/
StoreCopier.java
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/
StoreCopier.java
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/*
* Copyright 2013 Marc Nuri San Felix
*
* 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 com.marcnuri.mnimapsync.store;
import static com.marcnuri.mnimapsync.imap.IMAPUtils.sourceFolderNameToTarget;
import com.marcnuri.mnimapsync.MNIMAPSync;
import com.marcnuri.mnimapsync.index.Index;
import com.sun.mail.imap.IMAPFolder;
import com.sun.mail.imap.IMAPStore;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.mail.Folder;
import javax.mail.MessagingException;
import javax.mail.ReadOnlyFolderException;
/**
*
* @author Marc Nuri <marc@marcnuri.com>
*/
public final class StoreCopier {
private final ExecutorService service;
private final IMAPStore sourceStore;
private final IMAPStore targetStore;
private final Index sourceIndex;
private final Index targetIndex;
private final AtomicInteger foldersCopiedCount;
private final AtomicInteger foldersSkippedCount;
private final AtomicLong messagesCopiedCount;
private final AtomicLong messagesSkippedCount;
//If no empty, we shouldn't allow deletion
private final List<MessagingException> copyExceptions;
public StoreCopier(IMAPStore sourceStore, Index sourceIndex, IMAPStore targetStore,
Index targetIndex, int threads) {
this.sourceStore = sourceStore;
this.sourceIndex = sourceIndex;
this.targetStore = targetStore;
this.targetIndex = targetIndex;
service = Executors.newFixedThreadPool(threads);
foldersCopiedCount = new AtomicInteger();
foldersSkippedCount = new AtomicInteger();
messagesCopiedCount = new AtomicLong();
messagesSkippedCount = new AtomicLong();
this.copyExceptions = Collections.synchronizedList(new ArrayList<>());
}
public final void copy() throws InterruptedException {
try {
sourceIndex
.setFolderSeparator(String.valueOf(sourceStore.getDefaultFolder().getSeparator()));
//Copy Folder Structure
copySourceFolder(sourceStore.getDefaultFolder());
//Copy messages
copySourceMessages((IMAPFolder) sourceStore.getDefaultFolder());
} catch (MessagingException ex) {
Logger.getLogger(StoreCopier.class.getName()).log(Level.SEVERE, null, ex);
}
service.shutdown();
service.awaitTermination(1, TimeUnit.DAYS);
}
/**
* Create folders in the target server recursively from the source.
*
* It also indexes the source store folders if we want to delete target folders that no longer
* exist
*/
private void copySourceFolder(Folder folder) throws MessagingException {
final String sourceFolderName = folder.getFullName();
final String targetFolderName = sourceFolderNameToTarget(sourceFolderName, sourceIndex,
targetIndex);
//Index for delete after copy (if necessary)
if (sourceIndex != null) {
sourceIndex.addFolder(sourceFolderName);
}
//Copy folder
if (!targetIndex.containsFolder(targetFolderName)) {
if (!targetStore.getFolder(targetFolderName).create(folder.getType())) {
throw new MessagingException(String.format(
"Couldn't create folder: %s in target server.", sourceFolderName));
}
incrementFoldersCopiedCount();
} else {
incrementFoldersSkippedCount();
}
//Folder recursion. Get all children
if ((folder.getType() & Folder.HOLDS_FOLDERS) == Folder.HOLDS_FOLDERS) {
for (Folder child : folder.list()) {
copySourceFolder(child);
}
}
}
/**
* Once the folder structure has been created it copies messages recursively from the root
* folder.
*/
private void copySourceMessages(IMAPFolder sourceFolder) throws MessagingException {
if (sourceFolder != null) {
final String sourceFolderName = sourceFolder.getFullName();
final String targetFolderName = sourceFolderNameToTarget(sourceFolderName, sourceIndex,
targetIndex);
if ((sourceFolder.getType() & Folder.HOLDS_MESSAGES) == Folder.HOLDS_MESSAGES) {
//Manage Servers with public/read only folders.
try {
sourceFolder.open(Folder.READ_WRITE);
} catch (ReadOnlyFolderException ex) {
sourceFolder.open(Folder.READ_ONLY);
}
if (sourceFolder.getMode() != Folder.READ_ONLY) {
sourceFolder.expunge();
}
///////////////////////
final int messageCount = sourceFolder.getMessageCount();
sourceFolder.close(false);
int pos = 1;
while (pos + MNIMAPSync.BATCH_SIZE <= messageCount) {
//Copy messages
service.execute(new MessageCopier(this, sourceFolderName, targetFolderName, pos,
pos + MNIMAPSync.BATCH_SIZE, targetIndex.getFolderMessages(
targetFolderName)));
pos = pos + MNIMAPSync.BATCH_SIZE;
}
service.execute(new MessageCopier(this, sourceFolderName, targetFolderName, pos,
messageCount,
targetIndex.getFolderMessages(targetFolderName)));
}
//Folder recursion. Get all children
if ((sourceFolder.getType() & Folder.HOLDS_FOLDERS) == Folder.HOLDS_FOLDERS) {
for (Folder child : sourceFolder.list()) {
copySourceMessages((IMAPFolder) child);
}
}
}
}
public final boolean hasCopyException() {
synchronized (copyExceptions) {
return !copyExceptions.isEmpty();
}
}
private void incrementFoldersCopiedCount() {
foldersCopiedCount.getAndAdd(1);
}
private void incrementFoldersSkippedCount() {
foldersSkippedCount.getAndAdd(1);
}
protected final void updatedMessagesCopiedCount(long delta) {
messagesCopiedCount.getAndAdd(delta);
}
protected final void updateMessagesSkippedCount(long delta) {
messagesSkippedCount.getAndAdd(delta);
}
public final int getFoldersCopiedCount() {
return foldersCopiedCount.get();
}
public final int getFoldersSkippedCount() {
return foldersSkippedCount.get();
}
public final long getMessagesCopiedCount() {
return messagesCopiedCount.get();
}
public final long getMessagesSkippedCount() {
return messagesSkippedCount.get();
}
final IMAPStore getSourceStore() {
return sourceStore;
}
final Index getSourceIndex() {
return sourceIndex;
}
final IMAPStore getTargetStore() {
return targetStore;
}
public final synchronized List<MessagingException> getCopyExceptions() {
return copyExceptions;
}
}