/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.management.client.content;
import static org.jboss.as.controller.ControllerMessages.MESSAGES;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.jboss.as.controller.HashUtil;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
import org.jboss.as.controller.registry.Resource;
import org.jboss.as.repository.ContentRepository;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.Property;
import org.jboss.vfs.VirtualFile;
/**
* {@link Resource} implementation for the root resource of a tree of resources that store managed DMR content
* (e.g. named rollout plans.)
*
* @author Brian Stansberry (c) 2011 Red Hat Inc.
*/
public class ManagedDMRContentTypeResource implements Resource.ResourceEntry {
private final PathElement pathElement;
private final String childType;
private final ContentRepository contentRepository;
private final Map<String, ManagedContent> content = new HashMap<String, ManagedContent>();
private final ModelNode model = new ModelNode();
private final MessageDigest messageDigest;
public ManagedDMRContentTypeResource(final PathElement pathElement, final String childType,
final byte[] initialHash, final ContentRepository contentRepository) {
this.pathElement = pathElement;
this.childType = childType;
this.contentRepository = contentRepository;
try {
this.messageDigest = MessageDigest.getInstance("SHA-1");
} catch (NoSuchAlgorithmException e) {
throw ManagedDMRContentMessages.MESSAGES.messageDigestAlgorithmNotAvailable(e);
}
// Establish an initial hash attribute
model.get(ModelDescriptionConstants.HASH);
if (initialHash != null) {
loadContent(initialHash);
} // else leave attribute undefined
}
private ManagedDMRContentTypeResource(final ManagedDMRContentTypeResource toCopy) {
this.pathElement = toCopy.pathElement;
this.childType = toCopy.childType;
this.contentRepository = toCopy.contentRepository;
this.messageDigest = toCopy.messageDigest;
synchronized (toCopy.content) {
for (Map.Entry<String, ManagedContent> entry : toCopy.content.entrySet()) {
ManagedContent value = entry.getValue();
this.content.put(entry.getKey(), new ManagedContent(value.getContent(), value.getHash()));
}
}
this.model.set(toCopy.model);
}
@Override
public ModelNode getModel() {
return model.clone();
}
@Override
public void writeModel(ModelNode newModel) {
if (model.hasDefined(ModelDescriptionConstants.HASH)) {
throw MESSAGES.immutableResource();
} else {
// ApplyRemoteMasterDomainModelHandler is writing us
byte[] initialHash = newModel.hasDefined(ModelDescriptionConstants.HASH) ? newModel.get(ModelDescriptionConstants.HASH).asBytes() : null;
if (initialHash != null) {
loadContent(initialHash);
}
}
}
@Override
public boolean isModelDefined() {
return true;
}
@Override
public Resource getChild(PathElement element) {
if (hasChildren(element.getKey())) {
synchronized (content) {
String name = element.getValue();
ManagedContent managedContent = content.get(name);
if (managedContent != null) {
return getChildEntry(name);
}
}
}
return null;
}
@Override
public Resource requireChild(PathElement address) {
final Resource resource = getChild(address);
if (resource == null) {
throw new NoSuchResourceException(address);
}
return resource;
}
@Override
public Resource navigate(PathAddress address) {
if (address.size() == 0) {
return this;
} else {
Resource child = requireChild(address.getElement(0));
return address.size() == 1 ? child : child.navigate(address.subAddress(1));
}
}
@Override
public Set<String> getChildTypes() {
return Collections.singleton(childType);
}
@Override
public Set<Resource.ResourceEntry> getChildren(String childType) {
if (!hasChildren(childType)) {
return Collections.emptySet();
} else {
Set<Resource.ResourceEntry> result = new HashSet<ResourceEntry>();
synchronized (content) {
for (String name : content.keySet()) {
result.add(getChildEntry(name));
}
}
return result;
}
}
@Override
public final boolean hasChildren(String childType) {
return this.childType.equals(childType);
}
@Override
public boolean hasChild(PathElement element) {
return getChildrenNames(element.getKey()).contains(element.getValue());
}
@Override
public Set<String> getChildrenNames(String childType) {
if (hasChildren(childType)) {
synchronized (content) {
return new HashSet<String>(content.keySet());
}
} else {
return Collections.emptySet();
}
}
@Override
public void registerChild(PathElement address, Resource resource) {
if (!childType.equals(address.getKey())) {
throw ManagedDMRContentMessages.MESSAGES.illegalChildType(address.getKey(), childType);
}
if (! (resource instanceof ManagedDMRContentResource)) {
throw ManagedDMRContentMessages.MESSAGES.illegalChildClass(resource.getClass());
}
// Just attach ourself to this child so during the course of this operation it can access data
ManagedDMRContentResource child = ManagedDMRContentResource.class.cast(resource);
child.setParent(this);
}
@Override
public Resource removeChild(PathElement address) {
final Resource toRemove = getChild(address);
if (toRemove != null) {
synchronized (content) {
content.remove(address.getValue());
}
try{
storeContent();
} catch (IOException e) {
throw new ContentStorageException(e);
}
}
return toRemove;
}
@Override
public boolean isRuntime() {
return false;
}
@Override
public boolean isProxy() {
return false;
}
@SuppressWarnings({"CloneDoesntCallSuperClone"})
@Override
public Resource clone() {
return new ManagedDMRContentTypeResource(this);
}
@Override
public String getName() {
return this.pathElement.getValue();
}
@Override
public PathElement getPathElement() {
return this.pathElement;
}
ManagedContent getManagedContent(final String name) {
return content.get(name);
}
byte[] storeManagedContent(final String name, final ModelNode content) throws IOException {
final byte[] hash = hashContent(content);
synchronized (this.content) {
this.content.put(name, new ManagedContent(content, hash));
}
storeContent();
return hash;
}
private void loadContent(byte[] initialHash) {
VirtualFile vf = contentRepository.getContent(initialHash);
if (vf == null) {
throw ManagedDMRContentMessages.MESSAGES.noContentFoundWithHash(HashUtil.bytesToHexString(initialHash));
}
InputStream is = null;
try {
is = vf.openStream();
ModelNode node = ModelNode.fromStream(is);
if (node.isDefined()) {
for (Property prop : node.asPropertyList()) {
ModelNode value = prop.getValue();
byte[] hash = hashContent(value);
synchronized (content) {
content.put(prop.getName(), new ManagedContent(value, hash));
}
}
}
this.model.get(ModelDescriptionConstants.HASH).set(initialHash);
} catch (IOException e) {
throw new ContentStorageException(e);
} finally {
safeClose(is);
}
}
private void storeContent() throws IOException {
final ModelNode node = new ModelNode();
boolean hasContent;
synchronized (content) {
hasContent = !content.isEmpty();
if (hasContent) {
for (Map.Entry<String, ManagedContent> entry : content.entrySet()) {
node.get(entry.getKey()).set(entry.getValue().content);
}
}
}
if (hasContent) {
ByteArrayInputStream bais = new ByteArrayInputStream(node.toString().getBytes());
byte[] ourHash = contentRepository.addContent(bais);
this.model.get(ModelDescriptionConstants.HASH).set(ourHash);
} else {
this.model.get(ModelDescriptionConstants.HASH).clear();
}
}
private byte[] hashContent(ModelNode content) throws IOException {
byte[] sha1Bytes;
OutputStream os = new OutputStream() {
@Override
public void write(int b) throws IOException {
// just discard
}
};
synchronized (messageDigest) {
messageDigest.reset();
DigestOutputStream dos = new DigestOutputStream(os, messageDigest);
ByteArrayInputStream bis = new ByteArrayInputStream(content.toString().getBytes());
byte[] bytes = new byte[8192];
int read;
while ((read = bis.read(bytes)) > -1) {
dos.write(bytes, 0, read);
}
sha1Bytes = messageDigest.digest();
}
return sha1Bytes;
}
private ResourceEntry getChildEntry(String name) {
return new ManagedDMRContentResource(PathElement.pathElement(childType, name) ,this);
}
private static void safeClose(Closeable c) {
if (c != null) {
try {
c.close();
} catch (IOException e) {
// ignore
}
}
}
static class ManagedContent {
private final ModelNode content;
private final byte[] hash;
ManagedContent(ModelNode content, byte[] hash) {
this.content = content;
this.hash = hash;
}
ModelNode getContent() {
return content.clone();
}
byte[] getHash() {
return Arrays.copyOf(hash, hash.length);
}
}
}