--- /dev/null
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed 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.argeo.jcr.proxy;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+import javax.jcr.Binary;
+import javax.jcr.Node;
+import javax.jcr.Property;
+import javax.jcr.Repository;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+import javax.jcr.nodetype.NodeType;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.ArgeoException;
+import org.argeo.jcr.JcrUtils;
+
+/** Base class for URL based proxys. */
+public abstract class AbstractUrlProxy implements ResourceProxy {
+ private final static Log log = LogFactory.getLog(AbstractUrlProxy.class);
+
+ private Repository jcrRepository;
+ private Session jcrAdminSession;
+ private String proxyWorkspace = "proxy";
+
+ protected abstract Node retrieve(Session session, String path);
+
+ void init() {
+ try {
+ jcrAdminSession = JcrUtils.loginOrCreateWorkspace(jcrRepository,
+ proxyWorkspace);
+ beforeInitSessionSave(jcrAdminSession);
+ if (jcrAdminSession.hasPendingChanges())
+ jcrAdminSession.save();
+ } catch (Exception e) {
+ JcrUtils.discardQuietly(jcrAdminSession);
+ throw new ArgeoException("Cannot initialize Maven proxy", e);
+ }
+ }
+
+ /**
+ * Called before the (admin) session is saved at the end of the
+ * initialization. Does nothing by default, to be overridden.
+ */
+ protected void beforeInitSessionSave(Session session)
+ throws RepositoryException {
+ }
+
+ void destroy() {
+ JcrUtils.logoutQuietly(jcrAdminSession);
+ }
+
+ /**
+ * Called before the (admin) session is logged out when resources are
+ * released. Does nothing by default, to be overridden.
+ */
+ protected void beforeDestroySessionLogout() throws RepositoryException {
+ }
+
+ public Node proxy(String path) {
+ // we open a JCR session with client credentials in order not to use the
+ // admin session in multiple thread or make it a bottleneck.
+ Node nodeAdmin = null;
+ Node nodeClient = null;
+ Session clientSession = null;
+ try {
+ clientSession = jcrRepository.login(proxyWorkspace);
+ if (!clientSession.itemExists(path)
+ || shouldUpdate(clientSession, path)) {
+ nodeAdmin = retrieveAndSave(path);
+ if (nodeAdmin != null)
+ nodeClient = clientSession.getNode(path);
+ } else
+ nodeClient = clientSession.getNode(path);
+ return nodeClient;
+ } catch (RepositoryException e) {
+ throw new ArgeoException("Cannot proxy " + path, e);
+ } finally {
+ if (nodeClient == null)
+ JcrUtils.logoutQuietly(clientSession);
+ }
+ }
+
+ protected synchronized Node retrieveAndSave(String path) {
+ try {
+ Node node = retrieve(jcrAdminSession, path);
+ if (node == null)
+ return null;
+ jcrAdminSession.save();
+ return node;
+ } catch (RepositoryException e) {
+ JcrUtils.discardQuietly(jcrAdminSession);
+ throw new ArgeoException("Cannot retrieve and save " + path, e);
+ } finally {
+ notifyAll();
+ }
+ }
+
+ /** Session is not saved */
+ protected synchronized Node proxyUrl(Session session, String remoteUrl,
+ String path) throws RepositoryException {
+ Node node = null;
+ if (session.itemExists(path)) {
+ // throw new ArgeoException("Node " + path + " already exists");
+ }
+ InputStream in = null;
+ try {
+ URL u = new URL(remoteUrl);
+ in = u.openStream();
+ node = importFile(session, path, in);
+ } catch (IOException e) {
+ if (log.isDebugEnabled()) {
+ log.debug("Cannot read " + remoteUrl + ", skipping... "
+ + e.getMessage());
+ // log.trace("Cannot read because of ", e);
+ }
+ JcrUtils.discardQuietly(session);
+ } finally {
+ IOUtils.closeQuietly(in);
+ }
+ return node;
+ }
+
+ protected synchronized Node importFile(Session session, String path,
+ InputStream in) throws RepositoryException {
+ Binary binary = null;
+ try {
+ Node content = null;
+ Node node = null;
+ if (!session.itemExists(path)) {
+ node = JcrUtils.mkdirs(session, path, NodeType.NT_FILE,
+ NodeType.NT_FOLDER, false);
+ content = node.addNode(Node.JCR_CONTENT, NodeType.NT_RESOURCE);
+ } else {
+ node = session.getNode(path);
+ content = node.getNode(Node.JCR_CONTENT);
+ }
+ binary = session.getValueFactory().createBinary(in);
+ content.setProperty(Property.JCR_DATA, binary);
+ JcrUtils.updateLastModifiedAndParents(node, null);
+ return node;
+ } finally {
+ JcrUtils.closeQuietly(binary);
+ }
+ }
+
+ /** Whether the file should be updated. */
+ protected Boolean shouldUpdate(Session clientSession, String nodePath) {
+ return false;
+ }
+
+ public void setJcrRepository(Repository jcrRepository) {
+ this.jcrRepository = jcrRepository;
+ }
+
+ public void setProxyWorkspace(String localWorkspace) {
+ this.proxyWorkspace = localWorkspace;
+ }
+
+}
projects / lgpl / argeo-commons.git / blobdiff