#1427 - QueryCache should be cleared, if one of a dependent bean is updated

Initial work, does not include propagation across cluster.

src/main/java/io/ebeaninternal/server/cache/DefaultServerCacheConfig.java

@@ -0,0 +1,80 @@
+package io.ebeaninternal.server.cache;
+
+import io.ebean.cache.QueryCacheEntryValidate;
+import io.ebean.cache.ServerCacheConfig;
+import io.ebean.cache.ServerCacheOptions;
+import io.ebean.config.CurrentTenantProvider;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class DefaultServerCacheConfig {
+
+  private final ServerCacheConfig config;
+
+  private int maxSize;
+  private int maxIdleSecs;
+  private int maxSecsToLive;
+  private int trimFrequency;
+
+  private Map<Object, DefaultServerCache.CacheEntry> map;
+
+  public DefaultServerCacheConfig(ServerCacheConfig config) {
+    this(config,  new ConcurrentHashMap<>());
+  }
+
+  public DefaultServerCacheConfig(ServerCacheConfig config, Map<Object, DefaultServerCache.CacheEntry> map) {
+    this.config = config;
+    this.map = map;
+
+    ServerCacheOptions options = config.getCacheOptions();
+    this.maxIdleSecs = options.getMaxIdleSecs();
+    this.maxSecsToLive = options.getMaxSecsToLive();
+    this.trimFrequency = options.getTrimFrequency();
+    this.maxSize = options.getMaxSize();
+  }
+
+  public CurrentTenantProvider getTenantProvider() {
+    return config.getTenantProvider();
+  }
+
+  public QueryCacheEntryValidate getQueryCacheEntryValidate() {
+    return config.getQueryCacheEntryValidate();
+  }
+
+  public String getName() {
+    return config.getCacheKey();
+  }
+
+  public Map<Object, DefaultServerCache.CacheEntry> getMap() {
+    return map;
+  }
+
+  public int getMaxSize() {
+    return maxSize;
+  }
+
+  public int getMaxIdleSecs() {
+    return maxIdleSecs;
+  }
+
+  public int getMaxSecsToLive() {
+    return maxSecsToLive;
+  }
+
+  /**
+   * Determine a good trimFrequency as half of maxIdleSecs (or maxSecsToLive).
+   */
+  public int determineTrimFrequency() {
+    if (trimFrequency > 0) {
+      return trimFrequency;
+    }
+    if (maxIdleSecs > 0) {
+      return maxIdleSecs / 2 - 1;
+    }
+    if (maxSecsToLive > 0) {
+      return maxSecsToLive / 2 - 1;
+    }
+    return 0;
+  }
+}