diff options
Diffstat (limited to 'src/com/vaadin/data/util/sqlcontainer/CacheFlushNotifier.java')
| -rw-r--r-- | src/com/vaadin/data/util/sqlcontainer/CacheFlushNotifier.java | 184 |
1 files changed, 92 insertions, 92 deletions
diff --git a/src/com/vaadin/data/util/sqlcontainer/CacheFlushNotifier.java b/src/com/vaadin/data/util/sqlcontainer/CacheFlushNotifier.java index ac6efaa49b..788966048d 100644 --- a/src/com/vaadin/data/util/sqlcontainer/CacheFlushNotifier.java +++ b/src/com/vaadin/data/util/sqlcontainer/CacheFlushNotifier.java @@ -1,92 +1,92 @@ -/*
-@VaadinApache2LicenseForJavaFiles@
- */
-package com.vaadin.data.util.sqlcontainer;
-
-import java.io.Serializable;
-import java.lang.ref.ReferenceQueue;
-import java.lang.ref.WeakReference;
-import java.util.ArrayList;
-import java.util.List;
-
-import com.vaadin.data.util.sqlcontainer.query.FreeformQuery;
-import com.vaadin.data.util.sqlcontainer.query.QueryDelegate;
-import com.vaadin.data.util.sqlcontainer.query.TableQuery;
-
-/**
- * CacheFlushNotifier is a simple static notification mechanism to inform other
- * SQLContainers that the contents of their caches may have become stale.
- */
-class CacheFlushNotifier implements Serializable {
- /*
- * SQLContainer instance reference list and dead reference queue. Used for
- * the cache flush notification feature.
- */
- private static List<WeakReference<SQLContainer>> allInstances = new ArrayList<WeakReference<SQLContainer>>();
- private static ReferenceQueue<SQLContainer> deadInstances = new ReferenceQueue<SQLContainer>();
-
- /**
- * Adds the given SQLContainer to the cache flush notification receiver list
- *
- * @param c
- * Container to add
- */
- public static void addInstance(SQLContainer c) {
- removeDeadReferences();
- if (c != null) {
- allInstances.add(new WeakReference<SQLContainer>(c, deadInstances));
- }
- }
-
- /**
- * Removes dead references from instance list
- */
- private static void removeDeadReferences() {
- java.lang.ref.Reference<? extends SQLContainer> dead = deadInstances
- .poll();
- while (dead != null) {
- allInstances.remove(dead);
- dead = deadInstances.poll();
- }
- }
-
- /**
- * Iterates through the instances and notifies containers which are
- * connected to the same table or are using the same query string.
- *
- * @param c
- * SQLContainer that issued the cache flush notification
- */
- public static void notifyOfCacheFlush(SQLContainer c) {
- removeDeadReferences();
- for (WeakReference<SQLContainer> wr : allInstances) {
- if (wr.get() != null) {
- SQLContainer wrc = wr.get();
- if (wrc == null) {
- continue;
- }
- /*
- * If the reference points to the container sending the
- * notification, do nothing.
- */
- if (wrc.equals(c)) {
- continue;
- }
- /* Compare QueryDelegate types and tableName/queryString */
- QueryDelegate wrQd = wrc.getQueryDelegate();
- QueryDelegate qd = c.getQueryDelegate();
- if (wrQd instanceof TableQuery
- && qd instanceof TableQuery
- && ((TableQuery) wrQd).getTableName().equals(
- ((TableQuery) qd).getTableName())) {
- wrc.refresh();
- } else if (wrQd instanceof FreeformQuery
- && qd instanceof FreeformQuery
- && ((FreeformQuery) wrQd).getQueryString().equals(
- ((FreeformQuery) qd).getQueryString())) {
- wrc.refresh();
- }
- }
- }
- }
-}
+/* +@VaadinApache2LicenseForJavaFiles@ + */ +package com.vaadin.data.util.sqlcontainer; + +import java.io.Serializable; +import java.lang.ref.ReferenceQueue; +import java.lang.ref.WeakReference; +import java.util.ArrayList; +import java.util.List; + +import com.vaadin.data.util.sqlcontainer.query.FreeformQuery; +import com.vaadin.data.util.sqlcontainer.query.QueryDelegate; +import com.vaadin.data.util.sqlcontainer.query.TableQuery; + +/** + * CacheFlushNotifier is a simple static notification mechanism to inform other + * SQLContainers that the contents of their caches may have become stale. + */ +class CacheFlushNotifier implements Serializable { + /* + * SQLContainer instance reference list and dead reference queue. Used for + * the cache flush notification feature. + */ + private static List<WeakReference<SQLContainer>> allInstances = new ArrayList<WeakReference<SQLContainer>>(); + private static ReferenceQueue<SQLContainer> deadInstances = new ReferenceQueue<SQLContainer>(); + + /** + * Adds the given SQLContainer to the cache flush notification receiver list + * + * @param c + * Container to add + */ + public static void addInstance(SQLContainer c) { + removeDeadReferences(); + if (c != null) { + allInstances.add(new WeakReference<SQLContainer>(c, deadInstances)); + } + } + + /** + * Removes dead references from instance list + */ + private static void removeDeadReferences() { + java.lang.ref.Reference<? extends SQLContainer> dead = deadInstances + .poll(); + while (dead != null) { + allInstances.remove(dead); + dead = deadInstances.poll(); + } + } + + /** + * Iterates through the instances and notifies containers which are + * connected to the same table or are using the same query string. + * + * @param c + * SQLContainer that issued the cache flush notification + */ + public static void notifyOfCacheFlush(SQLContainer c) { + removeDeadReferences(); + for (WeakReference<SQLContainer> wr : allInstances) { + if (wr.get() != null) { + SQLContainer wrc = wr.get(); + if (wrc == null) { + continue; + } + /* + * If the reference points to the container sending the + * notification, do nothing. + */ + if (wrc.equals(c)) { + continue; + } + /* Compare QueryDelegate types and tableName/queryString */ + QueryDelegate wrQd = wrc.getQueryDelegate(); + QueryDelegate qd = c.getQueryDelegate(); + if (wrQd instanceof TableQuery + && qd instanceof TableQuery + && ((TableQuery) wrQd).getTableName().equals( + ((TableQuery) qd).getTableName())) { + wrc.refresh(); + } else if (wrQd instanceof FreeformQuery + && qd instanceof FreeformQuery + && ((FreeformQuery) wrQd).getQueryString().equals( + ((FreeformQuery) qd).getQueryString())) { + wrc.refresh(); + } + } + } + } +} |