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/**
* Copyright 2010 - 2022 JetBrains s.r.o.
*
* 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
*
* https://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 jetbrains.exodus.backup;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* {@code BackupBean} is a {@linkplain Backupable} decorator of one or several {@code Backupables}.
* In an application working with an {@linkplain jetbrains.exodus.env.Environment}, using {@code BackupBean} can look
* as the following:
*
* final BackupBean backupBean = new BackupBean(environment);
* backupBean.setBackupToZip(true);
* backupBean.setBackupPath(new File(environment.getLocation(), "backups").getAbsolutePath());
* backupBean.setBackupNamePrefix(new Date().toString());
* // ...
* // ...
* // and further
* final File backup = CompressBackupUtil.backup(backupBean);
*
*
* @see Backupable
*/
public class BackupBean implements Backupable {
private static final Logger logger = LoggerFactory.getLogger(BackupBean.class);
private final Backupable[] targets;
private volatile long backupStartTicks;
private String backupPath;
private boolean backupToZip;
private String backupNamePrefix;
private String commandAfterBackup;
private final List runAfterBackup = new ArrayList<>();
private Throwable backupException;
public BackupBean(final Backupable target) {
targets = new Backupable[]{target};
}
public BackupBean(final List targets) {
final int targetsCount = targets.size();
if (targetsCount < 1) {
throw new IllegalArgumentException();
}
this.targets = targets.toArray(new Backupable[targetsCount]);
}
public void setBackupPath(@NotNull final String backupPath) {
this.backupPath = backupPath;
}
public String getBackupPath() {
return backupPath;
}
public boolean getBackupToZip() {
return backupToZip;
}
public void setBackupToZip(boolean zip) {
backupToZip = zip;
}
public String getBackupNamePrefix() {
return backupNamePrefix;
}
public void setBackupNamePrefix(String prefix) {
backupNamePrefix = prefix;
}
public void setCommandAfterBackup(@Nullable final String command) {
commandAfterBackup = command;
}
public String getCommandAfterBackup() {
return commandAfterBackup;
}
public void executeAfterBackup(@NotNull final Runnable runnable) {
runAfterBackup.add(runnable);
}
/**
* Sets time when backup started.
*
* @param backupStartTicks time when backup started, 0 if backup is finished
*/
public void setBackupStartTicks(long backupStartTicks) {
this.backupStartTicks = backupStartTicks;
}
public long getBackupStartTicks() {
return backupStartTicks;
}
public boolean isBackupInProgress() {
return backupStartTicks > 0L;
}
public void setBackupException(Throwable backupException) {
this.backupException = backupException;
}
public Throwable getBackupException() {
return backupException;
}
@NotNull
@Override
public BackupStrategy getBackupStrategy() {
final int targetsCount = targets.length;
final BackupStrategy[] wrapped = new BackupStrategy[targetsCount];
for (int i = 0; i < targetsCount; i++) {
wrapped[i] = targets[i].getBackupStrategy();
}
return new BackupStrategy() {
@Override
public void beforeBackup() throws Exception {
backupStartTicks = System.currentTimeMillis();
logger.info("Backing up database...");
for (final BackupStrategy strategy : wrapped) {
strategy.beforeBackup();
}
}
@Override
public Iterable getContents() {
return new Iterable() {
@NotNull
@Override
public Iterator iterator() {
return new Iterator() {
@Nullable
private VirtualFileDescriptor next = null;
private int i = 0;
@NotNull
private Iterator it = EMPTY.getContents().iterator();
@Override
public boolean hasNext() {
return getNext() != null;
}
@Override
public VirtualFileDescriptor next() {
try {
return getNext();
} finally {
next = null;
}
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove");
}
private VirtualFileDescriptor getNext() {
if (next == null) {
while (!it.hasNext()) {
if (i >= targetsCount) {
return next;
}
it = wrapped[i++].getContents().iterator();
}
final VirtualFileDescriptor next = it.next();
final long acceptedSize = wrapped[i - 1].acceptFile(next);
this.next = acceptedSize < next.getFileSize() ? next.copy(acceptedSize) : next;
}
return next;
}
};
}
};
}
@Override
public void afterBackup() throws Exception {
try {
for (final BackupStrategy strategy : wrapped) {
strategy.afterBackup();
}
} finally {
backupStartTicks = 0;
}
for (final Runnable runnable : runAfterBackup) {
runnable.run();
}
if (commandAfterBackup != null) {
logger.info("Executing \"" + commandAfterBackup + "\"...");
//noinspection CallToRuntimeExecWithNonConstantString,CallToRuntimeExec
Runtime.getRuntime().exec(commandAfterBackup);
}
logger.info("Backup finished.");
}
@Override
public void onError(Throwable t) {
backupException = t;
}
};
}
}