diff options
5 files changed, 453 insertions, 0 deletions
diff --git a/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java new file mode 100644 index 0000000000..b4b99ff9e5 --- /dev/null +++ b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java @@ -0,0 +1,97 @@ +/* + * 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.tuscany.sca.common.java.classloader; + +import java.io.IOException; +import java.net.URL; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Enumeration; +import java.util.List; + +import org.apache.tuscany.sca.common.java.collection.CompoundEnumeration; + +public class ClassLoaderDelegate extends ClassLoader { + private final List<ClassLoader> classLoaders = new ArrayList<ClassLoader>(); + + /** + * @param parent The parent classloaders + * @param loaders A list of classloaders to be used to load classes or resources + */ + public ClassLoaderDelegate(ClassLoader parent, ClassLoader... loaders) { + super(parent); + if (loaders != null) { + for (ClassLoader cl : loaders) { + if (cl != null && cl != parent && !classLoaders.contains(cl)) { + this.classLoaders.add(cl); + } + } + } + } + + /** + * @param parent The parent classloaders + * @param loaders A list of classloaders to be used to load classes or resources + */ + public ClassLoaderDelegate(ClassLoader parent, Collection<ClassLoader> loaders) { + super(parent); + if (loaders != null) { + for (ClassLoader cl : loaders) { + if (cl != null && cl != parent && !classLoaders.contains(cl)) { + this.classLoaders.add(cl); + } + } + } + } + + @Override + protected Class<?> findClass(String className) throws ClassNotFoundException { + for (ClassLoader parent : classLoaders) { + try { + return parent.loadClass(className); + } catch (ClassNotFoundException e) { + continue; + } + } + throw new ClassNotFoundException(className); + } + + @Override + protected URL findResource(String resName) { + for (ClassLoader parent : classLoaders) { + URL url = parent.getResource(resName); + if (url != null) { + return url; + } + } + return null; + } + + @SuppressWarnings("unchecked") + @Override + protected Enumeration<URL> findResources(String resName) throws IOException { + Enumeration<URL>[] enums = new Enumeration[classLoaders.size()]; + int index = 0; + for (ClassLoader parent : classLoaders) { + enums[index++] = parent.getResources(resName); + } + return new CompoundEnumeration<URL>(enums); + } +} diff --git a/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CollectionMap.java b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CollectionMap.java new file mode 100644 index 0000000000..cc3fb4676d --- /dev/null +++ b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CollectionMap.java @@ -0,0 +1,62 @@ +/* + * 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.tuscany.sca.common.java.collection; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.concurrent.ConcurrentHashMap; + +/** + * A Map with Collection values + */ +public class CollectionMap<K, V> extends ConcurrentHashMap<K, Collection<V>> { + private static final long serialVersionUID = -8926174610229029369L; + + public boolean putValue(K key, V value) { + Collection<V> collection = get(key); + if (collection == null) { + collection = createCollection(); + put(key, collection); + } + return collection.add(value); + } + + public boolean putValues(K key, Collection<? extends V> value) { + Collection<V> collection = get(key); + if (collection == null) { + collection = createCollection(); + put(key, collection); + } + return collection.addAll(value); + } + + public boolean removeValue(K key, V value) { + Collection<V> collection = get(key); + if (collection == null) { + return false; + } + return collection.remove(value); + } + + protected Collection<V> createCollection() { + return new ArrayList<V>(); + } + +} diff --git a/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CompoundEnumeration.java b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CompoundEnumeration.java new file mode 100644 index 0000000000..dc6a7e0f90 --- /dev/null +++ b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CompoundEnumeration.java @@ -0,0 +1,93 @@ +/* + * 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.tuscany.sca.common.java.collection; + +import java.util.Enumeration; +import java.util.NoSuchElementException; + +public class CompoundEnumeration<T> implements Enumeration<T> { + private Enumeration<T>[] enumerations = null; + private int index = 0; + + public CompoundEnumeration(Enumeration<T>... enums) { + enumerations = enums; + } + + public boolean hasMoreElements() { + // if the current enum is null that means this enum is finished + if (currentEnumeration() == null) { + // No next enum + return false; + } + // If the current enum has more elements, lets go + return currentEnumeration().hasMoreElements(); + } + + private Enumeration<T> findNextEnumeration(boolean moveCursor) { + return findNextEnumeration(index, moveCursor); + } + + private Enumeration<T> findNextEnumeration(int cursor, boolean moveCursor) { + // next place in the array + int next = cursor + 1; + // If the cursor is still in the array + if (next < enumerations.length) { + + // If there is something in that place + // AND the enum is not empty + if (enumerations[next] != null && enumerations[next].hasMoreElements()) { + // OK + if (moveCursor) { + index = next; + } + return enumerations[next]; + } + // Try next element + return findNextEnumeration(next, moveCursor); + } + // No more elements available + return null; + } + + public T nextElement() { + // ask for the next element of the current enum. + if (currentEnumeration() != null) { + return currentEnumeration().nextElement(); + } + + // no more elements in this Enum + // We must throw a NoSuchElementException + throw new NoSuchElementException("No more elements"); + } + + private Enumeration<T> currentEnumeration() { + if (enumerations != null) { + if (index < enumerations.length) { + Enumeration<T> e = enumerations[index]; + if (e == null || !e.hasMoreElements()) { + // the current enum is null or empty + // we probably want to switch to the next one + e = findNextEnumeration(true); + } + return e; + } + } + return null; + } +} diff --git a/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CompoundIterator.java b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CompoundIterator.java new file mode 100644 index 0000000000..997ba89881 --- /dev/null +++ b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/CompoundIterator.java @@ -0,0 +1,113 @@ +/* + * 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.tuscany.sca.common.java.collection; + +import java.util.Collection; +import java.util.Iterator; +import java.util.NoSuchElementException; + +public class CompoundIterator<T> implements Iterator<T> { + private Iterator<T>[] iterators = null; + private int index = 0; + + public CompoundIterator(Iterator<T>... iterators) { + this.iterators = iterators; + } + + @SuppressWarnings("unchecked") + public CompoundIterator(Collection<T>... collections) { + this.iterators = new Iterator[collections.length]; + for (int i = 0; i < collections.length; i++) { + this.iterators[i] = collections[i].iterator(); + } + } + + public boolean hasNext() { + // if the current enum is null that means this enum is finished + if (currentIterator() == null) { + // No next enum + return false; + } + // If the current enum has more elements, lets go + return currentIterator().hasNext(); + } + + private Iterator<T> findNextIterator(boolean moveCursor) { + return findNextIterator(index, moveCursor); + } + + private Iterator<T> findNextIterator(int cursor, boolean moveCursor) { + // next place in the array + int next = cursor + 1; + // If the cursor is still in the array + if (next < iterators.length) { + + // If there is something in that place + // AND the enum is not empty + if (iterators[next] != null && iterators[next].hasNext()) { + // OK + if (moveCursor) { + index = next; + } + return iterators[next]; + } + // Try next element + return findNextIterator(next, moveCursor); + } + // No more elements available + return null; + } + + public T next() { + // ask for the next element of the current enum. + if (currentIterator() != null) { + return currentIterator().next(); + } + + // no more elements in this Enum + // We must throw a NoSuchElementException + throw new NoSuchElementException("No more elements"); + } + + public void remove() { + // ask for the next element of the current enum. + if (currentIterator() != null) { + currentIterator().remove(); + } + + // no more elements in this Enum + // We must throw a NoSuchElementException + throw new NoSuchElementException("No more elements"); + } + + private Iterator<T> currentIterator() { + if (iterators != null) { + if (index < iterators.length) { + Iterator<T> e = iterators[index]; + if (e == null || !e.hasNext()) { + // the current enum is null or empty + // we probably want to switch to the next one + e = findNextIterator(true); + } + return e; + } + } + return null; + } +} diff --git a/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java new file mode 100644 index 0000000000..c9b46ca560 --- /dev/null +++ b/java/sca/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/collection/LRUCache.java @@ -0,0 +1,88 @@ +/* + * 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.tuscany.sca.common.java.collection; + +import java.util.LinkedHashMap; +import java.util.Map; + +/** + * A Simple LRU Cache + * + * @version $Revision$ + * @param <K> + * @param <V> + */ + +public class LRUCache<K, V> extends LinkedHashMap<K, V> { + private static final long serialVersionUID = -342098639681884413L; + protected int maxCacheSize = 4096; + + /** + * Default constructor for an LRU Cache The default capacity is 10000 + */ + public LRUCache() { + this(0, 4096, 0.75f, true); + } + + /** + * Constructs a LRUCache with a maximum capacity + * + * @param maximumCacheSize + */ + public LRUCache(int maximumCacheSize) { + this(0, maximumCacheSize, 0.75f, true); + } + + /** + * Constructs an empty <tt>LRUCache</tt> instance with the specified + * initial capacity, maximumCacheSize,load factor and ordering mode. + * + * @param initialCapacity the initial capacity. + * @param maximumCacheSize + * @param loadFactor the load factor. + * @param accessOrder the ordering mode - <tt>true</tt> for access-order, + * <tt>false</tt> for insertion-order. + * @throws IllegalArgumentException if the initial capacity is negative or + * the load factor is non-positive. + */ + + public LRUCache(int initialCapacity, int maximumCacheSize, float loadFactor, boolean accessOrder) { + super(initialCapacity, loadFactor, accessOrder); + this.maxCacheSize = maximumCacheSize; + } + + /** + * @return Returns the maxCacheSize. + */ + public int getMaxCacheSize() { + return maxCacheSize; + } + + /** + * @param maxCacheSize The maxCacheSize to set. + */ + public void setMaxCacheSize(int maxCacheSize) { + this.maxCacheSize = maxCacheSize; + } + + @Override + protected boolean removeEldestEntry(Map.Entry<K, V> eldest) { + return size() > maxCacheSize; + } +} |