Introduce org.argeo.maintenance

[lgpl/argeo-commons.git] / org.argeo.maintenance / src / org / argeo / maintenance / backup / vfs / AbstractAtomicBackup.java

diff --git a/org.argeo.maintenance/src/org/argeo/maintenance/backup/vfs/AbstractAtomicBackup.java b/org.argeo.maintenance/src/org/argeo/maintenance/backup/vfs/AbstractAtomicBackup.java
new file mode 100644 (file)
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+/*
+ * 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.maintenance.backup.vfs;
+
+import org.apache.commons.vfs2.FileObject;
+import org.apache.commons.vfs2.FileSystemManager;
+import org.apache.commons.vfs2.FileSystemOptions;
+import org.apache.commons.vfs2.provider.sftp.SftpFileSystemConfigBuilder;
+import org.argeo.maintenance.MaintenanceException;
+
+/**
+ * Simplify atomic backups implementation, especially by managing VFS.
+ */
+public abstract class AbstractAtomicBackup implements AtomicBackup {
+       private String name;
+       private String compression = "bz2";
+
+       protected abstract void writeBackup(FileObject targetFo);
+
+       public AbstractAtomicBackup() {
+       }
+
+       public AbstractAtomicBackup(String name) {
+               this.name = name;
+       }
+
+       public void init() {
+               if (name == null)
+                       throw new MaintenanceException("Atomic backup name must be set");
+       }
+
+       public void destroy() {
+
+       }
+
+       @Override
+       public String backup(FileSystemManager fileSystemManager,
+                       String backupsBase, BackupContext backupContext,
+                       FileSystemOptions opts) {
+               if (name == null)
+                       throw new MaintenanceException("Atomic backup name must be set");
+
+               FileObject targetFo = null;
+               try {
+                       if (backupsBase.startsWith("sftp:"))
+                               SftpFileSystemConfigBuilder.getInstance()
+                                               .setStrictHostKeyChecking(opts, "no");
+                       if (compression == null || compression.equals("none"))
+                               targetFo = fileSystemManager.resolveFile(backupsBase + '/'
+                                               + backupContext.getRelativeFolder() + '/' + name, opts);
+                       else if (compression.equals("bz2"))
+                               targetFo = fileSystemManager.resolveFile("bz2:" + backupsBase
+                                               + '/' + backupContext.getRelativeFolder() + '/' + name
+                                               + ".bz2" + "!" + name, opts);
+                       else if (compression.equals("gz"))
+                               targetFo = fileSystemManager.resolveFile("gz:" + backupsBase
+                                               + '/' + backupContext.getRelativeFolder() + '/' + name
+                                               + ".gz" + "!" + name, opts);
+                       else
+                               throw new MaintenanceException("Unsupported compression "
+                                               + compression);
+
+                       writeBackup(targetFo);
+
+                       return targetFo.toString();
+               } catch (Exception e) {
+                       throw new MaintenanceException("Cannot backup " + name + " to "
+                                       + targetFo, e);
+               } finally {
+                       BackupUtils.closeFOQuietly(targetFo);
+               }
+       }
+
+       public void setName(String name) {
+               this.name = name;
+       }
+
+       public String getName() {
+               return name;
+       }
+
+       public void setCompression(String compression) {
+               this.compression = compression;
+       }
+}