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Parallel programming on the go
/**
* 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.gh.bmd.jrt.android.v4.routine;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import com.gh.bmd.jrt.android.builder.AndroidChannelBuilder;
import com.gh.bmd.jrt.android.builder.AndroidRoutineBuilder;
import com.gh.bmd.jrt.android.invocation.AndroidInvocation;
import com.gh.bmd.jrt.common.ClassToken;
import javax.annotation.Nonnull;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
/**
* This utility class extends the base Java routine in order to support additional routine builders
* specific to the Android platform.
* Routine invocations created through the returned builders can be safely restored after a change
* in the configuration, so to avoid duplicated calls and memory leaks. Be aware, though, that the
* invocation results will always be dispatched in the main thread, no matter the calling one was,
* so that waiting for the outputs right after the routine invocation will result in a deadlock.
*
* Note that the equals() and hashCode() methods of the input parameter
* objects might be employed to check for clashing of invocations or compute the invocation ID.
* In case the caller cannot guarantee the correct behavior of the aforementioned method
* implementations, a user defined ID or an input independent clash resolution should be used to
* avoid unexpected results.
*
* The routine invocations will be identified by an ID number. In case a clash is detected, that is,
* an already running invocation with the same ID exists at the time the new invocation is executed,
* the clash is resolved based on the strategy specified through the builder. When a clash cannot be
* resolved, for example when invocations with different implementations share the same ID, the new
* invocation is aborted with a {@link com.gh.bmd.jrt.android.builder.InvocationClashException}.
*
* For example, in order to get a resource from the network, needed to fill an activity UI:
*
*
*
* @Override
* protected void onCreate(final Bundle savedInstanceState) {
*
* super.onCreate(savedInstanceState);
* setContentView(R.layout.my_activity_layout);
*
* if (savedInstanceState != null) {
*
* mResource = savedInstanceState.getParcelable(RESOURCE_KEY);
* }
*
* if (mResource != null) {
*
* displayResource(mResource);
*
* } else {
*
* final Routine<URI, MyResource> routine =
* JRoutine.onActivity(this, ClassToken.tokenOf(LoadResource.class))
* .buildRoutine();
* routine.callAsync(RESOURCE_URI)
* .bind(new TemplateOutputConsumer<MyResource>() {
*
* @Override
* public void onError(@Nullable final Throwable error) {
*
* displayError(error);
* }
*
* @Override
* public void onOutput(final MyResource resource) {
*
* mResource = resource;
* displayResource(resource);
* }
* });
* }
* }
*
* @Override
* protected void onSaveInstanceState(final Bundle outState) {
*
* super.onSaveInstanceState(outState);
* outState.putParcelable(RESOURCE_KEY, mResource);
* }
*
*
* The above code will ensure that the loading process survives any configuration change and the
* resulting resource is dispatched only once.
*
* Note that the invocation may be implemented so to run in a separate service:
*
*
*
* public class LoadResource extends AndroidTemplateInvocation<URI, MyResource> {
*
* private Routine<URI, MyResource> mRoutine;
*
* @Override
* public void onContext(@Nonnull final Context context) {
*
* super.onContext(context);
*
* mRoutine = JRoutine.onService(context, ClassToken.tokenOf(LoadResourceUri.class))
* .buildRoutine();
* }
*
* @Override
* public void onInput(final URI uri,
* @Nonnull final ResultChannel<MyResource> result) {
*
* result.pass(mRoutine.callAsync(uri));
* }
* }
*
*
*
* Created by davide on 12/8/14.
*/
@SuppressFBWarnings(value = "NM_SAME_SIMPLE_NAME_AS_SUPERCLASS",
justification = "utility class extending functionalities of another utility "
+ "class")
public class JRoutine extends com.gh.bmd.jrt.android.routine.JRoutine {
/**
* Returns a builder of routines bound to the specified activity.
* Note that the specified invocation class must be static and have a default constructor.
* Note that also the built routine results will be always dispatched in the main UI thread,
* thus waiting for the outputs immediately after its invocation in the main thread will result
* in a deadlock.
*
* @param activity the activity instance.
* @param classToken the invocation class token.
* @param the input data type.
* @param