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19 package org.apache.maven.execution.scope.internal;
20
21 import java.util.Collection;
22 import java.util.HashMap;
23 import java.util.IdentityHashMap;
24 import java.util.LinkedList;
25 import java.util.Map;
26
27 import com.google.inject.Key;
28 import com.google.inject.OutOfScopeException;
29 import com.google.inject.Provider;
30 import com.google.inject.Scope;
31 import com.google.inject.util.Providers;
32 import org.apache.maven.execution.MojoExecutionEvent;
33 import org.apache.maven.execution.MojoExecutionListener;
34 import org.apache.maven.execution.scope.WeakMojoExecutionListener;
35 import org.apache.maven.plugin.MojoExecutionException;
36
37
38
39
40 public class MojoExecutionScope implements Scope, MojoExecutionListener {
41 private static final Provider<Object> SEEDED_KEY_PROVIDER = () -> {
42 throw new IllegalStateException();
43 };
44
45 private static final class ScopeState {
46 private final Map<Key<?>, Provider<?>> seeded = new HashMap<>();
47
48 private final Map<Key<?>, Object> provided = new HashMap<>();
49 }
50
51 private final ThreadLocal<LinkedList<ScopeState>> values = new ThreadLocal<>();
52
53 public MojoExecutionScope() {}
54
55 public void enter() {
56 LinkedList<ScopeState> stack = values.get();
57 if (stack == null) {
58 stack = new LinkedList<>();
59 values.set(stack);
60 }
61 stack.addFirst(new ScopeState());
62 }
63
64 private ScopeState getScopeState() {
65 LinkedList<ScopeState> stack = values.get();
66 if (stack == null || stack.isEmpty()) {
67 throw new IllegalStateException();
68 }
69 return stack.getFirst();
70 }
71
72 public void exit() throws MojoExecutionException {
73 final LinkedList<ScopeState> stack = values.get();
74 if (stack == null || stack.isEmpty()) {
75 throw new IllegalStateException();
76 }
77 stack.removeFirst();
78 if (stack.isEmpty()) {
79 values.remove();
80 }
81 }
82
83 public <T> void seed(Class<T> clazz, Provider<T> value) {
84 getScopeState().seeded.put(Key.get(clazz), value);
85 }
86
87 public <T> void seed(Class<T> clazz, final T value) {
88 getScopeState().seeded.put(Key.get(clazz), Providers.of(value));
89 }
90
91 public <T> Provider<T> scope(final Key<T> key, final Provider<T> unscoped) {
92 return () -> {
93 LinkedList<ScopeState> stack = values.get();
94 if (stack == null || stack.isEmpty()) {
95 throw new OutOfScopeException("Cannot access " + key + " outside of a scoping block");
96 }
97
98 ScopeState state = stack.getFirst();
99
100 Provider<?> seeded = state.seeded.get(key);
101
102 if (seeded != null) {
103 return (T) seeded.get();
104 }
105
106 T provided = (T) state.provided.get(key);
107 if (provided == null && unscoped != null) {
108 provided = unscoped.get();
109 state.provided.put(key, provided);
110 }
111
112 return provided;
113 };
114 }
115
116 @SuppressWarnings({"unchecked"})
117 public static <T> Provider<T> seededKeyProvider() {
118 return (Provider<T>) SEEDED_KEY_PROVIDER;
119 }
120
121 public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
122 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
123 provided.beforeMojoExecution(event);
124 }
125 }
126
127 public void afterMojoExecutionSuccess(MojoExecutionEvent event) throws MojoExecutionException {
128 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
129 provided.afterMojoExecutionSuccess(event);
130 }
131 }
132
133 public void afterExecutionFailure(MojoExecutionEvent event) {
134 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
135 provided.afterExecutionFailure(event);
136 }
137 }
138
139 private Collection<WeakMojoExecutionListener> getProvidedListeners() {
140
141
142 IdentityHashMap<WeakMojoExecutionListener, Object> listeners = new IdentityHashMap<>();
143 for (Object provided : getScopeState().provided.values()) {
144 if (provided instanceof WeakMojoExecutionListener) {
145 listeners.put((WeakMojoExecutionListener) provided, null);
146 }
147 }
148 return listeners.keySet();
149 }
150 }