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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.maven.execution.scope.internal;
import java.util.Collection;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.LinkedList;
import java.util.Map;
import com.google.inject.Key;
import com.google.inject.OutOfScopeException;
import com.google.inject.Provider;
import com.google.inject.Scope;
import com.google.inject.util.Providers;
import org.apache.maven.execution.MojoExecutionEvent;
import org.apache.maven.execution.MojoExecutionListener;
import org.apache.maven.execution.scope.WeakMojoExecutionListener;
import org.apache.maven.plugin.MojoExecutionException;
/**
* MojoExecutionScope
*/
public class MojoExecutionScope implements Scope, MojoExecutionListener {
private static final Provider<Object> SEEDED_KEY_PROVIDER = () -> {
throw new IllegalStateException();
};
private static final class ScopeState {
private final Map<Key<?>, Provider<?>> seeded = new HashMap<>();
private final Map<Key<?>, Object> provided = new HashMap<>();
}
private final ThreadLocal<LinkedList<ScopeState>> values = new ThreadLocal<>();
public MojoExecutionScope() {}
public void enter() {
LinkedList<ScopeState> stack = values.get();
if (stack == null) {
stack = new LinkedList<>();
values.set(stack);
}
stack.addFirst(new ScopeState());
}
private ScopeState getScopeState() {
LinkedList<ScopeState> stack = values.get();
if (stack == null || stack.isEmpty()) {
throw new IllegalStateException();
}
return stack.getFirst();
}
public void exit() throws MojoExecutionException {
final LinkedList<ScopeState> stack = values.get();
if (stack == null || stack.isEmpty()) {
throw new IllegalStateException();
}
stack.removeFirst();
if (stack.isEmpty()) {
values.remove();
}
}
public <T> void seed(Class<T> clazz, Provider<T> value) {
getScopeState().seeded.put(Key.get(clazz), value);
}
public <T> void seed(Class<T> clazz, final T value) {
getScopeState().seeded.put(Key.get(clazz), Providers.of(value));
}
public <T> Provider<T> scope(final Key<T> key, final Provider<T> unscoped) {
return () -> {
LinkedList<ScopeState> stack = values.get();
if (stack == null || stack.isEmpty()) {
throw new OutOfScopeException("Cannot access " + key + " outside of a scoping block");
}
ScopeState state = stack.getFirst();
Provider<?> seeded = state.seeded.get(key);
if (seeded != null) {
return (T) seeded.get();
}
T provided = (T) state.provided.get(key);
if (provided == null && unscoped != null) {
provided = unscoped.get();
state.provided.put(key, provided);
}
return provided;
};
}
@SuppressWarnings({"unchecked"})
public static <T> Provider<T> seededKeyProvider() {
return (Provider<T>) SEEDED_KEY_PROVIDER;
}
public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
for (WeakMojoExecutionListener provided : getProvidedListeners()) {
provided.beforeMojoExecution(event);
}
}
public void afterMojoExecutionSuccess(MojoExecutionEvent event) throws MojoExecutionException {
for (WeakMojoExecutionListener provided : getProvidedListeners()) {
provided.afterMojoExecutionSuccess(event);
}
}
public void afterExecutionFailure(MojoExecutionEvent event) {
for (WeakMojoExecutionListener provided : getProvidedListeners()) {
provided.afterExecutionFailure(event);
}
}
private Collection<WeakMojoExecutionListener> getProvidedListeners() {
// the same instance can be provided multiple times under different Key's
// deduplicate instances to avoid redundant beforeXXX/afterXXX callbacks
IdentityHashMap<WeakMojoExecutionListener, Object> listeners = new IdentityHashMap<>();
for (Object provided : getScopeState().provided.values()) {
if (provided instanceof WeakMojoExecutionListener) {
listeners.put((WeakMojoExecutionListener) provided, null);
}
}
return listeners.keySet();
}
}