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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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.pool;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Set;
import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
import ch.boye.httpclientandroidlib.util.Args;
import ch.boye.httpclientandroidlib.util.Asserts;
@NotThreadSafe
abstract class RouteSpecificPool<T, C, E extends PoolEntry<T, C>> {
private final T route;
private final Set<E> leased;
private final LinkedList<E> available;
private final LinkedList<PoolEntryFuture<E>> pending;
RouteSpecificPool(final T route) {
super();
this.route = route;
this.leased = new HashSet<E>();
this.available = new LinkedList<E>();
this.pending = new LinkedList<PoolEntryFuture<E>>();
}
protected abstract E createEntry(C conn);
public final T getRoute() {
return route;
}
public int getLeasedCount() {
return this.leased.size();
}
public int getPendingCount() {
return this.pending.size();
}
public int getAvailableCount() {
return this.available.size();
}
public int getAllocatedCount() {
return this.available.size() + this.leased.size();
}
public E getFree(final Object state) {
if (!this.available.isEmpty()) {
if (state != null) {
final Iterator<E> it = this.available.iterator();
while (it.hasNext()) {
final E entry = it.next();
if (state.equals(entry.getState())) {
it.remove();
this.leased.add(entry);
return entry;
}
}
}
final Iterator<E> it = this.available.iterator();
while (it.hasNext()) {
final E entry = it.next();
if (entry.getState() == null) {
it.remove();
this.leased.add(entry);
return entry;
}
}
}
return null;
}
public E getLastUsed() {
if (!this.available.isEmpty()) {
return this.available.getLast();
} else {
return null;
}
}
public boolean remove(final E entry) {
Args.notNull(entry, "Pool entry");
if (!this.available.remove(entry)) {
if (!this.leased.remove(entry)) {
return false;
}
}
return true;
}
public void free(final E entry, final boolean reusable) {
Args.notNull(entry, "Pool entry");
final boolean found = this.leased.remove(entry);
Asserts.check(found, "Entry %s has not been leased from this pool", entry);
if (reusable) {
this.available.addFirst(entry);
}
}
public E add(final C conn) {
final E entry = createEntry(conn);
this.leased.add(entry);
return entry;
}
public void queue(final PoolEntryFuture<E> future) {
if (future == null) {
return;
}
this.pending.add(future);
}
public PoolEntryFuture<E> nextPending() {
return this.pending.poll();
}
public void unqueue(final PoolEntryFuture<E> future) {
if (future == null) {
return;
}
this.pending.remove(future);
}
public void shutdown() {
for (final PoolEntryFuture<E> future: this.pending) {
future.cancel(true);
}
this.pending.clear();
for (final E entry: this.available) {
entry.close();
}
this.available.clear();
for (final E entry: this.leased) {
entry.close();
}
this.leased.clear();
}
@Override
public String toString() {
final StringBuilder buffer = new StringBuilder();
buffer.append("[route: ");
buffer.append(this.route);
buffer.append("][leased: ");
buffer.append(this.leased.size());
buffer.append("][available: ");
buffer.append(this.available.size());
buffer.append("][pending: ");
buffer.append(this.pending.size());
buffer.append("]");
return buffer.toString();
}
}
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