GAEContainer

Vaadin Container for Google App Engine.

GAEContainer enables usage of the App Engine Datastore trough the Vaadin Container interface. The GAEContainer has support for a multi-level cache hierarchy with highly customizable implementations for local memory and distributed Memcache, optimistic locking and manual commits for items, multivalued properties and filtering with a set of different filters.

Sample code

 //set up the cache configs
    static final LocalMemoryCacheConfig localMemoryCacheConfig = new LocalMemoryCacheConfig.Builder()
    .withCacheFilteredIndexes(true)
    .withCacheFilteredSizes(true)
    .withIndexCapacity(50)
    .withIndexLifeTime(60)
    .withItemCapacity(500)
    .withItemLifeTime(60)
    .withLineSize(25)
    .withRemoveStrategy(RemoveStrategy.LRU)
    .withSizeCapacity(10)
    .withSizeLifeTime(60).Build();
    
    static final MemCacheConfig memCacheConfig = new MemCacheConfig.Builder()
    .withCacheFilteredIndexes(true)
    .withIndexLifeTime(500)
    .withItemLifeTime(500)
    .withLineSize(50).Build();
    
    //create the GAEContainer with the caches and property write trough and no optimistic locking
    private GAEContainer addressBookData = new GAEContainer("People", true, false, CacheFactory.getCache(localMemoryCacheConfig), CacheFactory.getCache(memCacheConfig));


...
...

 private String[] initAddressList() {
        contactList.setContainerDataSource(addressBookData);
        contactList.setVisibleColumns(visibleCols);
        contactList.setSelectable(true);
        .....
}

Links

• Source Code
• Discussion Forum
• Online Demo

Compatibility