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https://code.briarproject.org/briar/briar.git
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Initial commit with new directory structure.
This commit is contained in:
akwizgran
381
components/net/sf/briar/db/SynchronizedDatabaseComponent.java
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381
components/net/sf/briar/db/SynchronizedDatabaseComponent.java
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package net.sf.briar.db;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Set;
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import com.google.inject.Inject;
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import com.google.inject.Provider;
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import net.sf.briar.api.db.DbException;
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import net.sf.briar.api.db.NeighbourId;
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import net.sf.briar.api.db.Rating;
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import net.sf.briar.api.db.Status;
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import net.sf.briar.api.protocol.AuthorId;
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import net.sf.briar.api.protocol.Batch;
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import net.sf.briar.api.protocol.BatchId;
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import net.sf.briar.api.protocol.Bundle;
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import net.sf.briar.api.protocol.GroupId;
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import net.sf.briar.api.protocol.Message;
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import net.sf.briar.api.protocol.MessageId;
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class SynchronizedDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
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/*
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* Locks must always be acquired in alphabetical order. See the Database
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* interface to find out which calls require which locks.
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*/
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private final Object messageLock = new Object();
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private final Object neighbourLock = new Object();
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private final Object ratingLock = new Object();
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private final Object subscriptionLock = new Object();
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@Inject
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SynchronizedDatabaseComponent(Database<Txn> db,
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Provider<Batch> batchProvider) {
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super(db, batchProvider);
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}
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protected void expireMessages(long size) throws DbException {
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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Txn txn = db.startTransaction("cleaner");
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try {
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for(MessageId m : db.getOldMessages(txn, size)) {
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removeMessage(txn, m);
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}
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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}
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public void close() throws DbException {
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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synchronized(ratingLock) {
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synchronized(subscriptionLock) {
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db.close();
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}
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}
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}
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}
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}
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public void addNeighbour(NeighbourId n) throws DbException {
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System.out.println("Adding neighbour " + n);
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synchronized(neighbourLock) {
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Txn txn = db.startTransaction("addNeighbour");
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try {
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db.addNeighbour(txn, n);
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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public void addLocallyGeneratedMessage(Message m) throws DbException {
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waitForPermissionToWrite();
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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synchronized(subscriptionLock) {
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Txn txn = db.startTransaction("addLocallyGeneratedMessage");
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try {
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if(db.containsSubscription(txn, m.getGroup())) {
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boolean added = storeMessage(txn, m, null);
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assert added;
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} else {
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System.out.println("Not subscribed");
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}
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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}
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}
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public Rating getRating(AuthorId a) throws DbException {
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synchronized(ratingLock) {
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Txn txn = db.startTransaction("getRating");
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try {
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Rating r = db.getRating(txn, a);
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db.commitTransaction(txn);
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return r;
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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public void setRating(AuthorId a, Rating r) throws DbException {
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synchronized(messageLock) {
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synchronized(ratingLock) {
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Txn txn = db.startTransaction("setRating");
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try {
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Rating old = db.setRating(txn, a, r);
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// Update the sendability of the author's messages
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if(r == Rating.GOOD && old != Rating.GOOD)
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updateAuthorSendability(txn, a, true);
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else if(r != Rating.GOOD && old == Rating.GOOD)
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updateAuthorSendability(txn, a, false);
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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}
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public Set<GroupId> getSubscriptions() throws DbException {
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synchronized(subscriptionLock) {
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Txn txn = db.startTransaction("getSubscriptions");
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try {
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HashSet<GroupId> subs = new HashSet<GroupId>();
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for(GroupId g : db.getSubscriptions(txn)) subs.add(g);
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db.commitTransaction(txn);
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return subs;
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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public void subscribe(GroupId g) throws DbException {
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System.out.println("Subscribing to " + g);
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synchronized(subscriptionLock) {
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Txn txn = db.startTransaction("subscribe");
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try {
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db.addSubscription(txn, g);
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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public void unsubscribe(GroupId g) throws DbException {
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System.out.println("Unsubscribing from " + g);
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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synchronized(subscriptionLock) {
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Txn txn = db.startTransaction("unsubscribe");
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try {
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db.removeSubscription(txn, g);
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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}
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}
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public void generateBundle(NeighbourId n, Bundle b) throws DbException {
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System.out.println("Generating bundle for " + n);
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// Ack all batches received from the neighbour
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synchronized(neighbourLock) {
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Txn txn = db.startTransaction("generateBundle:acks");
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try {
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int numAcks = 0;
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for(BatchId ack : db.removeBatchesToAck(txn, n)) {
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b.addAck(ack);
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numAcks++;
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}
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System.out.println("Added " + numAcks + " acks");
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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// Add a list of subscriptions
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synchronized(subscriptionLock) {
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Txn txn = db.startTransaction("generateBundle:subscriptions");
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try {
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int numSubs = 0;
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for(GroupId g : db.getSubscriptions(txn)) {
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b.addSubscription(g);
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numSubs++;
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}
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System.out.println("Added " + numSubs + " subscriptions");
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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// Add as many messages as possible to the bundle
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long capacity = b.getCapacity();
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while(true) {
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Batch batch = fillBatch(n, capacity);
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if(batch == null) break; // No more messages to send
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b.addBatch(batch);
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capacity -= batch.getSize();
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// If the batch is less than half full, stop trying - there may be
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// more messages trickling in but we can't wait forever
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if(batch.getSize() * 2 < Batch.CAPACITY) break;
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}
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b.seal();
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System.out.println("Bundle sent, " + b.getSize() + " bytes");
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System.gc();
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}
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private Batch fillBatch(NeighbourId n, long capacity) throws DbException {
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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Txn txn = db.startTransaction("fillBatch");
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try {
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capacity = Math.min(capacity, Batch.CAPACITY);
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Iterator<MessageId> it =
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db.getSendableMessages(txn, n, capacity).iterator();
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if(!it.hasNext()) {
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db.commitTransaction(txn);
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return null; // No more messages to send
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}
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Batch b = batchProvider.get();
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Set<MessageId> sent = new HashSet<MessageId>();
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while(it.hasNext()) {
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MessageId m = it.next();
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b.addMessage(db.getMessage(txn, m));
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sent.add(m);
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}
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b.seal();
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// Record the contents of the batch
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assert !sent.isEmpty();
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db.addOutstandingBatch(txn, n, b.getId(), sent);
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db.commitTransaction(txn);
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return b;
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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}
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public void receiveBundle(NeighbourId n, Bundle b) throws DbException {
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System.out.println("Received bundle from " + n + ", "
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+ b.getSize() + " bytes");
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// Mark all messages in acked batches as seen
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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int acks = 0, expired = 0;
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for(BatchId ack : b.getAcks()) {
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acks++;
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Txn txn = db.startTransaction("receiveBundle:acks");
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try {
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Iterable<MessageId> batch =
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db.removeOutstandingBatch(txn, n, ack);
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// May be null if the batch was empty or has expired
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if(batch == null) {
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expired++;
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} else {
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for(MessageId m : batch) {
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// Don't re-create statuses for expired messages
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if(db.containsMessage(txn, m))
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db.setStatus(txn, n, m, Status.SEEN);
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}
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}
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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System.out.println("Received " + acks + " acks, " + expired
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+ " expired");
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}
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}
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// Update the neighbour's subscriptions
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synchronized(neighbourLock) {
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Txn txn = db.startTransaction("receiveBundle:subscriptions");
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try {
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db.clearSubscriptions(txn, n);
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int subs = 0;
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for(GroupId g : b.getSubscriptions()) {
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subs++;
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db.addSubscription(txn, n, g);
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}
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System.out.println("Received " + subs + " subscriptions");
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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// Store the messages
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int batches = 0;
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for(Batch batch : b.getBatches()) {
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batches++;
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waitForPermissionToWrite();
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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synchronized(subscriptionLock) {
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Txn txn = db.startTransaction("receiveBundle:batch");
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try {
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int received = 0, stored = 0;
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for(Message m : batch.getMessages()) {
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received++;
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if(db.containsSubscription(txn, m.getGroup())) {
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if(storeMessage(txn, m, n)) stored++;
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}
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}
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System.out.println("Received " + received
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+ " messages, stored " + stored);
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db.addBatchToAck(txn, n, batch.getId());
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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}
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}
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System.out.println("Received " + batches + " batches");
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// Find any lost batches that need to be retransmitted
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Set<BatchId> lost;
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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Txn txn = db.startTransaction("receiveBundle:findLost");
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try {
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lost = db.addReceivedBundle(txn, n, b.getId());
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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for(BatchId batch : lost) {
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synchronized(messageLock) {
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synchronized(neighbourLock) {
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Txn txn = db.startTransaction("receiveBundle:removeLost");
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try {
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System.out.println("Removing lost batch");
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db.removeLostBatch(txn, n, batch);
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db.commitTransaction(txn);
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} catch(DbException e) {
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db.abortTransaction(txn);
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throw e;
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}
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}
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}
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}
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System.gc();
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}
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}
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