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Improve EthereumListener #1152

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This PR covers issue #1138.

Adds Publisher abstraction that implements pub/sub model to deliver events from publisher to subscriber.
Replaces CompositeEthereumListener / EthereumListenerAdaptor / EthereumListener using with new event publishing mechanism.
Keeps backward compatibility with old event handling model.

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We also need to add all possible use cases of new feature in some sample. I think it's better to create a brand new sample that shows publisher features only.


@Bean
public EthereumListener ethereumListener(Publisher publisher) {
return publisher.asListener();
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I am thinking of keeping old listeners and new pub/sub scheme completely decoupled from each other. This is about stable backward compatibility, there is just much smaller chance to break something.

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In addition to stable backward compatibility we may leave such things like trace(), onPendingTransactionReceived(), onBlock(BlockSummary summary) behind

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  1. Do you mean to move backward compatibility logic from Publisher to external adapter class, to keep Publisher code clean?
  2. For each callback from EthereumListener exists similar Event type, that could be fired and caught.

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  1. I mean that it makes sense to keep both old listener which stays unchanged and a publisher. Listener will be marked as deprecated and publisher won't include already deprecated parts like onPendingTransactionReceived() method

@@ -290,14 +300,14 @@ public DbFlushManager dbFlushManager() {
}

@Bean
public BlockHeaderValidator headerValidator() {
public BlockHeaderValidator headerValidator(SystemProperties systemProperties, Publisher publisher) {
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I don't think it'll be handy in all cases.
Let's say you need to get headerValidator out of CommonConfig then you will have to make a tricky call like commonConfig.headerValidator(commonConfig.systemProperties(), commonConfig.publisher()) instead of just commonConfig.headerValidator()

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@eugene-shevchenko any thoughts on that?

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The method uses only in java config, and as I mentioned earlier such bean definition hides component dependencies. With no arguments option I should invoke three factory methods in method's body to get necessary dependencies. But if you think that no-args option is better I can revert method's signature.

PS: It's sad that java config which should configure ApplicationContext only, we use like object factory.

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I think it's not a bad thing if we want to get rid of Spring one day.
It's more deterministic way.

import java.util.NoSuchElementException;
import java.util.Set;
import java.util.Stack;
import java.util.*;
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We try to avoid wildcard import.

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Ok, I'll move back direct class import. It's just IDEA automatic import optimizer.

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Actually, it depends on configuration. You may disable wildcards in idea.

listener.trace(String.format("Block chain size: [ %d ]", this.getSize()));
publisher
.publish(new BlockAddedEvent(summary))
.publish(new BestBlockAddedEvent(summary, ret == IMPORTED_BEST))
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Basically, if we decouple old listener from publisher then BestBlockAddedEvent won't be needed at all.

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It was added for backward compatibility. The old code had default callback implementation with data proxing. So to fire such client code in a new fashion we need generate both events.
I agree, that we should leave only one event, when we'll completely remove EthereumListener.

@@ -46,6 +36,9 @@
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.*;
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See wildcard import comment above


import org.ethereum.core.BlockSummary;

public class BlockAddedEvent extends Event<BlockSummary> {
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This one and previous should be merged into a single event if we decouple new publisher from old listener

@@ -0,0 +1,4 @@
package org.ethereum.publish.event;

public class NoConnectionsEvent extends SignalEvent {
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I didn't see any calls that uses this event. Is it ever instantiated?

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Yep, it was created for correspond EthereumListener callback, before all invocations were migrated. I'll remove it.


import org.ethereum.core.BlockSummary;

public class BestBlockAddedEvent extends Event<BestBlockAddedEvent.Data> {
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I'd omit Event suffix in each class. Class names like BestBlockAdded sufficient enough to understand that instantiated object is an event.

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Can't argue with that :) I had the same idea too, cause sometimes such naming lead to worst enterprise apps class names. Will rename all events.

*
* @author Eugene Shevchenko
*/
public interface Single {
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It's better to call it OneOffEvent


import static java.util.Objects.isNull;

public class EventBus {
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Maybe it is better to move experimental stuff to a separate branch?

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I'll remove this package completely.

@coveralls
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coveralls commented Aug 14, 2018

Coverage Status

Coverage decreased (-0.07%) to 56.169% when pulling 698b59a on feature/1138-event-listener-improve into 5c808c1 on develop.

@PostConstruct
public void init() {
publisher.subscribe(to(BlockAdded.class, data -> {
data.getBlockSummary().getBlock().getTransactionsList().forEach(gasPriceTracker::onTransaction);
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this logic should be somewhere in gasPriceTracker instead

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Also, new files lacks License header.

@@ -290,14 +300,14 @@ public DbFlushManager dbFlushManager() {
}

@Bean
public BlockHeaderValidator headerValidator() {
public BlockHeaderValidator headerValidator(SystemProperties systemProperties, Publisher publisher) {
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@eugene-shevchenko any thoughts on that?

* @see Publisher
* @see Event
*/
Publisher subscribe(Subscription subscription);
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As a user I'd rather expect subscribe(Class type, Consumer handler); which is clearer. But we have to use generics though to make it really convenient:
<T> Publisher subscribe(Class<? extends Event<T>> type, Consumer<T> handler);

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I'll add two overloaded methods:

  • <T> Publisher subscribe(Class<? extends Event<T>> type, Consumer<T> handler);
  • <T> Publisher subscribe(Class<? extends Event<T>> type, BiConsumer<T, Subscription.LifeCycle> handler);
    but we need current method too, cause sometimes we are in want of Subscription instance.

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We should add some handy links where user could see available type of Events. Current user entrance could stuck without samples.

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Each of samples migrated to the new feature, so I guess it's not problem. Also we have utility class Events for convenience instantiation all of supported events. I'd rather actualize Publisher javadoc to refer user to all necessary classes.

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Before this update user was adding listener by extending EthereumListenerAdapter, he got the view of all available listening options in one click. Since this update he should write .subscribe( and what's next? Samples are not the answer, not everyone can find them and you will not go to samples every time you need to add listener, Subscription class looks difficult from the first view, events are different classes in some package somewhere, not listed in one place. So the idea is that main entrance should look handy and simplify user's usage. I'm not sure what's the best way to do it but current entrance could stuck most of users.

@Override
public void onNodeDiscovered(Node node) {
compositeListener.onNodeDiscovered(node);
publisher.publish(Events.onNodeDiscovered(node));
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Maybe use static import for Events?

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Nope, we have several methods with the same signature in both classes. That's why we should use full name in this case. In addition it's temporary class, so it's not critical I suppose.

private final List<EthereumListener> listeners;


public CompositeEthereumListener(Executor executor) {
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Why do we have anything to update in deprecated class?

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Firstly field injection is bad practice cause it hides component dependencies. But in this case it's not critical because class marked as deprecated.
I moved bean definition to java config to highlight that old and new components use the same Executor. And then both Publisher and deprecated CompositeEthereumListener injects into BackwardCompatibilityEthereumListenerProxy. IMHO it's more obvious and helps avoid dependency mess.

This also applies to the previous comment.

@@ -150,4 +160,86 @@ default void onBlock(BlockSummary blockSummary, boolean best) {
void onTransactionExecuted(TransactionExecutionSummary summary);

void onPeerAddedToSyncPool(Channel peer);

EthereumListener STUB = new EthereumListener() {
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I don't think this either necessary. Let it use old deprecated EthereumListenerAdapter

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Ok, I'll replace it with EthereumListenerAdapter

@@ -38,7 +38,7 @@
* (if {@link #getPercentileShare()} is not overridden) of the latest transactions were
* executed at this or lower price.
*/
public class RecommendedGasPriceTracker extends EthereumListenerAdapter {
public class RecommendedGasPriceTracker {
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This change breaks backward compatibility. We also need to introduce a mechanism for easy subscribing to the new publisher.

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Does anyone use this class except us? I thought that this class for our internal logic only.

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We recommend to use this class in 'official' docs:

* want to get accurate recommended gas price use {@link org.ethereum.listener.RecommendedGasPriceTracker}

If it's not pretty necessary we should preserve backward compatibility, to not force EthJ lib users to rewrite their code after each major update

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Ok, I'll revert this change.

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By the way we use this class nowhere =)

public BlockAdded(BlockSummary blockSummary, boolean best) {
super(new Data(blockSummary, best));
}
}
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new line

*
* @author Eugene Shevchenko
*/
public class LifeCycleSubscription<E extends Event<D>, D> extends Subscription<E, D> {
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I bet we don't need yet another abstraction here. Introducing it makes an API less obvious for users. I am more about to have two constructors for Subscription, one with BiConsumer, another one with Consumer that is extended to BiConsumer during construction.

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Ok, I'll move this functionality to Subscription

*/
public class LifeCycleSubscription<E extends Event<D>, D> extends Subscription<E, D> {

public static class LifeCycle {
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@eugene-shevchenko eugene-shevchenko Aug 22, 2018

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@mkalinin Sorry, I removed your comment accidentally

*/
public class LifeCycleSubscription<E extends Event<D>, D> extends Subscription<E, D> {

public static class LifeCycle {
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@eugene-shevchenko eugene-shevchenko Aug 22, 2018

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@mkalinin Sorry, I removed your comment accidentally

@ethereum ethereum deleted a comment from mkalinin Aug 22, 2018
@@ -290,14 +300,14 @@ public DbFlushManager dbFlushManager() {
}

@Bean
public BlockHeaderValidator headerValidator() {
public BlockHeaderValidator headerValidator(SystemProperties systemProperties, Publisher publisher) {
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I think it's not a bad thing if we want to get rid of Spring one day.
It's more deterministic way.

@@ -209,11 +223,6 @@ public BlockchainImpl withAdminInfo(AdminInfo adminInfo) {
return this;
}

public BlockchainImpl withEthereumListener(EthereumListener listener) {
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Listener doesn't look the thing which is required for running BlockchainImpl. Also old constructor could be used by somebody. I'd prefer to keep both old constructor (and init listener there with EthereumListener.EMPTY) and withEthereumListener method.

public void addListener(EthereumListener listener) {
logger.info("Ethereum listener added");
((CompositeEthereumListener) this.listener).addListener(listener);
((BackwardCompatibilityEthereumListenerProxy) listener).getCompositeListener().addListener(listener);
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If user have used our listener in most common way (ethereum.addListener(new EthereumListenerAdapter(){})) he will get strange exception here, I guess.

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Why do you think so ? This code fully support old logic.

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Users have code like
ethereum.addListener(new EthereumListenerAdapter());
after that it goes:
->
worldManager.addListener(listener)
->
((BackwardCompatibilityEthereumListenerProxy) EthereumListenerAdapter instance)

import org.ethereum.publish.event.message.MessageSent;
import org.ethereum.publish.event.message.PeerHandshaked;

public final class Events {
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Does this class made for internal purposes of compatibility?

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Nope, this class added for using convenience. For instance using
publisher.publish(onSyncDone(SOME_STATUS)) more readable than publisher.publish(new SyncDone(SOME_STATUS)).

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Got it

* @see Publisher
* @see Event
*/
Publisher subscribe(Subscription subscription);
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We should add some handy links where user could see available type of Events. Current user entrance could stuck without samples.

@@ -99,6 +104,10 @@ public void channelRead0(final ChannelHandlerContext ctx, EthMessage msg) throws
msgQueue.receivedMessage(msg);
}

public Publisher getPublisher() {
return ((BackwardCompatibilityEthereumListenerProxy) ethereumListener).getPublisher();
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I think BackwardCompatibilityEthereumListenerProxy should be localized somehow and don't spread to such classes.

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The main idea of BackwardCompatibilityEthereumListenerProxy is to encapsulate new and old publishing mechanisms under EthereumListener interface, and proxy old messages to both of them with / without transformation. We should use this component everywhere to reduce the number of changes and support both mechanisms at the same time.
BackwardCompatibilityEthereumListenerProxy will simplify removing deprecated logic in the future. And when the time comes we'll remove BackwardCompatibilityEthereumListenerProxy and all EthereumListener related stuff and leave only Publisher invokes.

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I got this idea as we are moving everything inside our application to the new subscribe-publish model, while leaving common user interfaces and marking them as deprecated. So any backward compatibility gateways should be localized to old public user interfaces.

}
});
// when block arrives look for our included transactions
ethereum.subscribe(to(BlockAdded.class, this::onBlock));
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I see old method usage in private void replayOnly() throws Exception
ethereum.addListener(blockReplay);

}

@Override
public void trace(String output) {
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why this kind of event was not added to publisher-subscriber implementation?

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Cause we don't want to support it anymore

@Override
public void onBlock(BlockSummary blockSummary) {
compositeListener.onBlock(blockSummary);
publisher.publish(Events.onBlockAdded(blockSummary));
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In a new pub/sub there should not be a version of onBlockAdded() which doesn't accept best class. Treat it as a deprecated feature

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Still requesting to remove Events.onBlockAdded(blockSummary) shortcut and corresponding event from new pub/sub.


public class SyncDone extends Event<SyncDone.State> implements OneOffEvent {

public enum State {
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I propose moving this enum to SyncManager class or create a standalone enum in sync package

*/
public class PendingTransactionUpdated extends Event<PendingTransactionUpdated.Data> {

public enum State {
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Let's move it to PendingTransaction class

this.subscription = subscription;
}

public void unsubscribe() {
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There is a lack of description that points to potential use cases.

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still not added :)

/**
* More convenient version of {@link #subscribe(Subscription)}
*/
<T> Publisher subscribe(Class<? extends Event<T>> type, BiConsumer<T, Subscription.LifeCycle> handler);
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I think Publisher class should also have such shortcuts

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To increase UX we may create shortcuts for event classes and put them together into one place.
For example, use Event or create new EventType class and add a list of event types definition with readable names:
public static final Class<? extends Event<BlockAdded.Data>> BLOCK_ADDED = BlockAdded.class;
Then point this type aggregation class in javadocs. It would work like an event picker then and make user choice faster, user will have to type Event. to get a list of available options

@mkalinin mkalinin modified the milestones: 1.9.0-Constantinople, 1.10.0 Oct 8, 2018
@@ -44,7 +51,7 @@

List<AbstractCachedSource<byte[], ?>> writeCaches = new CopyOnWriteArrayList<>();
List<Source<byte[], ?>> sources = new CopyOnWriteArrayList<>();
Set<DbSource> dbSources = new HashSet<>();
Set<DbSource> dbSources ;
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As for me there is no reason for this change.

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I'll revert this change

gLogger.info("EthereumJ node started: enode://" + toHexString(config.nodeId()) + "@" + config.externalIp() + ":" + config.listenPort());
}

@PostConstruct
public void init() {
worldManager.subscribe(to(BLOCK_ADED, data -> gasPriceTracker.onBlock(data.getBlockSummary())));
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BLOCK_ADED => BLOCK_ADDED

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I'll fix it

}

@Override
public void trace(String output) {
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Cause we don't want to support it anymore

@Override
public void onBlock(BlockSummary blockSummary) {
compositeListener.onBlock(blockSummary);
publisher.publish(Events.onBlockAdded(blockSummary));
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Still requesting to remove Events.onBlockAdded(blockSummary) shortcut and corresponding event from new pub/sub.

* <p>
* Created by Eugene Shevchenko on 07.10.2018.
*/
public class BlockReplayer {
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Should we mark its predecessor BlockReplay class as a deprecated one?

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yep, I'll add comment.

this.subscription = subscription;
}

public void unsubscribe() {
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still not added :)

@mkalinin mkalinin modified the milestones: 1.10.0, 1.11.0 Jan 11, 2019
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