package org.jdbi.v3.core.transaction;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import org.jdbi.v3.core.Handle;
import org.jdbi.v3.core.HandleCallback;
import org.jdbi.v3.core.internal.exceptions.Unchecked;
public class LocalTransactionHandler implements TransactionHandler {
private final Map<Handle, BoundLocalTransactionHandler> bound = Collections.synchronizedMap(new WeakHashMap<>());
@Override
public void begin(Handle handle) {
nonspecial(handle).begin(handle);
}
@Override
public void commit(Handle handle) {
nonspecial(handle).commit(handle);
}
@Override
public void rollback(Handle handle) {
nonspecial(handle).rollback(handle);
}
@Override
public boolean isInTransaction(Handle handle) {
return nonspecial(handle).isInTransaction(handle);
}
@Override
public void savepoint(Handle handle, String savepointName) {
nonspecial(handle).savepoint(handle, savepointName);
}
@Override
public void rollbackToSavepoint(Handle handle, String savepointName) {
nonspecial(handle).rollbackToSavepoint(handle, savepointName);
}
@Override
public void releaseSavepoint(Handle handle, String savepointName) {
nonspecial(handle).releaseSavepoint(handle, savepointName);
}
@Override
public <R, X extends Exception> R inTransaction(Handle handle, HandleCallback<R, X> callback) throws X {
return nonspecial(handle).inTransaction(handle, callback);
}
@Override
public <R, X extends Exception> R inTransaction(Handle handle, TransactionIsolationLevel level, HandleCallback<R, X> callback) throws X {
return nonspecial(handle).inTransaction(handle, level, callback);
}
TransactionHandler nonspecial(Handle handle) {
return bound.computeIfAbsent(handle, Unchecked.function(BoundLocalTransactionHandler::new));
}
public static LocalTransactionHandler binding() {
return new BindingLocalTransactionHandler();
}
static class BindingLocalTransactionHandler extends LocalTransactionHandler {
@Override
public TransactionHandler specialize(Handle handle) throws SQLException {
return new BoundLocalTransactionHandler(handle);
}
}
static class BoundLocalTransactionHandler implements TransactionHandler {
private final Map<String, Savepoint> savepoints = new HashMap<>();
private boolean initialAutocommit;
private boolean didBegin;
private boolean didTxnRollback;
BoundLocalTransactionHandler(Handle handle) throws SQLException {
this.initialAutocommit = handle.getConnection().getAutoCommit();
}
@Override
public void begin(Handle handle) {
try {
if (!didBegin) {
Connection conn = handle.getConnection();
initialAutocommit = conn.getAutoCommit();
didTxnRollback = false;
savepoints.clear();
conn.setAutoCommit(false);
didBegin = true;
}
} catch (SQLException e) {
throw new TransactionException("Failed to start transaction", e);
}
}
@Override
public void commit(Handle handle) {
try {
handle.getConnection().commit();
} catch (SQLException e) {
throw new TransactionException("Failed to commit transaction", e);
} finally {
restoreAutoCommitState(handle);
}
}
@Override
public void rollback(Handle handle) {
didTxnRollback = true;
try {
handle.getConnection().rollback();
} catch (SQLException e) {
throw new TransactionException("Failed to rollback transaction", e);
} finally {
restoreAutoCommitState(handle);
}
}
@Override
public void savepoint(Handle handle, String name) {
@SuppressWarnings("PMD.CloseResource")
final Connection conn = handle.getConnection();
try {
final Savepoint savepoint = conn.setSavepoint(name);
savepoints.put(name, savepoint);
} catch (SQLException e) {
throw new TransactionException(String.format("Unable to create savepoint '%s'", name), e);
}
}
@Override
public void releaseSavepoint(Handle handle, String name) {
@SuppressWarnings("PMD.CloseResource")
final Connection conn = handle.getConnection();
try {
final Savepoint savepoint = savepoints.remove(name);
if (savepoint == null) {
throw new TransactionException(String.format("Attempt to release non-existent savepoint, '%s'",
name));
}
conn.releaseSavepoint(savepoint);
} catch (SQLException e) {
throw new TransactionException(String.format("Unable to create savepoint %s", name), e);
}
}
@Override
public void rollbackToSavepoint(Handle handle, String name) {
@SuppressWarnings("PMD.CloseResource")
final Connection conn = handle.getConnection();
try {
final Savepoint savepoint = savepoints.remove(name);
if (savepoint == null) {
throw new TransactionException(String.format("Attempt to rollback to non-existent savepoint, '%s'",
name));
}
conn.rollback(savepoint);
} catch (SQLException e) {
throw new TransactionException(String.format("Unable to create savepoint %s", name), e);
}
}
@Override
public boolean isInTransaction(Handle handle) {
try {
return !handle.getConnection().getAutoCommit();
} catch (SQLException e) {
throw new TransactionException("Failed to test for transaction status", e);
}
}
@Override
public <R, X extends Exception> R inTransaction(Handle handle,
HandleCallback<R, X> callback) throws X {
if (isInTransaction(handle)) {
throw new IllegalStateException("Already in transaction");
}
didTxnRollback = false;
final R returnValue;
try {
handle.begin();
returnValue = callback.withHandle(handle);
if (!didTxnRollback) {
handle.commit();
}
} catch (Throwable e) {
try {
handle.rollback();
} catch (Exception rollback) {
e.addSuppressed(rollback);
}
throw e;
} finally {
didTxnRollback = false;
}
return returnValue;
}
@Override
public <R, X extends Exception> R inTransaction(Handle handle,
TransactionIsolationLevel level,
HandleCallback<R, X> callback) throws X {
final TransactionIsolationLevel initial = handle.getTransactionIsolationLevel();
try {
handle.setTransactionIsolation(level);
return inTransaction(handle, callback);
} finally {
handle.setTransactionIsolation(initial);
}
}
private void restoreAutoCommitState(Handle handle) {
try {
if (initialAutocommit) {
handle.getConnection().setAutoCommit(initialAutocommit);
savepoints.clear();
didBegin = false;
}
} catch (SQLException e) {
throw new UnableToRestoreAutoCommitStateException(e);
}
}
}
}