/
AsyncTransactionManagerImpl.java
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/
AsyncTransactionManagerImpl.java
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/*
* Copyright 2017 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.spanner;
import com.google.api.core.ApiAsyncFunction;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutureCallback;
import com.google.api.core.ApiFutures;
import com.google.api.core.SettableApiFuture;
import com.google.cloud.Timestamp;
import com.google.cloud.spanner.SessionImpl.SessionTransaction;
import com.google.cloud.spanner.TransactionContextFutureImpl.CommittableAsyncTransactionManager;
import com.google.cloud.spanner.TransactionManager.TransactionState;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.protobuf.Empty;
import io.opencensus.trace.Span;
import io.opencensus.trace.Tracer;
import io.opencensus.trace.Tracing;
/** Implementation of {@link AsyncTransactionManager}. */
final class AsyncTransactionManagerImpl
implements CommittableAsyncTransactionManager, SessionTransaction {
private static final Tracer tracer = Tracing.getTracer();
private final SessionImpl session;
private Span span;
private final boolean inlineBegin;
private TransactionRunnerImpl.TransactionContextImpl txn;
private TransactionState txnState;
private final SettableApiFuture<Timestamp> commitTimestamp = SettableApiFuture.create();
AsyncTransactionManagerImpl(SessionImpl session, Span span, boolean inlineBegin) {
this.session = session;
this.span = span;
this.inlineBegin = inlineBegin;
}
@Override
public void setSpan(Span span) {
this.span = span;
}
@Override
public void close() {
txn.close();
}
@Override
public TransactionContextFutureImpl beginAsync() {
Preconditions.checkState(txn == null, "begin can only be called once");
TransactionContextFutureImpl begin =
new TransactionContextFutureImpl(this, internalBeginAsync(true));
return begin;
}
private ApiFuture<TransactionContext> internalBeginAsync(boolean setActive) {
txnState = TransactionState.STARTED;
txn = session.newTransaction();
if (setActive) {
session.setActive(this);
}
final SettableApiFuture<TransactionContext> res = SettableApiFuture.create();
final ApiFuture<Void> fut;
if (inlineBegin) {
fut = ApiFutures.immediateFuture(null);
} else {
fut = txn.ensureTxnAsync();
}
ApiFutures.addCallback(
fut,
new ApiFutureCallback<Void>() {
@Override
public void onFailure(Throwable t) {
res.setException(SpannerExceptionFactory.newSpannerException(t));
}
@Override
public void onSuccess(Void result) {
res.set(txn);
}
},
MoreExecutors.directExecutor());
return res;
}
@Override
public void onError(Throwable t) {
if (t instanceof AbortedException) {
txnState = TransactionState.ABORTED;
}
}
@Override
public ApiFuture<Timestamp> commitAsync() {
Preconditions.checkState(
txnState == TransactionState.STARTED,
"commit can only be invoked if the transaction is in progress. Current state: " + txnState);
if (txn.isAborted()) {
txnState = TransactionState.ABORTED;
return ApiFutures.immediateFailedFuture(
SpannerExceptionFactory.newSpannerException(
ErrorCode.ABORTED, "Transaction already aborted"));
}
ApiFuture<Timestamp> res = txn.commitAsync();
txnState = TransactionState.COMMITTED;
ApiFutures.addCallback(
res,
new ApiFutureCallback<Timestamp>() {
@Override
public void onFailure(Throwable t) {
if (t instanceof AbortedException) {
txnState = TransactionState.ABORTED;
} else {
txnState = TransactionState.COMMIT_FAILED;
commitTimestamp.setException(t);
}
}
@Override
public void onSuccess(Timestamp result) {
commitTimestamp.set(result);
}
},
MoreExecutors.directExecutor());
return res;
}
@Override
public ApiFuture<Void> rollbackAsync() {
Preconditions.checkState(
txnState == TransactionState.STARTED,
"rollback can only be called if the transaction is in progress");
try {
return ApiFutures.transformAsync(
txn.rollbackAsync(),
new ApiAsyncFunction<Empty, Void>() {
@Override
public ApiFuture<Void> apply(Empty input) throws Exception {
return ApiFutures.immediateFuture(null);
}
},
MoreExecutors.directExecutor());
} finally {
txnState = TransactionState.ROLLED_BACK;
}
}
@Override
public TransactionContextFuture resetForRetryAsync() {
if (txn == null || !txn.isAborted() && txnState != TransactionState.ABORTED) {
throw new IllegalStateException(
"resetForRetry can only be called if the previous attempt aborted");
}
return new TransactionContextFutureImpl(this, internalBeginAsync(false));
}
@Override
public TransactionState getState() {
return txnState;
}
@Override
public void invalidate() {
if (txnState == TransactionState.STARTED || txnState == null) {
txnState = TransactionState.ROLLED_BACK;
}
}
}