[#590][refactor] Fix for deadlock in WeakHashMap. Refactored all code that used a

WeakHashMap to fake a field.

1 files changed, 185 insertions, 0 deletions

diff --git a/src/utils/lombok/core/BooleanFieldAugment.java b/src/utils/lombok/core/BooleanFieldAugment.java
new file mode 100644
index 00000000..d843e9df
--- /dev/null
+++ b/src/utils/lombok/core/BooleanFieldAugment.java
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2014 The Project Lombok Authors.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok.core;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.Map;
+import java.util.WeakHashMap;
+
+/**
+ * Augments a instance of a type with a boolean field.
+ * <p>
+ * If the type already declares a boolean field, that field is used. Otherwise the field will be augmented.
+ * 
+ * @param <T> the type to augment.
+ */
+public abstract class BooleanFieldAugment<T> {
+	
+	/**
+	 * Augments a instance of a type with a boolean field.
+	 * <p>
+	 * If the type already declares a boolean instance field, that field might be used. Otherwise the field will be augmented.
+	 * <p>
+	 * This code assumes that for any combination of {@code type} and {@code name} this method is only called once.
+	 * Otherwise, whether state is shared is undefined.
+	 * 
+	 * @param type to augment
+	 * @param name of the field
+	 * @throws NullPointerException if {@code type} or {@code name} is {@code null}
+	 */
+	public static <T> BooleanFieldAugment<T> augment(Class<T> type, String name) {
+		checkNotNull(type, "type");
+		checkNotNull(name, "name");
+		Field booleanField = getBooleanField(type, name);
+		if (booleanField == null) {
+			return new MapFieldAugment<T>();
+		}
+		return new ExistingFieldAugment<T>(booleanField);
+	}
+	
+	private BooleanFieldAugment() {
+		// prevent external instantiation
+	}
+	
+	private static Field getBooleanField(Class<?> type, String name) {
+		try {
+			Field result = type.getDeclaredField(name);
+			if (Modifier.isStatic(result.getModifiers()) || result.getType() != boolean.class) {
+				return null;
+			}
+			result.setAccessible(true);
+			return result;
+		} catch (Throwable t) {
+			return null;
+		}
+	}
+	
+	/**
+	 * Sets the field to {@code true}.
+	 * @returns the previous value
+	 * @throws NullPointerException if {@code object} is {@code null}
+	 */
+	public abstract boolean set(T object);
+	
+	/**
+	 * Sets the field to {@code false}.
+	 * @returns the previous value
+	 * @throws NullPointerException if {@code object} is {@code null}
+	 */
+	public abstract boolean clear(T object);
+	
+	/**
+	 * @eturn {code true} if the field is set, otherwise {@code false}.
+	 * @throws NullPointerException if {@code object} is {@code null}
+	 */
+	public abstract boolean get(T object);
+	
+	private static class MapFieldAugment<T> extends BooleanFieldAugment<T> {
+		private static final Object MARKER = new Object();
+		
+		private final Map<T, Object> values = new WeakHashMap<T,Object>();
+		
+		public boolean set(T object) {
+			checkNotNull(object, "object");
+			synchronized (values) {
+				return values.put(object, MARKER) != null;
+			}
+		}
+		
+		public boolean clear(T object) {
+			checkNotNull(object, "object");
+			synchronized (values) {
+				return values.remove(object) != null;
+			}
+		}
+		
+		public boolean get(T object) {
+			checkNotNull(object, "object");
+			synchronized (values) {
+				return values.get(object) != null;
+			}
+		}
+	}
+	
+	private static class ExistingFieldAugment<T> extends BooleanFieldAugment<T> {
+		private final Object lock = new Object();
+		private final Field booleanField;
+		
+		private ExistingFieldAugment(Field booleanField) {
+			this.booleanField = booleanField;
+		}
+		
+		@Override public boolean set(T object) {
+			checkNotNull(object, "object");
+			try {
+				synchronized (lock) {
+					boolean result = booleanField.getBoolean(object);
+					booleanField.setBoolean(object, true);
+					return result;
+				}
+			} catch (IllegalAccessException e) {
+				throw sneakyThrow(e);
+			}
+		}
+		
+		@Override public boolean clear(T object) {
+			checkNotNull(object, "object");
+			try {
+				synchronized (lock) {
+					boolean result = booleanField.getBoolean(object);
+					booleanField.setBoolean(object, false);
+					return result;
+				}
+			} catch (IllegalAccessException e) {
+				throw sneakyThrow(e);
+			}
+		}
+		
+		@Override public boolean get(T object) {
+			checkNotNull(object, "object");
+			try {
+				synchronized (lock) {
+					return booleanField.getBoolean(object);
+				}
+			} catch (IllegalAccessException e) {
+				throw sneakyThrow(e);
+			}
+		}
+	}
+	
+	private static <T> T checkNotNull(T object, String name) {
+		if (object == null) throw new NullPointerException(name);
+		return object;
+	}
+	
+	private static RuntimeException sneakyThrow(Throwable t) {
+		if (t == null) throw new NullPointerException("t");
+		BooleanFieldAugment.<RuntimeException>sneakyThrow0(t);
+		return null;
+	}
+	
+	@SuppressWarnings("unchecked")
+	private static <T extends Throwable> void sneakyThrow0(Throwable t) throws T {
+		throw (T)t;
+	}
+}
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