1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.maven.api.cli.logging;
20
21 import java.util.List;
22 import java.util.concurrent.CopyOnWriteArrayList;
23 import java.util.concurrent.atomic.AtomicReference;
24
25 import org.apache.maven.api.cli.Logger;
26
27 import static java.util.Objects.requireNonNull;
28
29 /**
30 * Early CLI {@link Logger} that simply accumulates log entries until some point a real logger can emit them. This
31 * logger is created at start, and it exists while no logging is available yet.
32 */
33 public class AccumulatingLogger implements Logger {
34 private final AtomicReference<List<Entry>> entries = new AtomicReference<>(new CopyOnWriteArrayList<>());
35
36 @Override
37 public void log(Level level, String message, Throwable error) {
38 requireNonNull(level, "level");
39 requireNonNull(message, "message");
40 entries.get().add(new Entry(level, message, error));
41 }
42
43 @Override
44 public List<Entry> drain() {
45 return entries.getAndSet(new CopyOnWriteArrayList<>());
46 }
47 }