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CommitterImpl.java
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CommitterImpl.java
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/*
* Copyright 2020 Google LLC
*
* 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.google.cloud.pubsublite.internal.wire;
import static com.google.cloud.pubsublite.internal.CheckedApiPreconditions.checkState;
import static com.google.cloud.pubsublite.internal.wire.ApiServiceUtils.autoCloseableAsApiService;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;
import com.google.api.gax.rpc.ApiException;
import com.google.cloud.pubsublite.Offset;
import com.google.cloud.pubsublite.internal.CheckedApiException;
import com.google.cloud.pubsublite.internal.CloseableMonitor;
import com.google.cloud.pubsublite.internal.ProxyService;
import com.google.cloud.pubsublite.proto.InitialCommitCursorRequest;
import com.google.cloud.pubsublite.proto.SequencedCommitCursorResponse;
import com.google.cloud.pubsublite.proto.StreamingCommitCursorRequest;
import com.google.cloud.pubsublite.proto.StreamingCommitCursorResponse;
import com.google.cloud.pubsublite.v1.CursorServiceClient;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.Monitor.Guard;
import com.google.errorprone.annotations.concurrent.GuardedBy;
import java.util.Optional;
public class CommitterImpl extends ProxyService
implements Committer, RetryingConnectionObserver<SequencedCommitCursorResponse> {
private final StreamingCommitCursorRequest initialRequest;
private final CloseableMonitor monitor = new CloseableMonitor();
private final Guard isEmptyOrError =
new Guard(monitor.monitor) {
public boolean isSatisfied() {
// Wait until the state is empty or a permanent error occurred.
return state.isEmpty() || permanentError.isPresent();
}
};
@GuardedBy("monitor.monitor")
private final RetryingConnection<StreamingCommitCursorRequest, ConnectedCommitter> connection;
@GuardedBy("monitor.monitor")
private boolean shutdown = false;
@GuardedBy("monitor.monitor")
private Optional<CheckedApiException> permanentError = Optional.empty();
@GuardedBy("monitor.monitor")
private final CommitState state = new CommitState();
@VisibleForTesting
CommitterImpl(
StreamFactory<StreamingCommitCursorRequest, StreamingCommitCursorResponse> streamFactory,
ConnectedCommitterFactory factory,
InitialCommitCursorRequest initialRequest)
throws ApiException {
this.initialRequest =
StreamingCommitCursorRequest.newBuilder().setInitial(initialRequest).build();
this.connection =
new RetryingConnectionImpl<>(streamFactory, factory, this, this.initialRequest);
addServices(this.connection);
}
public CommitterImpl(CursorServiceClient client, InitialCommitCursorRequest request)
throws ApiException {
this(
stream -> client.streamingCommitCursorCallable().splitCall(stream),
new ConnectedCommitterImpl.Factory(),
request);
addServices(autoCloseableAsApiService(client));
}
// ProxyService implementation.
@Override
protected void handlePermanentError(CheckedApiException error) {
try (CloseableMonitor.Hold h = monitor.enter()) {
permanentError = Optional.of(error);
shutdown = true;
state.abort(error);
}
}
@Override
protected void stop() {
try (CloseableMonitor.Hold h = monitor.enter()) {
shutdown = true;
}
try (CloseableMonitor.Hold h = monitor.enterWhenUninterruptibly(isEmptyOrError)) {}
}
// RetryingConnectionObserver implementation.
@Override
public void triggerReinitialize(CheckedApiException streamError) {
try (CloseableMonitor.Hold h = monitor.enter()) {
connection.reinitialize(initialRequest);
Optional<Offset> offsetOr = state.reinitializeAndReturnToSend();
if (!offsetOr.isPresent()) return; // There are no outstanding commit requests.
connection.modifyConnection(
connectedCommitter -> {
Preconditions.checkArgument(connectedCommitter.isPresent());
connectedCommitter.get().commit(offsetOr.get());
});
} catch (CheckedApiException e) {
onPermanentError(e);
}
}
@Override
public void onClientResponse(SequencedCommitCursorResponse value) throws CheckedApiException {
Preconditions.checkArgument(value.getAcknowledgedCommits() > 0);
try (CloseableMonitor.Hold h = monitor.enter()) {
state.complete(value.getAcknowledgedCommits());
}
}
// Committer implementation.
@Override
public ApiFuture<Void> commitOffset(Offset offset) {
try (CloseableMonitor.Hold h = monitor.enter()) {
checkState(!shutdown, "Committed after the stream shut down.");
connection.modifyConnection(
connectedCommitter ->
connectedCommitter.ifPresent(committer -> committer.commit(offset)));
return state.addCommit(offset);
} catch (CheckedApiException e) {
onPermanentError(e);
return ApiFutures.immediateFailedFuture(e);
}
}
@Override
public void waitUntilEmpty() throws CheckedApiException {
try (CloseableMonitor.Hold h = monitor.enterWhenUninterruptibly(isEmptyOrError)) {
if (permanentError.isPresent()) {
throw permanentError.get();
}
}
}
}