JarCastingLazy
Utility to postpone initialisation of a value
implementation 'ru.noties:lazy:1.1.0'
final Lazy<String> lazy = Lazy.of(() -> "I'm so lazy!");
final Lazy<Calendar> lazy = Lazy.of(Calendar::getInstance);
final Calendar calendar = lazy.get();
final Lazy<Cursor> lazy = Lazy.ofSynchronized(this::query);
final Lazy<Integer> lazy = Lazy.of(() -> 42);
final Lazy<Integer> sync = Lazy.ofSynchronized(lazy);
Hide
Starting with 1.1.0 Lazy provides a way to hide wrapped type:
final CharSequence cs = Lazy.ofHidden(CharSequence.class, () -> "Yeah, it's me");
// or
final CharSequence cs = Lazy.of(() -> "We are the lazy!").hide(CharSequence.class);
NB This works ONLY for interface types as internally java.lang.reflect.Proxy is used.
With some lifecycle notification (using lifebus):
public class MainActivity extends Activity {
private Lifebus<ActivityEvent> lifebus;
private CharSequence hiddenLazy;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
lifebus = ActivityLifebus.create(this);
hiddenLazy = Lazy.of(() -> "Really resource consuming thing here")
.accept(lazy -> lifebus.on(ActivityEvent.DESTROY, () -> {
if (lazy.hasValue()) {
// release it here
lazy.get();
}
}))
.hide(CharSequence.class);
}
}
Copyright 2018 Dimitry Ivanov (mail@dimitryivanov.ru)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.