Author: brentworden
Date: Fri Aug 24 05:08:36 2012
New Revision: 1376827
URL: http://svn.apache.org/viewvc?rev=1376827&view=rev
Log:
COLLECTIONS-241 added PassiveExpiringMap and tests
Added:
commons/proper/collections/trunk/src/main/java/org/apache/commons/collections/map/PassiveExpiringMap.java
(with props)
commons/proper/collections/trunk/src/test/java/org/apache/commons/collections/map/TestPassiveExpiringMap.java
Added:
commons/proper/collections/trunk/src/main/java/org/apache/commons/collections/map/PassiveExpiringMap.java
URL:
http://svn.apache.org/viewvc/commons/proper/collections/trunk/src/main/java/org/apache/commons/collections/map/PassiveExpiringMap.java?rev=1376827&view=auto
==============================================================================
---
commons/proper/collections/trunk/src/main/java/org/apache/commons/collections/map/PassiveExpiringMap.java
(added)
+++
commons/proper/collections/trunk/src/main/java/org/apache/commons/collections/map/PassiveExpiringMap.java
Fri Aug 24 05:08:36 2012
@@ -0,0 +1,577 @@
+/*
+ * 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.commons.collections.map;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Decorates a <code>Map</code> to evict expired entries once their expiration
+ * time has been reached.
+ * <p>
+ * When putting a key-value pair in the map this decorator uses a
+ * {@link ExpirationPolicy} to determine how long the entry should remain alive
+ * as defined by an expiration time value.
+ * </p>
+ * <p>
+ * When accessing the mapped value for a key, its expiration time is checked,
+ * and if it is a negative value or if it is greater than the current time, the
+ * mapped value is returned. Otherwise, the key is removed from the decorated
+ * map, and <code>null</code> is returned.
+ * </p>
+ * <p>
+ * When invoking methods that involve accessing the entire map contents (i.e
+ * {@link #containsKey(Object)}, {@link #entrySet()}, etc.) this decorator
+ * removes all expired entries prior to actually completing the invocation.
+ * </p>
+ * <p>
+ * <strong>Note that {@link PassiveExpiringMap} is not synchronized and is not
+ * thread-safe.</strong> If you wish to use this map from multiple threads
+ * concurrently, you must use appropriate synchronization. The simplest
approach
+ * is to wrap this map using {@link
java.util.Collections#synchronizedMap(Map)}.
+ * This class may throw exceptions when accessed by concurrent threads without
+ * synchronization.
+ * </p>
+ *
+ * @param <K>
+ * the type of the keys in the map
+ *
+ * @param <V>
+ * the type of the values in the map
+ *
+ * @since 4.0
+ * @version $Id: $
+ */
+public class PassiveExpiringMap<K, V> extends AbstractMapDecorator<K, V>
+ implements Serializable {
+
+ /**
+ * A {@link ExpirationPolicy} that returns a expiration time that is a
+ * constant about of time in the future from the current time.
+ *
+ * @param <K>
+ * the type of the keys in the map
+ * @param <V>
+ * the type of the values in the map
+ *
+ * @since 4.0
+ * @version $Id: $
+ */
+ public static class ConstantTimeToLiveExpirationPolicy<K, V> implements
+ ExpirationPolicy<K, V> {
+
+ /** Serialization version */
+ private static final long serialVersionUID = 1L;
+
+ /** the constant time-to-live value measured in milliseconds. */
+ private final long timeToLiveMillis;
+
+ /**
+ * Default constructor. Constructs a policy using a negative
+ * time-to-live value that results in entries never expiring.
+ */
+ public ConstantTimeToLiveExpirationPolicy() {
+ this(-1L);
+ }
+
+ /**
+ * Construct a policy with the given time-to-live constant
measured in
+ * milliseconds. A negative time-to-live value indicates
entries never
+ * expire. A zero time-to-live value indicates entries expire
(nearly)
+ * immediately.
+ *
+ * @param timeToLiveMillis
+ * the constant amount of time (in milliseconds) an
entry is
+ * available before it expires. A negative value
results in
+ * entries that NEVER expire. A zero value results
in entries
+ * that ALWAYS expire.
+ */
+ public ConstantTimeToLiveExpirationPolicy(long
timeToLiveMillis) {
+ super();
+ this.timeToLiveMillis = timeToLiveMillis;
+ }
+
+ /**
+ * Construct a policy with the given time-to-live constant
measured in
+ * the given time unit of measure.
+ *
+ * @param timeToLive
+ * the constant amount of time an entry is available
before
+ * it expires. A negative value results in entries
that NEVER
+ * expire. A zero value results in entries that
ALWAYS
+ * expire.
+ * @param timeUnit
+ * the unit of time for the <code>timeToLive</code>
+ * parameter, must not be null.
+ * @throws IllegalArgumentException
+ * if the time unit is null.
+ */
+ public ConstantTimeToLiveExpirationPolicy(long timeToLive,
+ TimeUnit timeUnit) {
+ this(validateAndConvertToMillis(timeToLive,
TimeUnit.MILLISECONDS));
+ }
+
+ /**
+ * Determine the expiration time for the given key-value entry.
+ *
+ * @param key
+ * the key for the entry (ignored).
+ * @param value
+ * the value for the entry (ignored).
+ * @return if {@link #timeToLiveMillis} ≥ 0, an expiration
time of
+ * {@link #timeToLiveMillis} +
+ * {@link System#currentTimeMillis()} is returned.
Otherwise, -1
+ * is returned indicating the entry never expires.
+ */
+ public long expirationTime(K key, V value) {
+ if (timeToLiveMillis >= 0L) {
+ // avoid numerical overflow
+ long now = System.currentTimeMillis();
+ if (now > Long.MAX_VALUE - timeToLiveMillis) {
+ // expiration would be greater than
Long.MAX_VALUE
+ // never expire
+ return -1;
+ }
+
+ // timeToLiveMillis in the future
+ return now + timeToLiveMillis;
+ }
+
+ // never expire
+ return -1L;
+ }
+ }
+
+ /**
+ * A policy to determine the expiration time for key-value entries.
+ *
+ * @param <K>
+ * the key object type.
+ * @param <V>
+ * the value object type
+ *
+ * @since 4.0
+ * @version $Id: $
+ */
+ public static interface ExpirationPolicy<K, V> extends Serializable {
+ /**
+ * Determine the expiration time for the given key-value entry.
+ *
+ * @param key
+ * the key for the entry.
+ * @param value
+ * the value for the entry.
+ * @return the expiration time value measured in milliseconds. A
+ * negative return value indicates the entry never
expires.
+ */
+ long expirationTime(K key, V value);
+ }
+
+ /** Serialization version */
+ private static final long serialVersionUID = 1L;
+
+ /**
+ * First validate the input parameters. If the parameters are valid,
convert
+ * the given time measured in the given units to the same time measured
in
+ * milliseconds. If the parameters are invalid, an
+ * {@link IllegalArgumentException} is thrown.
+ *
+ * @param timeToLive
+ * the constant amount of time an entry is available before
it
+ * expires. A negative value results in entries that NEVER
+ * expire. A zero value results in entries that ALWAYS
expire.
+ * @param timeUnit
+ * the unit of time for the <code>timeToLive</code>
parameter,
+ * must not be null.
+ * @throws IllegalArgumentException
+ * if the time unit is null.
+ */
+ private static long validateAndConvertToMillis(long timeToLive,
+ TimeUnit timeUnit) {
+ if (timeUnit == null) {
+ throw new IllegalArgumentException("Time unit must not
be null");
+ }
+ return timeUnit.convert(timeToLive, TimeUnit.MILLISECONDS);
+ }
+
+ /** map used to manage expiration times for the actual map entries. */
+ private final Map<Object, Long> expirationMap = new HashMap<Object,
Long>();
+
+ /** the policy used to determine time-to-live values for map entries. */
+ private final ExpirationPolicy<K, V> expiringPolicy;
+
+ /**
+ * Default constructor. Constructs a map decorator that results in
entries
+ * NEVER expiring.
+ */
+ public PassiveExpiringMap() {
+ this(-1L);
+ }
+
+ /**
+ * Construct a map decorator using the given expiration policy to
determine
+ * expiration times.
+ *
+ * @param expiringPolicy
+ * the policy used to determine expiration times of entries
as
+ * they are added.
+ */
+ public PassiveExpiringMap(ExpirationPolicy<K, V> expiringPolicy) {
+ this(expiringPolicy, new HashMap<K, V>());
+ }
+
+ /**
+ * Construct a map decorator that decorates the given map and uses the
given
+ * expiration policy to determine expiration times. If there are any
+ * elements already in the map being decorated, they will NEVER expire
+ * unless they are replaced.
+ *
+ * @param expiringPolicy
+ * the policy used to determine expiration times of entries
as
+ * they are added.
+ * @param map
+ * the map to decorate, must not be null.
+ * @throws IllegalArgumentException
+ * if the map is null.
+ */
+ public PassiveExpiringMap(ExpirationPolicy<K, V> expiringPolicy,
+ Map<K, V> map) {
+ super(map);
+ if (expiringPolicy == null) {
+ throw new IllegalArgumentException("Policy must not be
null.");
+ }
+ this.expiringPolicy = expiringPolicy;
+ }
+
+ /**
+ * Construct a map decorator that decorates the given map using the
given
+ * time-to-live value measured in milliseconds to create and use a
+ * {@link ConstantTimeToLiveExpirationPolicy} expiration policy.
+ *
+ * @param timeToLiveMillis
+ * the constant amount of time (in milliseconds) an entry is
+ * available before it expires. A negative value results in
+ * entries that NEVER expire. A zero value results in entries
+ * that ALWAYS expire.
+ */
+ public PassiveExpiringMap(long timeToLiveMillis) {
+ this(new ConstantTimeToLiveExpirationPolicy<K,
V>(timeToLiveMillis),
+ new HashMap<K, V>());
+ }
+
+ /**
+ * Construct a map decorator using the given time-to-live value
measured in
+ * milliseconds to create and use a
+ * {@link ConstantTimeToLiveExpirationPolicy} expiration policy. If
there
+ * are any elements already in the map being decorated, they will NEVER
+ * expire unless they are replaced.
+ *
+ * @param timeToLiveMillis
+ * the constant amount of time (in milliseconds) an entry is
+ * available before it expires. A negative value results in
+ * entries that NEVER expire. A zero value results in entries
+ * that ALWAYS expire.
+ * @param map
+ * the map to decorate, must not be null.
+ * @throws IllegalArgumentException
+ * if the map is null.
+ */
+ public PassiveExpiringMap(long timeToLiveMillis, Map<K, V> map) {
+ this(new ConstantTimeToLiveExpirationPolicy<K,
V>(timeToLiveMillis),
+ map);
+ }
+
+ /**
+ * Construct a map decorator using the given time-to-live value
measured in
+ * the given time units of measure to create and use a
+ * {@link ConstantTimeToLiveExpirationPolicy} expiration policy.
+ *
+ * @param timeToLive
+ * the constant amount of time an entry is available before
it
+ * expires. A negative value results in entries that NEVER
+ * expire. A zero value results in entries that ALWAYS
expire.
+ * @param timeUnit
+ * the unit of time for the <code>timeToLive</code>
parameter,
+ * must not be null.
+ * @throws IllegalArgumentException
+ * if the time unit is null.
+ */
+ public PassiveExpiringMap(long timeToLive, TimeUnit timeUnit) {
+ this(validateAndConvertToMillis(timeToLive, timeUnit));
+ }
+
+ /**
+ * Construct a map decorator that decorates the given map using the
given
+ * time-to-live value measured in the given time units of measure to
create
+ * {@link ConstantTimeToLiveExpirationPolicy} expiration policy. This
policy
+ * is used to determine expiration times. If there are any elements
already
+ * in the map being decorated, they will NEVER expire unless they are
+ * replaced.
+ *
+ * @param timeToLive
+ * the constant amount of time an entry is available before
it
+ * expires. A negative value results in entries that NEVER
+ * expire. A zero value results in entries that ALWAYS
expire.
+ * @param timeUnit
+ * the unit of time for the <code>timeToLive</code>
parameter,
+ * must not be null.
+ * @throws IllegalArgumentException
+ * if the time unit is null.
+ * @param map
+ * the map to decorate, must not be null.
+ * @throws IllegalArgumentException
+ * if the map is null.
+ */
+ public PassiveExpiringMap(long timeToLive, TimeUnit timeUnit, Map<K, V>
map) {
+ this(validateAndConvertToMillis(timeToLive, timeUnit), map);
+ }
+
+ /**
+ * Constructs a map decorator that decorates the given map and results
in
+ * entries NEVER expiring. If there are any elements already in the map
+ * being decorated, they also will NEVER expire.
+ *
+ * @param map
+ * the map to decorate, must not be null.
+ * @throws IllegalArgumentException
+ * if the map is null.
+ */
+ public PassiveExpiringMap(Map<K, V> map) {
+ this(-1L, map);
+ }
+
+ /**
+ * Normal {@link Map#clear()} behavior with the addition of clearing all
+ * expiration entries as well.
+ */
+ @Override
+ public void clear() {
+ super.clear();
+ expirationMap.clear();
+ }
+
+ /**
+ * All expired entries are removed from the map prior to determining the
+ * contains result.
+ */
+ @Override
+ public boolean containsKey(Object key) {
+ removeIfExpired(key, now());
+ return super.containsKey(key);
+ }
+
+ /**
+ * All expired entries are removed from the map prior to determining the
+ * contains result.
+ */
+ @Override
+ public boolean containsValue(Object value) {
+ removeAllExpired(now());
+ return super.containsValue(value);
+ }
+
+ /**
+ * All expired entries are removed from the map prior to returning the
entry
+ * set.
+ */
+ @Override
+ public Set<Entry<K, V>> entrySet() {
+ removeAllExpired(now());
+ return super.entrySet();
+ }
+
+ /**
+ * All expired entries are removed from the map prior to returning the
entry
+ * value.
+ */
+ @Override
+ public V get(Object key) {
+ removeIfExpired(key, now());
+ return super.get(key);
+ }
+
+ /**
+ * All expired entries are removed from the map prior to determining if
it
+ * is empty.
+ */
+ @Override
+ public boolean isEmpty() {
+ removeAllExpired(now());
+ return super.isEmpty();
+ }
+
+ /**
+ * Determines if the given expiration time is less than <code>now</code>
+ *
+ * @param now
+ * the time in milliseconds used to compare against the
+ * expiration time.
+ * @param expirationTimeObject
+ * the expiration time value retrieved from
+ * {@link #expirationMap}, can be null.
+ * @return <code>true</code> if <code>expirationTimeObject</code> is
≥ 0
+ * and <code>expirationTimeObject</code> < <code>now</code>.
+ * <code>false</code> otherwise.
+ */
+ private boolean isExpired(long now, Long expirationTimeObject) {
+ if (expirationTimeObject != null) {
+ long expirationTime = expirationTimeObject.longValue();
+ return (expirationTime >= 0 && now >= expirationTime);
+ }
+ return false;
+ }
+
+ /**
+ * All expired entries are removed from the map prior to returning the
key
+ * set.
+ */
+ @Override
+ public Set<K> keySet() {
+ removeAllExpired(now());
+ return super.keySet();
+ }
+
+ /**
+ * The current time in milliseconds.
+ */
+ private long now() {
+ return System.currentTimeMillis();
+ }
+
+ @Override
+ public V put(K key, V value) {
+ return put(key, value, now());
+ }
+
+ /**
+ * Add the given key-value pair to this map as well as recording the
entry's
+ * expiration time based on the current time in milliseconds,
+ * <code>now</code> and this map's {@link #expiringPolicy}.
+ */
+ private V put(K key, V value, long now) {
+ // record expiration time of new entry
+ long expirationTime = expiringPolicy.expirationTime(key, value);
+ expirationMap.put(key, Long.valueOf(expirationTime));
+
+ return super.put(key, value);
+ }
+
+ @Override
+ public void putAll(Map<? extends K, ? extends V> mapToCopy) {
+ for (Map.Entry<? extends K, ? extends V> entry :
mapToCopy.entrySet()) {
+ put(entry.getKey(), entry.getValue());
+ }
+ }
+
+ /**
+ * Normal {@link Map#remove(Object)} behavior with the addition of
removing
+ * any expiration entry as well.
+ */
+ @Override
+ public V remove(Object key) {
+ expirationMap.remove(key);
+ return super.remove(key);
+ }
+
+ /**
+ * Removes all entries in the map whose expiration time is less than
+ * <code>now</code>. The exceptions are entries with negative expiration
+ * times; those entries are never removed.
+ *
+ * @see #isExpired(long, Long)
+ */
+ private void removeAllExpired(long now) {
+ Iterator<Map.Entry<Object, Long>> iter =
expirationMap.entrySet()
+ .iterator();
+ while (iter.hasNext()) {
+ Map.Entry<Object, Long> expirationEntry = iter.next();
+ if (isExpired(now, expirationEntry.getValue())) {
+ // remove entry from collection
+ super.remove(expirationEntry.getKey());
+ // remove entry from expiration map
+ iter.remove();
+ }
+ }
+ }
+
+ /**
+ * Removes the entry with the given key if the entry's expiration time
is
+ * less than <code>now</code>. If the entry has a negative expiration
time,
+ * the entry is never removed.
+ */
+ private void removeIfExpired(Object key, long now) {
+ Long expirationTimeObject = expirationMap.get(key);
+ if (isExpired(now, expirationTimeObject)) {
+ remove(key);
+ }
+ }
+
+ /**
+ * All expired entries are removed from the map prior to returning the
size.
+ */
+ @Override
+ public int size() {
+ removeAllExpired(now());
+ return super.size();
+ }
+
+ /**
+ * Read the map in using a custom routine.
+ *
+ * @param in
+ * the input stream
+ * @throws IOException
+ * @throws ClassNotFoundException
+ */
+ @SuppressWarnings("unchecked")
+ // (1) should only fail if input stream is incorrect
+ private void readObject(ObjectInputStream in) throws IOException,
+ ClassNotFoundException {
+ in.defaultReadObject();
+ map = (Map<K, V>) in.readObject(); // (1)
+ }
+
+ /**
+ * Write the map out using a custom routine.
+ *
+ * @param out
+ * the output stream
+ * @throws IOException
+ */
+ private void writeObject(ObjectOutputStream out) throws IOException {
+ out.defaultWriteObject();
+ out.writeObject(map);
+ }
+
+ /**
+ * All expired entries are removed from the map prior to returning the
value
+ * collection.
+ */
+ @Override
+ public Collection<V> values() {
+ removeAllExpired(now());
+ return super.values();
+ }
+}
Propchange:
commons/proper/collections/trunk/src/main/java/org/apache/commons/collections/map/PassiveExpiringMap.java
------------------------------------------------------------------------------
svn:eol-style = native
Added:
commons/proper/collections/trunk/src/test/java/org/apache/commons/collections/map/TestPassiveExpiringMap.java
URL:
http://svn.apache.org/viewvc/commons/proper/collections/trunk/src/test/java/org/apache/commons/collections/map/TestPassiveExpiringMap.java?rev=1376827&view=auto
==============================================================================
---
commons/proper/collections/trunk/src/test/java/org/apache/commons/collections/map/TestPassiveExpiringMap.java
(added)
+++
commons/proper/collections/trunk/src/test/java/org/apache/commons/collections/map/TestPassiveExpiringMap.java
Fri Aug 24 05:08:36 2012
@@ -0,0 +1,207 @@
+package org.apache.commons.collections.map;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+import junit.framework.Test;
+
+import org.apache.commons.collections.BulkTest;
+import org.apache.commons.collections.map.PassiveExpiringMap.ExpirationPolicy;
+
+public class TestPassiveExpiringMap<K, V> extends AbstractTestMap<K, V> {
+
+ private static class TestExpirationPolicy implements
+ ExpirationPolicy<Integer, String> {
+
+ private static final long serialVersionUID = 1L;
+
+ public long expirationTime(Integer key, String value) {
+ // odd keys expire immediately, even keys never expire
+ if (key == null) {
+ return 0;
+ }
+
+ if (key.intValue() % 2 == 0) {
+ return -1;
+ }
+
+ return 0;
+ }
+ }
+
+ public static Test suite() {
+ return BulkTest.makeSuite(TestPassiveExpiringMap.class);
+ }
+
+ public TestPassiveExpiringMap(String testName) {
+ super(testName);
+ }
+
+ // public void testCreate() throws Exception {
+ // writeExternalFormToDisk((java.io.Serializable) makeObject(),
+ // "PassiveExpiringMap.emptyCollection.version4.obj");
+ //
+ // writeExternalFormToDisk((java.io.Serializable) makeFullMap(),
+ // "PassiveExpiringMap.fullCollection.version4.obj");
+ // }
+
+ @Override
+ public String getCompatibilityVersion() {
+ return "4";
+ }
+
+ private Map<Integer, String> makeDecoratedTestMap() {
+ Map<Integer, String> m = new HashMap<Integer, String>();
+ m.put(Integer.valueOf(1), "one");
+ m.put(Integer.valueOf(2), "two");
+ m.put(Integer.valueOf(3), "three");
+ m.put(Integer.valueOf(4), "four");
+ m.put(Integer.valueOf(5), "five");
+ m.put(Integer.valueOf(6), "six");
+ return new PassiveExpiringMap<Integer, String>(
+ new TestExpirationPolicy(), m);
+ }
+
+ @Override
+ public Map<K, V> makeObject() {
+ return new PassiveExpiringMap<K, V>();
+ }
+
+ private Map<Integer, String> makeTestMap() {
+ Map<Integer, String> m = new PassiveExpiringMap<Integer,
String>(
+ new TestExpirationPolicy());
+ m.put(Integer.valueOf(1), "one");
+ m.put(Integer.valueOf(2), "two");
+ m.put(Integer.valueOf(3), "three");
+ m.put(Integer.valueOf(4), "four");
+ m.put(Integer.valueOf(5), "five");
+ m.put(Integer.valueOf(6), "six");
+ return m;
+ }
+
+ public void testConstructors() {
+ try {
+ Map<String, String> map = null;
+ new PassiveExpiringMap<String, String>(map);
+ fail("constructor - exception should have been
thrown.");
+ } catch (IllegalArgumentException ex) {
+ // success
+ }
+
+ try {
+ ExpirationPolicy<String, String> policy = null;
+ new PassiveExpiringMap<String, String>(policy);
+ fail("constructor - exception should have been
thrown.");
+ } catch (IllegalArgumentException ex) {
+ // success
+ }
+
+ try {
+ TimeUnit unit = null;
+ new PassiveExpiringMap<String, String>(10L, unit);
+ fail("constructor - exception should have been
thrown.");
+ } catch (IllegalArgumentException ex) {
+ // success
+ }
+ }
+
+ public void testContainsKey() {
+ Map<Integer, String> m = makeTestMap();
+ assertFalse(m.containsKey(Integer.valueOf(1)));
+ assertFalse(m.containsKey(Integer.valueOf(3)));
+ assertFalse(m.containsKey(Integer.valueOf(5)));
+ assertTrue(m.containsKey(Integer.valueOf(2)));
+ assertTrue(m.containsKey(Integer.valueOf(4)));
+ assertTrue(m.containsKey(Integer.valueOf(6)));
+ }
+
+ public void testContainsValue() {
+ Map<Integer, String> m = makeTestMap();
+ assertFalse(m.containsValue("one"));
+ assertFalse(m.containsValue("three"));
+ assertFalse(m.containsValue("five"));
+ assertTrue(m.containsValue("two"));
+ assertTrue(m.containsValue("four"));
+ assertTrue(m.containsValue("six"));
+ }
+
+ public void testDecoratedMap() {
+ // entries shouldn't expire
+ Map<Integer, String> m = makeDecoratedTestMap();
+ assertEquals(6, m.size());
+ assertEquals("one", m.get(Integer.valueOf(1)));
+
+ // removing a single item shouldn't affect any other items
+ assertEquals("two", m.get(Integer.valueOf(2)));
+ m.remove(Integer.valueOf(2));
+ assertEquals(5, m.size());
+ assertEquals("one", m.get(Integer.valueOf(1)));
+ assertNull(m.get(Integer.valueOf(2)));
+
+ // adding a single, even item shouldn't affect any other items
+ assertNull(m.get(Integer.valueOf(2)));
+ m.put(Integer.valueOf(2), "two");
+ assertEquals(6, m.size());
+ assertEquals("one", m.get(Integer.valueOf(1)));
+ assertEquals("two", m.get(Integer.valueOf(2)));
+
+ // adding a single, odd item (one that expires) shouldn't
affect any
+ // other items
+ // put the entry expires immediately
+ m.put(Integer.valueOf(1), "one-one");
+ assertEquals(5, m.size());
+ assertNull(m.get(Integer.valueOf(1)));
+ assertEquals("two", m.get(Integer.valueOf(2)));
+ }
+
+ public void testEntrySet() {
+ Map<Integer, String> m = makeTestMap();
+ assertEquals(3, m.entrySet().size());
+ }
+
+ public void testGet() {
+ Map<Integer, String> m = makeTestMap();
+ assertNull(m.get(Integer.valueOf(1)));
+ assertEquals("two", m.get(Integer.valueOf(2)));
+ assertNull(m.get(Integer.valueOf(3)));
+ assertEquals("four", m.get(Integer.valueOf(4)));
+ assertNull(m.get(Integer.valueOf(5)));
+ assertEquals("six", m.get(Integer.valueOf(6)));
+ }
+
+ public void testIsEmpty() {
+ Map<Integer, String> m = makeTestMap();
+ assertFalse(m.isEmpty());
+
+ // remove just evens
+ m = makeTestMap();
+ m.remove(Integer.valueOf(2));
+ m.remove(Integer.valueOf(4));
+ m.remove(Integer.valueOf(6));
+ assertTrue(m.isEmpty());
+ }
+
+ public void testKeySet() {
+ Map<Integer, String> m = makeTestMap();
+ assertEquals(3, m.keySet().size());
+ }
+
+ public void testSize() {
+ Map<Integer, String> m = makeTestMap();
+ assertEquals(3, m.size());
+ }
+
+ public void testValues() {
+ Map<Integer, String> m = makeTestMap();
+ assertEquals(3, m.values().size());
+ }
+
+ public void testZeroTimeToLive() {
+ // item should not be available
+ PassiveExpiringMap<String, String> m = new
PassiveExpiringMap<String, String>(
+ 0L);
+ m.put("a", "b");
+ assertNull(m.get("a"));
+ }
+}
