add class GuavaClassTest
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DOHA
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package org.baeldung.guava;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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import org.junit.Test;
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import com.google.common.base.Optional;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import com.google.common.cache.RemovalCause;
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import com.google.common.cache.RemovalListener;
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import com.google.common.cache.RemovalNotification;
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import com.google.common.cache.Weigher;
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public class GuavaCacheTest {
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@Test
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public void whenCacheMiss_thenAutoLoad() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().build(loader);
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assertEquals(0, cache.size());
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assertEquals("HELLO", cache.getUnchecked("hello"));
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assertEquals(1, cache.size());
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}
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@Test
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public void whenCacheReachMaxSize_thenEviction() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().maximumSize(3).build(loader);
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assertEquals(0, cache.size());
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cache.getUnchecked("first");
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cache.getUnchecked("second");
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cache.getUnchecked("third");
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cache.getUnchecked("forth");
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assertEquals(3, cache.size());
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}
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@Test
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public void whenCacheReachMaxWeight_thenEviction() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final Weigher<String, String> weighByLength = new Weigher<String, String>() {
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@Override
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public int weigh(final String key, final String value) {
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return value.length();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().maximumWeight(16).weigher(weighByLength).build(loader);
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assertEquals(0, cache.size());
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cache.getUnchecked("first");
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cache.getUnchecked("second");
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cache.getUnchecked("third");
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cache.getUnchecked("last");
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assertEquals(3, cache.size());
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}
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@Test
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public void whenEntryIdle_thenEviction() throws InterruptedException {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().expireAfterAccess(2, TimeUnit.MILLISECONDS).build(loader);
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cache.getUnchecked("hello");
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assertEquals(1, cache.size());
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cache.getUnchecked("hello");
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Thread.sleep(300);
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cache.getUnchecked("test");
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assertEquals(1, cache.size());
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}
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@Test
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public void whenEntryLiveTimeExpire_thenEviction() throws InterruptedException {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().expireAfterWrite(2, TimeUnit.MILLISECONDS).build(loader);
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cache.getUnchecked("hello");
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assertEquals(1, cache.size());
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Thread.sleep(300);
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cache.getUnchecked("test");
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assertEquals(1, cache.size());
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}
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@Test
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public void whenWeekKeyHasNoRef_thenRemoveFromCache() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().weakKeys().build(loader);
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assertEquals(0, cache.size());
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}
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@Test
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public void whenSoftValue_thenRemoveFromCache() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().softValues().build(loader);
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assertEquals(0, cache.size());
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}
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@Test
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public void whenNullValue_thenOptional() {
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final CacheLoader<String, Optional<String>> loader = new CacheLoader<String, Optional<String>>() {
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@Override
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public Optional<String> load(final String key) {
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return Optional.fromNullable(getSuffix(key));
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}
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};
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final LoadingCache<String, Optional<String>> cache = CacheBuilder.newBuilder().build(loader);
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assertEquals("txt", cache.getUnchecked("text.txt").get());
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assertFalse(cache.getUnchecked("hello").isPresent());
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}
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@Test
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public void whenLiveTimeEnd_thenRefresh() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().refreshAfterWrite(1, TimeUnit.MINUTES).build(loader);
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assertEquals(0, cache.size());
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}
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@Test
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public void whenPreloadCache_thenUsePutAll() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().build(loader);
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assertEquals(0, cache.size());
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final Map<String, String> map = new HashMap<String, String>();
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map.put("first", "FIRST");
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map.put("second", "SECOND");
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cache.putAll(map);
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assertEquals(2, cache.size());
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}
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@Test
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public void whenEntryRemovedFromCache_thenNotify() {
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final CacheLoader<String, String> loader = new CacheLoader<String, String>() {
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@Override
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public String load(final String key) {
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return key.toUpperCase();
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}
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};
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final RemovalListener<String, String> listener = new RemovalListener<String, String>() {
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@Override
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public void onRemoval(final RemovalNotification<String, String> n) {
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if (n.wasEvicted()) {
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final String cause = n.getCause().name();
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assertEquals(RemovalCause.SIZE.toString(), cause);
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}
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}
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};
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final LoadingCache<String, String> cache = CacheBuilder.newBuilder().maximumSize(3).removalListener(listener).build(loader);
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cache.getUnchecked("first");
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cache.getUnchecked("second");
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cache.getUnchecked("third");
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cache.getUnchecked("last");
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assertEquals(3, cache.size());
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}
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private String getSuffix(final String str) {
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final int lastIndex = str.lastIndexOf('.');
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if (lastIndex == -1)
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return null;
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return str.substring(lastIndex + 1);
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}
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}
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