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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.android.dialer.calllog.datasources;
import android.content.ContentValues;
import android.support.annotation.MainThread;
import android.support.annotation.WorkerThread;
import com.android.dialer.calllog.database.contract.AnnotatedCallLogContract;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
/**
* A source of data for one or more columns in the annotated call log.
*
* <p>Data sources have three lifecycle operations, which are always called on the same thread and
* in the same order for a particular "checkDirtyAndRebuild" cycle. However, not all operations are
* always invoked.
*
* <ol>
* <li>{@link #isDirty()}: Invoked only if the framework doesn't yet know if a rebuild is
* necessary.
* <li>{@link #fill(CallLogMutations)}: Invoked only if the framework determined a rebuild is
* necessary.
* <li>{@link #onSuccessfulFill()}: Invoked if and only if fill was previously called and the
* mutations provided by the previous fill operation succeeded in being applied.
* </ol>
*
* <p>Because {@link #isDirty()} is not always invoked, {@link #fill(CallLogMutations)} shouldn't
* rely on any state saved during {@link #isDirty()}. It <em>is</em> safe to assume that {@link
* #onSuccessfulFill()} refers to the previous fill operation.
*
* <p>The same data source objects may be reused across multiple checkDirtyAndRebuild cycles, so
* implementors should take care to clear any internal state at the start of a new cycle.
*
* <p>{@link #coalesce(List)} may be called from any worker thread at any time.
*/
public interface CallLogDataSource {
/**
* A lightweight check which runs frequently to detect if the annotated call log is out of date
* with respect to this data source.
*
* <p>This is typically used to detect external changes to the underlying data source which have
* been made in such a way that the dialer application was not notified.
*
* <p>Most implementations of this method will rely on some sort of last modified timestamp. If it
* is impossible for a data source to be modified without the dialer application being notified,
* this method may immediately return false.
*
* @see CallLogDataSource class doc for complete lifecyle information
*/
ListenableFuture<Boolean> isDirty();
/**
* Computes the set of mutations necessary to update the annotated call log with respect to this
* data source.
*
* @see CallLogDataSource class doc for complete lifecyle information
* @param mutations the set of mutations which this method should contribute to. Note that it may
* contain inserts from the system call log, and these inserts should be modified by each data
* source.
*/
ListenableFuture<Void> fill(CallLogMutations mutations);
/**
* Called after database mutations have been applied to all data sources. This is useful for
* saving state such as the timestamp of the last row processed in an underlying database. Note
* that all mutations across all data sources are applied in a single transaction.
*
* @see CallLogDataSource class doc for complete lifecyle information
*/
ListenableFuture<Void> onSuccessfulFill();
/**
* Combines raw annotated call log rows into a single coalesced row.
*
* <p>May be called by any worker thread at any time so implementations should take care to be
* threadsafe. (Ideally no state should be required to implement this.)
*
* @param individualRowsSortedByTimestampDesc group of fully populated rows from {@link
* AnnotatedCallLogContract.AnnotatedCallLog} which need to be combined for display purposes.
* This method should not modify this list.
* @return a partial {@link AnnotatedCallLogContract.CoalescedAnnotatedCallLog} row containing
* only columns which this data source is responsible for, which is the result of aggregating
* {@code individualRowsSortedByTimestampDesc}.
*/
@WorkerThread
ContentValues coalesce(List<ContentValues> individualRowsSortedByTimestampDesc);
@MainThread
void registerContentObservers();
@MainThread
void unregisterContentObservers();
/**
* Clear any data written by this data source. This is called when the new call log framework has
* been disabled (because for example there was a problem with it).
*/
@MainThread
ListenableFuture<Void> clearData();
/**
* The name of this daa source for logging purposes. This is generally the same as the class name
* (but should not use methods from {@link Class} because the class names are generally obfuscated
* by Proguard.
*/
String getLoggingName();
}
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