Method: TxManager.__()

1: /*
2: * *********************************************************************************************************************
3: *
4: * TheseFoolishThings: Miscellaneous utilities
5: * http://tidalwave.it/projects/thesefoolishthings
6: *
7: * Copyright (C) 2009 - 2023 by Tidalwave s.a.s. (http://tidalwave.it)
8: *
9: * *********************************************************************************************************************
10: *
11: * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
12: * the License. You may obtain a copy of the License at
13: *
14: * http://www.apache.org/licenses/LICENSE-2.0
15: *
16: * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
17: * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
18: * specific language governing permissions and limitations under the License.
19: *
20: * *********************************************************************************************************************
21: *
22: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
23: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
24: *
25: * *********************************************************************************************************************
26: */
27: package it.tidalwave.thesefoolishthings.examples.jpafinderexample;
28:
29: import javax.annotation.Nonnull;
30: import java.util.function.Consumer;
31: import java.util.function.Function;
32: import javax.persistence.EntityManager;
33: import it.tidalwave.util.LazySupplier;
34: import it.tidalwave.thesefoolishthings.examples.jpafinderexample.impl.TxManagerImpl;
35:
36: /***********************************************************************************************************************
37: *
38: * @author Fabrizio Giudici
39: *
40: **********************************************************************************************************************/
41: public interface TxManager extends AutoCloseable
42: {
43: static class __ // TODO: Turn to interface constant with Java 11
44: {
45: static final LazySupplier<TxManager> TXMANAGER_REF = LazySupplier.of(TxManagerImpl::new);
46: }
47:
48: @Nonnull
49: public static TxManager getInstance()
50: {
51: return __.TXMANAGER_REF.get();
52: }
53:
54: // START SNIPPET: methods
55: public <T> T computeInTx (@Nonnull Function<EntityManager, T> task);
56:
57: public default void runInTx (@Nonnull final Consumer<EntityManager> task)
58: // END SNIPPET: methods
59: {
60: computeInTx(em ->
61: {
62: task.accept(em);
63: return null;
64: });
65: }
66:
67: public default void close()
68: throws Exception
69: {
70: }
71: }