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19 package org.apache.maven.execution.scope.internal;
20
21 import com.google.inject.Key;
22 import com.google.inject.OutOfScopeException;
23 import com.google.inject.Provider;
24 import com.google.inject.Scope;
25 import com.google.inject.util.Providers;
26 import java.util.Collection;
27 import java.util.HashMap;
28 import java.util.IdentityHashMap;
29 import java.util.LinkedList;
30 import java.util.Map;
31 import org.apache.maven.execution.MojoExecutionEvent;
32 import org.apache.maven.execution.MojoExecutionListener;
33 import org.apache.maven.execution.scope.WeakMojoExecutionListener;
34 import org.apache.maven.plugin.MojoExecutionException;
35
36
37
38
39 public class MojoExecutionScope implements Scope, MojoExecutionListener {
40 private static final Provider<Object> SEEDED_KEY_PROVIDER = () -> {
41 throw new IllegalStateException();
42 };
43
44 private static final class ScopeState {
45 private final Map<Key<?>, Provider<?>> seeded = new HashMap<>();
46
47 private final Map<Key<?>, Object> provided = new HashMap<>();
48 }
49
50 private final ThreadLocal<LinkedList<ScopeState>> values = new ThreadLocal<>();
51
52 public MojoExecutionScope() {}
53
54 public void enter() {
55 LinkedList<ScopeState> stack = values.get();
56 if (stack == null) {
57 stack = new LinkedList<>();
58 values.set(stack);
59 }
60 stack.addFirst(new ScopeState());
61 }
62
63 private ScopeState getScopeState() {
64 LinkedList<ScopeState> stack = values.get();
65 if (stack == null || stack.isEmpty()) {
66 throw new IllegalStateException();
67 }
68 return stack.getFirst();
69 }
70
71 public void exit() throws MojoExecutionException {
72 final LinkedList<ScopeState> stack = values.get();
73 if (stack == null || stack.isEmpty()) {
74 throw new IllegalStateException();
75 }
76 stack.removeFirst();
77 if (stack.isEmpty()) {
78 values.remove();
79 }
80 }
81
82 public <T> void seed(Class<T> clazz, Provider<T> value) {
83 getScopeState().seeded.put(Key.get(clazz), value);
84 }
85
86 public <T> void seed(Class<T> clazz, final T value) {
87 getScopeState().seeded.put(Key.get(clazz), Providers.of(value));
88 }
89
90 public <T> Provider<T> scope(final Key<T> key, final Provider<T> unscoped) {
91 return () -> {
92 LinkedList<ScopeState> stack = values.get();
93 if (stack == null || stack.isEmpty()) {
94 throw new OutOfScopeException("Cannot access " + key + " outside of a scoping block");
95 }
96
97 ScopeState state = stack.getFirst();
98
99 Provider<?> seeded = state.seeded.get(key);
100
101 if (seeded != null) {
102 return (T) seeded.get();
103 }
104
105 T provided = (T) state.provided.get(key);
106 if (provided == null && unscoped != null) {
107 provided = unscoped.get();
108 state.provided.put(key, provided);
109 }
110
111 return provided;
112 };
113 }
114
115 @SuppressWarnings({"unchecked"})
116 public static <T> Provider<T> seededKeyProvider() {
117 return (Provider<T>) SEEDED_KEY_PROVIDER;
118 }
119
120 public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
121 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
122 provided.beforeMojoExecution(event);
123 }
124 }
125
126 public void afterMojoExecutionSuccess(MojoExecutionEvent event) throws MojoExecutionException {
127 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
128 provided.afterMojoExecutionSuccess(event);
129 }
130 }
131
132 public void afterExecutionFailure(MojoExecutionEvent event) {
133 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
134 provided.afterExecutionFailure(event);
135 }
136 }
137
138 private Collection<WeakMojoExecutionListener> getProvidedListeners() {
139
140
141 IdentityHashMap<WeakMojoExecutionListener, Object> listeners = new IdentityHashMap<>();
142 for (Object provided : getScopeState().provided.values()) {
143 if (provided instanceof WeakMojoExecutionListener) {
144 listeners.put((WeakMojoExecutionListener) provided, null);
145 }
146 }
147 return listeners.keySet();
148 }
149 }