session-android/src/org/thoughtcrime/securesms/service/ExpiringMessageManager.java

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package org.thoughtcrime.securesms.service;
import android.content.Context;
import android.util.Log;
import org.thoughtcrime.securesms.database.DatabaseFactory;
import org.thoughtcrime.securesms.database.MmsDatabase;
import org.thoughtcrime.securesms.database.SmsDatabase;
import org.thoughtcrime.securesms.database.model.MessageRecord;
import java.util.Comparator;
import java.util.TreeSet;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
public class ExpiringMessageManager {
private static final String TAG = ExpiringMessageManager.class.getSimpleName();
private final TreeSet<ExpiringMessageReference> expiringMessageReferences = new TreeSet<>(new ExpiringMessageComparator());
private final Executor executor = Executors.newSingleThreadExecutor();
private final SmsDatabase smsDatabase;
private final MmsDatabase mmsDatabase;
private final Context context;
public ExpiringMessageManager(Context context) {
this.context = context.getApplicationContext();
this.smsDatabase = DatabaseFactory.getSmsDatabase(context);
this.mmsDatabase = DatabaseFactory.getMmsDatabase(context);
executor.execute(new LoadTask());
executor.execute(new ProcessTask());
}
public void scheduleDeletion(long id, boolean mms, long expiresInMillis) {
scheduleDeletion(id, mms, System.currentTimeMillis(), expiresInMillis);
}
public void scheduleDeletion(long id, boolean mms, long startedAtTimestamp, long expiresInMillis) {
long expiresAtMillis = startedAtTimestamp + expiresInMillis;
synchronized (expiringMessageReferences) {
expiringMessageReferences.add(new ExpiringMessageReference(id, mms, expiresAtMillis));
expiringMessageReferences.notifyAll();
}
}
public void checkSchedule() {
synchronized (expiringMessageReferences) {
expiringMessageReferences.notifyAll();
}
}
private class LoadTask implements Runnable {
public void run() {
SmsDatabase.Reader smsReader = smsDatabase.readerFor(smsDatabase.getExpirationStartedMessages());
MmsDatabase.Reader mmsReader = mmsDatabase.getExpireStartedMessages(null);
MessageRecord messageRecord = null;
while ((messageRecord = smsReader.getNext()) != null) {
expiringMessageReferences.add(new ExpiringMessageReference(messageRecord.getId(),
messageRecord.isMms(),
messageRecord.getExpireStarted() + messageRecord.getExpiresIn()));
}
while ((messageRecord = mmsReader.getNext()) != null) {
expiringMessageReferences.add(new ExpiringMessageReference(messageRecord.getId(),
messageRecord.isMms(),
messageRecord.getExpireStarted() + messageRecord.getExpiresIn()));
}
}
}
private class ProcessTask implements Runnable {
public void run() {
while (true) {
ExpiringMessageReference expiredMessage = null;
synchronized (expiringMessageReferences) {
try {
while (expiringMessageReferences.isEmpty()) expiringMessageReferences.wait();
ExpiringMessageReference nextReference = expiringMessageReferences.first();
long waitTime = nextReference.expiresAtMillis - System.currentTimeMillis();
if (waitTime > 0) {
ExpirationListener.setAlarm(context, waitTime);
expiringMessageReferences.wait(waitTime);
} else {
expiredMessage = nextReference;
expiringMessageReferences.remove(nextReference);
}
} catch (InterruptedException e) {
Log.w(TAG, e);
}
}
if (expiredMessage != null) {
if (expiredMessage.mms) mmsDatabase.delete(expiredMessage.id);
else smsDatabase.deleteMessage(expiredMessage.id);
}
}
}
}
private static class ExpiringMessageReference {
private final long id;
private final boolean mms;
private final long expiresAtMillis;
private ExpiringMessageReference(long id, boolean mms, long expiresAtMillis) {
this.id = id;
this.mms = mms;
this.expiresAtMillis = expiresAtMillis;
}
@Override
public boolean equals(Object other) {
if (other == null) return false;
if (!(other instanceof ExpiringMessageReference)) return false;
ExpiringMessageReference that = (ExpiringMessageReference)other;
return this.id == that.id && this.mms == that.mms && this.expiresAtMillis == that.expiresAtMillis;
}
@Override
public int hashCode() {
return (int)this.id ^ (mms ? 1 : 0) ^ (int)expiresAtMillis;
}
}
private static class ExpiringMessageComparator implements Comparator<ExpiringMessageReference> {
@Override
public int compare(ExpiringMessageReference lhs, ExpiringMessageReference rhs) {
if (lhs.expiresAtMillis < rhs.expiresAtMillis) return -1;
else if (lhs.expiresAtMillis > rhs.expiresAtMillis) return 1;
else if (lhs.id < rhs.id) return -1;
else if (lhs.id > rhs.id) return 1;
else if (!lhs.mms && rhs.mms) return -1;
else if (lhs.mms && !rhs.mms) return 1;
else return 0;
}
}
}