英]Atomically replaces the entry for a key only if currently mapped to some value.

This is equivalent to

if (cache.containsKey(key)) { 
cache.put(key, value); 
return true; 
} else { 
return false; 
}

except that the action is performed atomically.
[中]仅当当前映射到某个值时，才会自动替换键的条目。
这相当于

if (cache.containsKey(key)) { 
cache.put(key, value); 
return true; 
} else { 
return false; 
}

除了操作是以原子方式执行之外。

代码示例

代码示例来源：origin: killbill/killbill

@Override
public V put(final K key, final V value) throws CacheException {
  V previousValue;
  while (true) {
    previousValue = cache.get(key);
    if (previousValue == null) {
      if (cache.putIfAbsent(key, value)) {
        break;
      }
    } else {
      if (cache.replace(key, value)) {
        break;
      }
    }
  }
  return previousValue;
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testSimpleReplace3ArgsWithLoaderAndWriter_absent() throws Exception {
 when(cacheLoader.load(eq(1))).thenAnswer(invocation -> null);
 assertThat(testCache.containsKey(1), is(false));
 assertThat(testCache.replace(1, "un", "one"), is(false));
 verifyZeroInteractions(cacheLoader);
 verifyZeroInteractions(cacheWriter);
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testSimpleReplace2ArgsWithLoaderAndWriter_absent() throws Exception {
 when(cacheLoader.load(eq(1))).thenAnswer(invocation -> null);
 assertThat(testCache.containsKey(1), is(false));
 assertThat(testCache.replace(1, "one"), is(false));
 assertThat(testCache.containsKey(1), is(false));
 verifyZeroInteractions(cacheLoader);
 verifyZeroInteractions(cacheWriter);
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testSimpleReplace2ArgsWithLoaderAndWriter_existsInSor() throws Exception {
 when(cacheLoader.load(eq(1))).thenAnswer(invocation -> "un");
 assertThat(testCache.containsKey(1), is(false));
 assertThat(testCache.replace(1, "one"), is(false));
 assertThat(testCache.containsKey(1), is(false));
 verifyZeroInteractions(cacheLoader);
 verifyZeroInteractions(cacheWriter);
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testSimpleReplace3ArgsWithLoaderAndWriter_existsInSor() throws Exception {
 when(cacheLoader.load(eq(1))).thenAnswer(invocation -> "un");
 assertThat(testCache.containsKey(1), is(false));
 assertThat(testCache.replace(1, "un", "one"), is(false));
 assertThat(testCache.containsKey(1), is(false));
 verifyZeroInteractions(cacheLoader);
 verifyZeroInteractions(cacheWriter);
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void replaceKON() {
 expect(cache.replace(1, "a", "b")).isFalse();
 changesOf(0, 1, 0, 0);
 cache.put(1, "a");
 changesOf(0, 0, 1, 0);
 expect(cache.replace(1, "xxx", "b")).isFalse();
 changesOf(1, 0, 0, 0);
 expect(cache.replace(1, "a", "b")).isTrue();
 changesOf(1, 0, 1, 0);
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testSimpleReplace3ArgsWithLoaderAndWriter_existsInStore_notEquals() throws Exception {
 testCache.put(1, "un");
 reset(cacheWriter);
 assertThat(testCache.replace(1, "uno", "one"), is(false));
 assertThat(testCache.get(1), Matchers.<CharSequence>equalTo("un"));
 verifyZeroInteractions(cacheLoader);
 verifyZeroInteractions(cacheWriter);
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void replaceKV() {
 expect(cache.replace(1, "a")).isFalse();
 changesOf(0, 1, 0, 0);
 cache.put(1, "a");
 changesOf(0, 0, 1, 0);
 expect(cache.replace(1, "b")).isTrue();
 changesOf(1, 0, 1, 0);
}

代码示例来源：origin: apache/ignite

/**
 * Tries to set the global cleanup node id to current node.
 *
 * @param grid Grid.
 * @param metaCache Meta cache.
 *
 * @return True if successfully set the flag indicating that current node performs the cleanup; otherwise false.
 */
private boolean trySetGlobalCleanupFlag(Ignite grid, final Cache<CleanupNodeId, UUID> metaCache) {
  final UUID localNodeId = grid.cluster().localNode().id();
  while (true) {
    // Get the node performing cleanup.
    UUID nodeId = metaCache.get(CLEANUP_NODE_ID);
    if (nodeId == null) {
      if (metaCache.putIfAbsent(CLEANUP_NODE_ID, localNodeId))
        return true;  // Successfully reserved cleanup to local node.
      // Failed putIfAbsent: someone else may have started cleanup. Retry the check.
      continue;
    }
    if (nodeId.equals(localNodeId))
      return false;  // Current node already performs cleanup.
    if (grid.cluster().node(nodeId) != null)
      return false;  // Another node already performs cleanup and is alive.
    // Node that performs cleanup has disconnected.
    if (metaCache.replace(CLEANUP_NODE_ID, nodeId, localNodeId))
      return true;  // Successfully replaced disconnected node id with our id.
    // Replace failed: someone else started cleanup.
    return false;
  }
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testSimpleReplace3ArgsWithLoaderAndWriter_existsInStore() throws Exception {
 testCache.put(1, "un");
 reset(cacheWriter);
 assertThat(testCache.replace(1, "un", "one"), is(true));
 assertThat(testCache.get(1), Matchers.<CharSequence>equalTo("one"));
 verifyZeroInteractions(cacheLoader);
 verify(cacheWriter, times(1)).write(new Eh107CacheLoaderWriter.Entry<Number, CharSequence>(1, "one"));
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testSimpleReplace2ArgsWithLoaderAndWriter_existsInStore() throws Exception {
 testCache.put(1, "un");
 reset(cacheWriter);
 assertThat(testCache.replace(1, "one"), is(true));
 assertThat(testCache.get(1), Matchers.<CharSequence>equalTo("one"));
 verifyZeroInteractions(cacheLoader);
 verify(cacheWriter, times(1)).write(new Eh107CacheLoaderWriter.Entry<Number, CharSequence>(1, "one"));
}

代码示例来源：origin: apache/cxf

@Override
protected void linkRefreshTokenToAccessToken(RefreshToken rt, ServerAccessToken at) {
  super.linkRefreshTokenToAccessToken(rt,  at);
  if (!isStoreJwtTokenKeyOnly()) {
    accessTokenCache.replace(at.getTokenKey(), at);
  }
}

代码示例来源：origin: cache2k/cache2k

@Override
public boolean replace(K key, V oldValue, V newValue) {
 return cache.replace(
   passingKeyTransformer.compact(key),
   passingValueTransformer.compact(oldValue),
   valueTransformer.compact(newValue));
}

代码示例来源：origin: javax.cache/cache-tests

@Test
public void replace_3arg() throws Exception {
 long now = System.currentTimeMillis();
 Date key = new Date(now);
 Date value = new Date(now);
 cache.put(key, value);
 Date nextValue = new Date(now + 1);
 assertTrue(cache.replace(key, value, nextValue));
 assertSame(nextValue, cache.get(key));
}

代码示例来源：origin: javax.cache/cache-tests

@Test
public void replace_3arg_NullKey() {
 try {
  assertFalse(cache.replace(null, "1", "2"));
  fail("should have thrown an exception - null key not allowed");
 } catch (NullPointerException e) {
  //good
 }
}

代码示例来源：origin: javax.cache/cache-tests

@Test
public void replace_2arg_NullKey() {
 try {
  assertFalse(cache.replace(null, ""));
  fail("should have thrown an exception - null key not allowed");
 } catch (NullPointerException e) {
  //good
 }
}

代码示例来源：origin: javax.cache/cache-tests

@Test
public void replace_2arg_NullValue() {
 try {
  assertFalse(cache.replace(1L, null));
  fail("should have thrown an exception - null value not allowed");
 } catch (NullPointerException e) {
  //good
 }
}

代码示例来源：origin: javax.cache/cache-tests

@Test
public void replace_3arg_NullValue2() {
 try {
  assertFalse(cache.replace(1L, "1", null));
  fail("should have thrown an exception - null value not allowed");
 } catch (NullPointerException e) {
  //good
 }
}

代码示例来源：origin: javax.cache/cache-tests

@Test
public void replace_3arg() throws Exception {
 Long key = System.currentTimeMillis();
 String value = "value" + key;
 cache.put(key, value);
 String nextValue = "value" + key + 1;
 assertTrue(cache.replace(key, value, nextValue));
 assertEquals(nextValue, cache.get(key));
}

代码示例来源：origin: org.infinispan/infinispan-core

private <K> void doReplace(Supplier<K> keySupplier,
   Cache<K, String> readCache, Cache<K, String> writeCache) {
 K key = keySupplier.get();
 assertEquals(null, readCache.get(key));
 assertFalse(writeCache.replace(key, "xxx"));
 assertEquals(null, writeCache.getAndPut(key, "one"));
 assertEquals("one", readCache.get(key));
 assertTrue(writeCache.replace(key, "uno"));
 assertEquals("uno", readCache.get(key));
 assertTrue(writeCache.remove(key));
 assertEquals(null, readCache.get(key));
}