Question

我想在执行完成后在executeTransactionAsync中关闭我的Realm实例。原因是我的应用程序主线程一直在冻结，我认为它的原因是后台域实例在执行完成后没有被关闭。请参阅下面的代码：

realm.executeTransactionAsync(new Realm.Transaction() {
                    @Override
                    public void execute(Realm realm) {
                        // Execute realm code
                        realm.copyToRealmOrUpdate(myData);
                        // Can I close the realm instance here without getting an 
                        // error? realm.close(); causes an error.
                    }
                }, new Realm.Transaction.OnSuccess() {
                    @Override
                    public void onSuccess() {
                        Log.i("CB", "success");
                        // looks like I cannot access the execute Realm 
                        // instance here.
                        // Closing realm.getDefaultInstance does not change my issue
                    }
                }, new Realm.Transaction.OnError() {
                    @Override
                    public void onError(Throwable error) {
                        Log.i("CB", "error - " + error.getMessage());
                    }
                });
            }

请参阅我的评论。我的应用程序屏幕变黑了。执行成功完成并调用onSuccess()，但我无法访问execute域实例以从此处关闭它。

您对我可以尝试的内容有什么建议吗？我做错了吗？

提前谢谢。

修改

07-19 11:43:42.379 8146-8146/com.shortterminsurance.shortterm I/CB: success
07-19 11:43:43.258 8146-8152/com.shortterminsurance.shortterm W/art: Suspending all threads took: 33.234ms
07-19 11:43:43.266 8146-8156/com.shortterminsurance.shortterm I/art: Background partial concurrent mark sweep GC freed 476307(17MB) AllocSpace objects, 512(10MB) LOS objects, 40% free, 33MB/55MB, paused 7.261ms total 163.497ms
07-19 11:43:44.131 8146-8156/com.shortterminsurance.shortterm I/art: Background sticky concurrent mark sweep GC freed 408160(9MB) AllocSpace objects, 459(15MB) LOS objects, 35% free, 35MB/55MB, paused 10.287ms total 147.823ms
07-19 11:43:44.834 8146-8152/com.shortterminsurance.shortterm W/art: Suspending all threads took: 103.676ms
07-19 11:43:44.848 8146-8156/com.shortterminsurance.shortterm W/art: Suspending all threads took: 13.424ms

这是我的onSuccess被调用后的logcat。我认为execute中的域的后台实例由于某种原因而继续运行：（。

Answer 1

此处传递的领域实例

@Override
public void execute(Realm realm) {

对您关闭。你不必担心自己关闭它。

如果检查Realm.executeTransactionAsync（）的源代码，则可以找到

bgRealm.beginTransaction();
try {
    transaction.execute(bgRealm);

    if (!Thread.currentThread().isInterrupted()) {
        bgRealm.commitTransaction(false, new Runnable() {
            @Override
            public void run() {
                // The bgRealm needs to be closed before post event to caller's handler to avoid
                // concurrency problem. eg.: User wants to delete Realm in the callbacks.
                // This will close Realm before sending REALM_CHANGED.
                bgRealm.close();
            }
        });
        transactionCommitted = true;
    }
}
...

首先，它会在您的事务上调用.execute()，然后关闭它传递给您的域实例。

Answer 2

这是一种可能性：

            final Realm realm = Realm.getDefaultInstance();
            realm.executeTransactionAsync(new Realm.Transaction() {
                @Override
                public void execute(Realm realm) {
                    // Execute realm code
                    realm.copyToRealmOrUpdate(myData);
                }
            }, new Realm.Transaction.OnSuccess() {
                @Override
                public void onSuccess() {
                    Log.i("CB", "success");
                    realm.close();
                }
            }, new Realm.Transaction.OnError() {
                @Override
                public void onError(Throwable error) {
                    Log.i("CB", "error - " + error.getMessage());
                    realm.close();
                }
            });
        }

虽然后台领域实例会自动关闭。

Answer 3

正如Tim Castelijns所说，executeTransactionAsync已经关闭了领域，无论如何，不关闭领域的实例不会导致UI阻塞，但是如果你试图打开一个Realm实例会引发异常，所以你应该有另一个问题

Answer 4

final Realm realmFirstInstance = Realm.getDefaultInstance();
realmFirstInstance.executeTransactionAsync(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                // Execute realm code
                realm.copyToRealmOrUpdate(myData);
            }
        }, new Realm.Transaction.OnSuccess() {
            @Override
            public void onSuccess() {
                Log.i("CB", "success");
                realmFirstInstance.close();
            }
        }, new Realm.Transaction.OnError() {
            @Override
            public void onError(Throwable error) {
                Log.i("CB", "error - " + error.getMessage());
                realmFirstInstance.close();
            }
        });
    }

此外，为了更清晰地理解：不要忘记关闭第一个领域实例。因为在这里execute（）方法中的“ realmFirstInstance”和“ realm”是两个不同的对象。

执行完成后关闭Realm实例

4 个答案: