Java tutorial
/************************************************************************* * Copyright 2009-2012 Eucalyptus Systems, Inc. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 3 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see http://www.gnu.org/licenses/. * * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need * additional information or have any questions. * * This file may incorporate work covered under the following copyright * and permission notice: * * Software License Agreement (BSD License) * * Copyright (c) 2008, Regents of the University of California * All rights reserved. * * Redistribution and use of this software in source and binary forms, * with or without modification, are permitted provided that the * following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE * THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL, * COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE, * AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING * IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, * SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY, * WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION, * REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO * IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT * NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS. ************************************************************************/ package com.eucalyptus.ws.server; import java.util.Collections; import java.util.Map; import java.util.Set; import java.util.concurrent.TimeUnit; import javax.annotation.Nullable; import org.apache.log4j.Logger; import org.jboss.netty.channel.ChannelFuture; import org.jboss.netty.channel.ChannelHandler; import org.jboss.netty.channel.ChannelPipeline; import org.jboss.netty.handler.codec.http.HttpRequest; import org.xbill.DNS.Name; import org.xbill.DNS.TextParseException; import com.eucalyptus.component.ComponentId; import com.eucalyptus.component.annotation.ComponentPart; import com.eucalyptus.records.EventRecord; import com.eucalyptus.records.EventType; import com.eucalyptus.records.Logs; import com.eucalyptus.system.Ats; import com.eucalyptus.util.Filterable; import com.eucalyptus.util.HasName; import com.eucalyptus.util.dns.DomainNames; import com.google.common.base.Splitter; import com.google.common.base.Supplier; import com.google.common.base.Suppliers; import com.google.common.collect.ImmutableSet; import com.google.common.collect.Iterables; public abstract class FilteredPipeline implements HasName<FilteredPipeline>, Filterable<HttpRequest> { private static Logger LOG = Logger.getLogger(FilteredPipeline.class); private static final Splitter hostSplitter = Splitter.on(':').limit(2); private final Supplier<Set<Name>> nameSupplier = Suppliers.memoizeWithExpiration(new NamesSupplier(getClass()), 15, TimeUnit.SECONDS); protected abstract static class InternalPipeline extends FilteredPipeline { private final ComponentId componentId; InternalPipeline(ComponentId componentId) { this.componentId = componentId; } private ComponentId getComponentId() { return this.componentId; } } public FilteredPipeline() { } public abstract String getName(); public void unroll(final ChannelPipeline pipeline) { try { this.addHandlers(pipeline); if (Logs.isExtrrreeeme()) { for (final Map.Entry<String, ChannelHandler> e : pipeline.toMap().entrySet()) { EventRecord.here(this.getClass(), EventType.PIPELINE_HANDLER, e.getKey(), e.getValue().getClass().getSimpleName()).trace(); } } } catch (final Exception e) { LOG.error("Error unrolling pipeline: " + this.getName()); final ChannelFuture close = pipeline.getChannel().close(); close.awaitUninterruptibly(); LOG.error("Forced pipeline to close due to exception: ", e); } } public abstract ChannelPipeline addHandlers(ChannelPipeline pipeline); @Override public abstract boolean checkAccepts(HttpRequest message); @Override public final int compareTo(final FilteredPipeline o) { return this.getName().compareTo(this.getName()); } protected boolean resolvesByHost(@Nullable final String host) { boolean match = false; if (host != null) try { final Name hostName = Name.fromString(Iterables.getFirst(hostSplitter.split(host), host)); match = nameSupplier.get().contains(DomainNames.absolute(hostName)); } catch (TextParseException e) { Logs.exhaust().error("Invalid host: " + host, e); } return match; } private static class NamesSupplier implements Supplier<Set<Name>> { private final Class<?> componentClass; private NamesSupplier(final Class<?> componentClass) { this.componentClass = componentClass; } @Override public Set<Name> get() { final ComponentPart part = Ats.inClassHierarchy(componentClass).get(ComponentPart.class); final Class<? extends ComponentId> component = part == null ? null : part.value(); final Set<Name> names; if (component != null) { names = ImmutableSet.of(DomainNames.internalSubdomain(component), DomainNames.externalSubdomain(component)); } else { names = Collections.emptySet(); } return names; } } @Override public final int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((this.getName() == null) ? 0 : this.getName().hashCode()); return result; } @Override public final boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; FilteredPipeline other = (FilteredPipeline) obj; return this.compareTo(other) == 0; } @Override public String toString() { return String.format("FilteredPipeline:name=%s:hashCode=%s:class=%s", this.getName(), this.hashCode(), this.getClass().getSimpleName()); } }