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POGuava CacheBuilder Cache RemovalListener onRemoval doesn't get called everytime though the entry gets removed
 

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  1. POGuava CacheBuilder Cache RemovalListener onRemoval doesn't get called everytime though the entry gets removed
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    <p>I have created a Guava CacheBuilder based cache with on expiry of 5 seconds if key is not written to. Have added a removalListener to it which prints the key/value pair being removed. What I have observed is that the onRemoval method of the listener gets called only the first time. It doesn't get called the second time an entry is removed. (The actual removal happens. Just the onRemoval method of the removalListener doesn't get called). </p> <p>Am I doing something wrong? Can somebody help? Thanks in advance. Here's my code:</p> <pre><code>import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.TimeUnit; import com.google.common.cache.Cache; import com.google.common.cache.CacheBuilder; import com.google.common.cache.RemovalListener; import com.google.common.cache.RemovalNotification; public class TestCacheBuilder { public static void main(String[] args) { try { new TestCacheBuilder(); }catch (Exception e){ e.printStackTrace(); } } public TestCacheBuilder() { Cache&lt;String, String&gt; myCache = CacheBuilder.newBuilder() .expireAfterWrite(5, TimeUnit.SECONDS) .removalListener(new RemovalListener&lt;String, String&gt;() { public void onRemoval(RemovalNotification&lt;String, String&gt; removal) { System.out.println("removal: "+removal.getKey()+"/"+removal.getValue()); } }) .build(); Map&lt;String, String&gt; inMap = myCache.asMap(); inMap.put("MyKey", "FirstValue"); System.out.println("Initial Insert: "+inMap); //Wait 16 seconds try { Thread.sleep(4000); } catch(InterruptedException ex) { Thread.currentThread().interrupt(); } System.out.println("After 4 seconds: " + inMap); inMap.put("MyKey", "SecondValue"); try { Thread.sleep(1000); } catch(InterruptedException ex) { Thread.currentThread().interrupt(); } System.out.println("After 1 more second: " + inMap); try { Thread.sleep(4000); } catch(InterruptedException ex) { Thread.currentThread().interrupt(); } System.out.println("After 4 more seconds: " + inMap); } } </code></pre> <p>The output is as below:</p> <pre><code>Initial Insert: {MyKey=FirstValue} After 4 seconds: {MyKey=FirstValue} removal: MyKey/FirstValue After 1 more second: {MyKey=SecondValue} After 4 more seconds: {} </code></pre>
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    1. USKiran
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    1. COAlso see http://stackoverflow.com/questions/10626720/guava-cachebuilder-removal-listener
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      1. USFrank Pavageau
    2. COAside from the actual question: you can enhance your tests by using the [Ticker](http://docs.guava-libraries.googlecode.com/git-history/release/javadoc/com/google/common/base/Ticker.html) to simulate a clock that you can manipulate at your will ([see here](http://code.google.com/p/guava-libraries/wiki/CachesExplained#Eviction)). That will speed up your tests and makes them resilient to subtle timing problems.
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      1. USPyranja
    3. COThanks Pyranja. Will definitely check that out !
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