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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 = new Provider<Object>() {
42 public Object get() {
43 throw new IllegalStateException();
44 }
45 };
46
47 private static final class ScopeState {
48 private final Map<Key<?>, Provider<?>> seeded = new HashMap<>();
49
50 private final Map<Key<?>, Object> provided = new HashMap<>();
51 }
52
53 private final ThreadLocal<LinkedList<ScopeState>> values = new ThreadLocal<>();
54
55 public MojoExecutionScope() {}
56
57 public void enter() {
58 LinkedList<ScopeState> stack = values.get();
59 if (stack == null) {
60 stack = new LinkedList<>();
61 values.set(stack);
62 }
63 stack.addFirst(new ScopeState());
64 }
65
66 private ScopeState getScopeState() {
67 LinkedList<ScopeState> stack = values.get();
68 if (stack == null || stack.isEmpty()) {
69 throw new IllegalStateException();
70 }
71 return stack.getFirst();
72 }
73
74 public void exit() throws MojoExecutionException {
75 final LinkedList<ScopeState> stack = values.get();
76 if (stack == null || stack.isEmpty()) {
77 throw new IllegalStateException();
78 }
79 stack.removeFirst();
80 if (stack.isEmpty()) {
81 values.remove();
82 }
83 }
84
85 public <T> void seed(Class<T> clazz, Provider<T> value) {
86 getScopeState().seeded.put(Key.get(clazz), value);
87 }
88
89 public <T> void seed(Class<T> clazz, final T value) {
90 getScopeState().seeded.put(Key.get(clazz), Providers.of(value));
91 }
92
93 public <T> Provider<T> scope(final Key<T> key, final Provider<T> unscoped) {
94 return new Provider<T>() {
95 @SuppressWarnings("unchecked")
96 public T get() {
97 LinkedList<ScopeState> stack = values.get();
98 if (stack == null || stack.isEmpty()) {
99 throw new OutOfScopeException("Cannot access " + key + " outside of a scoping block");
100 }
101
102 ScopeState state = stack.getFirst();
103
104 Provider<?> seeded = state.seeded.get(key);
105
106 if (seeded != null) {
107 return (T) seeded.get();
108 }
109
110 T provided = (T) state.provided.get(key);
111 if (provided == null && unscoped != null) {
112 provided = unscoped.get();
113 state.provided.put(key, provided);
114 }
115
116 return provided;
117 }
118 };
119 }
120
121 @SuppressWarnings({"unchecked"})
122 public static <T> Provider<T> seededKeyProvider() {
123 return (Provider<T>) SEEDED_KEY_PROVIDER;
124 }
125
126 public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
127 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
128 provided.beforeMojoExecution(event);
129 }
130 }
131
132 public void afterMojoExecutionSuccess(MojoExecutionEvent event) throws MojoExecutionException {
133 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
134 provided.afterMojoExecutionSuccess(event);
135 }
136 }
137
138 public void afterExecutionFailure(MojoExecutionEvent event) {
139 for (WeakMojoExecutionListener provided : getProvidedListeners()) {
140 provided.afterExecutionFailure(event);
141 }
142 }
143
144 private Collection<WeakMojoExecutionListener> getProvidedListeners() {
145
146
147 IdentityHashMap<WeakMojoExecutionListener, Object> listeners = new IdentityHashMap<>();
148 for (Object provided : getScopeState().provided.values()) {
149 if (provided instanceof WeakMojoExecutionListener) {
150 listeners.put((WeakMojoExecutionListener) provided, null);
151 }
152 }
153 return listeners.keySet();
154 }
155 }