platform_hardware_interfaces/tests/foo/1.0/IFooCallback.hal

/*
 * Copyright (C) 2016 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 android.hardware.tests.foo@1.0;

//import IFoo;

interface IFooCallback {
    //heyItsMe(IFoo cb);
    heyItsYou(IFooCallback cb);
    heyItsYouIsntIt(IFooCallback cb) generates (bool yesOrNo);
    oneway heyItsTheMeaningOfLife(uint8_t tmol);

    // The next two methods are for instrumentation purposes.

    // Block the caller for up to ns nanosesonds and return the number
    // of nanoseconds it took to invoke each of the three methods
    // above, both from the point of view of the caller (callerBlockedNs) and
    // from the point of view of IFooCallback itself (timeNs).  timeNs measures
    // how long a method's body took to execute, regardless of whether the
    // method was oneway or two-way.  callerBlockedNs reflects the amount of
    // time the caller was blocked before the method returned.  For two-way
    // methods, callerBlockedNs should be slightly higher than timeNs.  For
    // one-way calls, callerBlockedNs will be very low, and unrelated to
    // timeNs.

    struct InvokeInfo {
        bool invoked;
	int64_t callerBlockedNs;
	int64_t timeNs;
    };
    reportResults(int64_t ns) generates (int64_t leftNs, InvokeInfo[3] invokeInfo);

    // This method is used by the caller of IFooCallback to tell IFooCallback
    // how long the three methods above took, from the point of view of that
    // caller.  IFooCallback adds this information to the one reported by
    // reportResults in InvokeInfo.

    youBlockedMeFor(int64_t[3] callerBlockedInfo);
};